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`U8006287167131
`
`(12) United States Patent
`US 6,237,167 B1
`(10) Patent No.:
`Kondo
`(45) Date of Patent:
`Sep. 11, 2001
`
`(54) DRIVING CIRCUIT FOR TOY CAR
`
`(75)
`
`Inventor: Hirotoshi Kondu, Tokyo (JP)
`
`(73) Amignee: Kondo kagaku Co., Ltd., 'Ibkyo (J 1’)
`
`( ‘) Notice:
`
`Subject to any disclaimer, the [em 01' this
`patent
`is. extended or adjusted under 35
`U.S.(.‘. 1540)) by [l clays.
`
`3305.387 "' 12.110112 Stern ct ill.
`446;"454 X
`4.1155111602 *
`351978 l-lullori et al.
`446E454 X
`4,143.30? 3
`3.31979 Hansen el :11.
`..... 446;“454 X
`
`4,2?5394 *
`61111181 Mahuchi et ul.
`.
`. 440.1456 X
`4,349,986 *
`0,11982 'l'sukudn
`..... 446F484
`
`..... 44!J.-’454X
`4548,3384 ‘ 10:198.”? Townsend
`
`...................... 440E454 X
`4.1111184 * 13198? Ilaugcrud
`
`* cited by examiner
`
`(21) Appl. No; 091370304
`
`(22)
`
`l-‘iled:
`
`Aug. 9, 1999
`
`Primary Exmuiner—l). Neal Muir
`(74) Attorney, Agent, or Finn—Dilworlh & Barrese LLP.
`
`(30)
`
`Foreign Application Priority Data
`
`(57)
`
`ABS‘I‘RAC'I‘
`
`Aug. to, 1993
`
`(JP) .............................................. III-236593
`
` (SI) Int. Cl.7 ...... .. A63H 30ft)“; A6311 30,404
`
`
`(52) US. Cl.
`.......................... 4461454; 446,450; 4461484;
`463;“62
`
`(58) Field of Search ..................................... 4465454, 456.
`4461457, 461, 462. 484; 46345, 62
`
`The invention relates to a speed controller able to change a
`pulse frequency and a pulse width of a pulse signal to control
`a driving motor. This device is able to change the pulse
`frequency during the run of the toy car which adjusts the
`torque of the driving motor in response to the revolution
`number of the driving motor. ‘lhe speed controller adjusts
`the pulse frequency to he large when the pulse width is
`small. while the pulse frequency is small when the pulse
`width is large.
`
`21] Claims, 6 Drawing Sheets
`
`1
`
`Mattel Ex. 2004
`Mattel Ex. 2004
`Dynacraft v. Mattel
`Dynacraft v. Mattel
`|PR2018-00039
`IPR2018-00039
`
`(56)
`
`3.569.909 *
`
`References Cited
`U.S. PATENT DOCUMENTS
`
`
`3H9?! Lemon. .lr.
`
`.....
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`........... 44m45o X
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`|3111/11)
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`Pwl
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`P4
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`P8
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`

`

`US. Patent
`
`Sep. 11, 2001
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`Sheet 1 0f 6
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`US 6,287,167 B1
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`1
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`/|/ 20
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`200
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`b-
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`2
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`US. Patent
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`Sep. 11, 2001
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`Sheet 2 0f 6
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`US 6,287,167 B1
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`3
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`US. Patent
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`Sep. 11, 2001
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`Sheet 3 0f 6
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`US 6,287,167 B1
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`PULSE
`
`FREQUENCY
`
` P10 --
`
`P1
`
`r1
`
`THROTTLE OPEN DEGREE
`
`FIG. 4
`
`T10
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`TORQUE
`
`THROTTLE OPEN DEGREE
`
`FIG. 5
`
`4
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`

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`US. Patent
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`Sep. 11, 2001
`
`Sheet 4 0f 6
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`US 6,287,167 B1
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`STEP 1
`
`STEP 2
`
`
`
`WHETHER INPUTS DATA
`
`
`
`
`
`REWRITES OATA
`
`STEP 3
`
`-
`
`INSTRUCTION INPUT
`OF REVOLUTION NUMBER
`
`STEP 4
`
`--
`
`PULSE FREQUENCY SETTING
`
`FROM DATA IN CPU
`
`STEP 5
`
`.
`
`PULSE WIDTH SEITING
`
`STEP 6
`
`OUTPUTTING PULSE SIGNAL
`
`STEP 7
`
`-
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`DRIVING MOTOR
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`ROTATION
`
`FIG. 6
`
`5
`
`

`

`US. Patent
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`Sep. 11, 2001
`
`Sheet 5 0f 6
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`US 6,287,167 B1
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`P(1/f)
`
`|
`PP“!
`(PRIOR ART) W—
`
`FIG. 7a,
`
`|||llIIIII ’
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`Pw’
`m 76m(PRIOR ART)
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`6
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`

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`US. Patent
`
`Sep. 11, 2001
`
`Sheet 6 Of 6
`
`US 6,287,167 B1
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`P
`
`PULSE
`
`FREQUENCY
`
`
`
`SMALL
`
`
`
`LARGE
`
`THROTTLE OPEN DEGREE
`
`I3I13.
`
`:8
`
`(PRIOR ART)
`
`T
`
`TORQUE
`
`SMALL
`
`
`
`LARGE
`
`THROTTLE OPEN DEGREE
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`IEICJ.
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`£9
`
`(PWOR ARU
`
`7
`
`

`

`US 6,287,167 B1
`
`1
`DRIVING CIRCUIT FOR TOY CAR
`
`BACKGROUND OF THE INVENTION
`
`1. Field of the Invention
`
`This invention relates to a driving circuit for toy car, and
`more particularly a drive circuit to control a driving motor
`based on a throttle open signal from a transmitter.
`2. Description of the Prior Art
`When the toy car is run by a remote control operation in
`a circuit, an operator should control a car speed of the toy car
`in response to a curved course andfor a straight course.
`When the car speed is controlled, a throttle open degree
`control [ever of a transmitter is operated to change a revo-
`lution number of the driving motor mounted on the toy car.
`It is requested to change a pulse width of a pulse signal
`which drives the driving motor.
`For example, when the car speed is lowered when the toy
`car curves, a pulse width PW of the pulse signal is lessened,
`as shown in F IG. 7(a) thereby lowering the revolution
`number of the driving motor. On the other hand, when the
`speed of the car is raised to run the straight course, its pulse
`width PW of the pulse signal, as shown in FIG. 7(b} is
`enlarged, to raise the revolution number of the driving motor
`time, a pulse frequency I’(1lf frequency} of the pulse signal
`is not changed but kept constant.
`To this end, each circuit on which the toy car runs, a
`course lay-out and size of a course vary, and construction of
`the toy car body varies.
`For example,
`there are often opportunities to use the
`driving motor ot'whecls. at a low speed revolution, thereby
`raising a torque at a low speed revolution high. to be able to
`run the curve course forcibly.
`there are often
`In a straight course with less curves,
`opportunities to use the driving motor of the wheels at high
`speed; it is required to smoothly rotate the motor to raise a
`revolution efficiency of the motor at high.
`For this reason, when the toy car is run on a curved course,
`the pulse frequency tJ of the pulse signal to drive the driving
`motor is preset at high (see solid line gl in FIG. 8) to raise
`torque at a low speed revolution (see solid line g1 in FIG. 9).
`On the other hand, for relatively straight course with few
`curves for the car drive, the pulse frequency P of the pulse
`signal to drive the driving motor is preset low. prior to a run
`of the ear (see dotted line g2 in FIG. 8 graph), to smoothly
`rotate the motor, to raise revolution elliciency (see dotted
`line g2 in FIG. 9 graph}.
`Thus, the driving circuit in the prior art is pre-changed at
`its pulse frequency to meet the course. When the car is run
`on the curved course, for example, it is difficult to attain high
`revolution efficiency with smooth revolution of the motor,
`on the straight course.
`On the other hand, when the car is run on the straight
`course. it is diflicult to raise the torque on the curved course.
`
`SUMMARY OF THE INVENTION
`
`This invention provides a driving circuit for the toy car to
`enable raising the driving motor torque for runs on a curved
`course to achieve a forceful run, while on the run on the
`straight course, the driving motor is smoothly rotated to raise
`the efficiency of revolution. Thus, all the drawbacks in the
`prior art are overcome. To achieve said object of this
`invention, it has a speed controller in the drive circuit to
`control the revolution number of the driving motor on the
`toy car for run ofthe toy car, said speed controller being able
`
`in
`
`15
`
`*
`
`3o
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`2
`to change the pulse frequency and the pulse width of the
`pulse signal to control the driving motor.
`The above driving circuit of this invention has a speed
`controller by which the pulse frequency and the pulse width
`of the pulse signal are changed.
`Thus,
`this invention achieves a change of the pulse
`frequency driving a run of the toy car. Then, the torque of the
`driving motor is adjustable in response to the revolution
`number of the driving motor and the smooth rotation of the
`driving motor in response to the revolution number of the
`driving motor is achieved. In a preferred embodiment the
`speed controller enlarges the pulse frequency when the pulse
`width is lowered, while lowering the pulse frequency when
`the pulse width is enlarged.
`While at a low speed revolution of the driving motor, and
`the pulse frequency of the pulse signal is enlarged, and the
`pulse frequency of the pulse signal
`is lowered when the
`driving motor rotates at a high speed. For this reason, as the
`driving motor torque can be enlarged when the toy car is run
`on a curved course, the toy car can be forcefully run on a
`curved course. To the contrary, when running on the straight
`course. the driving motor is smoothly rotated, so that the
`revolution elliciency of the driving motor is raised.
`
`BRIEF DESCRIPTION OF THE
`ACCOMPANYING DRAWINGS
`
`FIG. 1 is a general view showing a toy car unit operated
`by remote control. of this invention;
`FIG. 2 is a block diagram showing a control means ofthe
`toy car of this invention;
`FIG. 3 is a explanatory view of the pulse signal, trans—
`mitted to the driving motor from a speed controller, of this
`invention;
`FIG. 4 is a graph showing a relation of a throttle open
`degree and a pulse frequency, of this invention;
`FIG. Sis a graph showing a relation of the throttle open
`degree and torque, of this invention;
`FIG. 6 is a flow chart explaining function of the driving
`circuit, of this invention;
`FIG. 7 is an explanatory view of the pulse signal trans-
`mitted to a prior art driving motor;
`FIG. 8 is a gaph showing a relation of throttle open
`degree and pulse frequency, of the prior art; and
`FIG. 9 is a graph showing a relation of the throttle open
`degree and the torque, of the prior art.
`
`DESCRIPTION OF THE PREFERRED
`EMBODlMENTS
`
`Now, the preferred embodiments of this invention will be
`hereinafter discussed with reference to the accompanying
`drawings.
`FIG. I is a general view showing a toy car unit for remote
`operation of this invention. FIG. 2 is a block diagram
`showing a control means of the toy car of this invention.
`FIG. 3 is an explanatory view of a pulse signal transmitted
`to a driving motor from a speed controller of this invention.
`FIG. 4 is a graph showing a relation of a throttle open degree
`and a pulse frequency of this invention. FIG. 5 is a graph
`showing a throttle open degree and a torque of this inven-
`tion. FIG. 6 is a flow chan explaining a function ofa driving
`circuit of the toy car of this invention. As shown in FIG. 1.
`the toy car unit 1 for the remote operation comprises a main
`body 5 in a toy car shape having front wheels 2 and rear
`wheels 3, a control means 10 driving the rear wheels 3 of the
`
`8
`
`

`

`US 6,287,167 B1
`
`3
`main body 5, and a transmitter 20 to transmit a running
`signal to the control means 10.
`Numeral 20a is a control lever to adjust the throttle open
`degree at the transmitter 20.
`As shown in FIG. 2, the control means 10 comprises a
`receiver 12 to receive a running signal from the transmitter
`20, a driving circuit 14 to a feed speed control signal based
`on the running signal receiver at the receiver 12, a driving
`motor 16 driven by a pulse signal (speed control signal) from
`this driving circuit 14, and a gear member 18 to transmit a
`revolutionary force of the driving motor 16 to the rear
`wheels 3. Numeral 22 is a power source. Now, the speed
`controller .15 is explained based on Table I. The driving
`circuit 14 has the speed controller 15 in which data shown
`in the Table 1 has been input. This data is set in 10 steps of
`the frequency in fl—flt] of the pulse signal (speed control
`signal)
`to control
`the driving motor 16, with setting a
`revolution number (the throttle open degree of the control
`lever) ofthe driving motor 16 and matching to the revolution
`number rl—rll] of the driving motor 16.
`in fl:300 Hz,
`For example,
`those frequencies are set
`f2:400 Hz, [3:500 Hz, E41600 Hz, f5z700 Hz, [6:800 Hz,
`f7:900 Hz. 98:1 KHz, t9:1.5 KHz and f10:2 KHz.
`When frequency is set at
`the frequency [1(300 Hz), a
`pulse width pwl
`is adjustably set at 0-—10% of the pulse
`frequency pl (lt‘fl). When the frequency I! (400 Hz) is set,
`the pulse width pw2 is adjustably set at 10—20% ofthe pulse
`Frequency (1112); when frequency is set at the frequency 13
`(500 Hz), the pulse width pw3 is adjustably set at 20—30%
`of the pulse frequency p3 (HES).
`the frequency
`Additionally, when frequency is set at
`[4(600112), the pulse width pw4 is adjustably set at 30—40%
`of the pulse frequency 4(1tf4), and when frequency is set at
`the frequency f5 (700 Hz), the pulse width pr is adjustahlyr
`set at 40—50% of the pulse frequency 135 (MS). When
`frequency is set at the frequency [6 {800 Hz), the pulse width
`pwfi is adjustably set at 50—60% of the pulse frequency p6
`(ttf6). When frequency is set at the frequency [7 (900 Hz),
`the pulse width pw7 is adjustably set at 60—70% of the pulse
`frequency p7 {1117}, and when frequency is set at
`the
`frequency f8 (1 KHZ), the pulse width pw8 is adjustably set
`at 70—80% of the puLse frequency pl (ll'fB).
`Additionally, when frequency is set at the frequency f9
`(1.5 KHZ), the pulse width prl is adjustably set at 80—90%
`of the pulse frequency and when frequency is set at
`the
`t'requency ['10 (2 K112), the pulse width pwlfl is adjustably
`set at Gil—100% of the pulse frequency p10 (llflfl).
`FIG. 3(a) shows the pulse frequency pl (li‘fl) and the
`pulse width pwl, when the frequency is set at f1 (300 Hz).
`Here, as the pulse frequency pl is large while the pulse
`width pwl is small. the driving motor 16 is able to retain
`high torque at low speed.
`t-‘IG. 3(b) shows the pulse fre-
`quency p4 (1tf4) and the pulse width pw4 when the he
`quency is set at f4 (600 112). Here, as the pulse frequency p1
`is medium while the pulse width pwl is also medium, the
`driving motor 16 is medium speed.
`FIG. 3(c) shows the pulse frequency p8 (1/18 and the
`pulse width pw8, when the frequency is set at PS (1 KB?)
`Here,
`the driving motor 16 is at high speed and rotates
`etficiently, as the pulse frequency pl is small while the pulse
`width pr is large. FIG. 4 shows a relation of the pulse
`frequency (1—10) based on the data in the Table l and
`revolution number of the driving motor, which is the throttle
`open degree (rl—rltl) of the throttle lever. The pulse fre-
`quency (p 1—10) is shown at a vertical axis and the throttle
`open degree (rt-r10) at abscissa.
`
`ll]
`
`15
`
`3t:
`
`35
`
`4t]
`
`45
`
`50
`
`55
`
`60
`
`55
`
`4
`In FIG. 4, a solid line g3 shows a relation of the pulse
`frequency and the throttle open degree, of this invention,
`while a dotted line g4 shows a pulse frequency and a throttle
`open degree, of the prior art.
`The solid line g3 shows that the pulse frequency pl—10
`changes in response to the throttle open degree rl—rlo. In
`other words, when the throttle open degree becomes small
`from r10 to r1, the pulse frequency becomes large from pl
`to p10.
`On the other hand, when the throttle open degree becomes
`large from r1 to r10, the pulse frequency becomes small
`from p10 to pl. In the prior art,
`the pulse frequency is
`constant with no change, even when the throttle open degree
`changes from rl—rlfl.
`FIG. 5 shows a relation of the torque (T1—110) of the
`driving motor and the revolution number of the driving
`motor which is the throttle open degree (rl—rlll) of the
`throttle lever, based on the data in the Table I.
`Ilere, the torque (Tl—TITO) is shown in a vertical axis and
`the throttle open degree (r I—rlfl) on an abscissa. In FIG. 5,
`the solid line g3 shows the torque curve of this invention,
`while the dotted line g4 shows the torque curve in the prior
`art.
`
`As shown in FIG. 4, as. the throttle open degree becomes
`small from r10—r1, the pulse frequency becomes large from
`p] to pll], the torque T1 becomes higher than conventional
`torque, when the throttle open degree is, for example, small,
`for example at r1.
`0n the other hand, when the throttle open degree becomes
`large from r1 to r10, the pulse frequency becomes small
`from p10 to pl. When the throttle open degree is large, for
`example at r10,
`the torque 10 becomes lower than the
`conventional torque, but
`is smoothly rotates the driving
`motor 16, to raise its revolution efficiency of the driving
`motor.
`
`Then inputting the data in the Table 1 into the speed
`controller 15 by the driving circuit 14, to run the toy car 5
`based on the data, the flow chart on 1:16. 6 is explained.
`In the step 1, we judge whether the data in the Table l is
`input or not into the speed controller 15. When the data in
`the Table 1 is input, an old data of the speed controller is
`rewritten to the data in the Table I (Step 2). On the other
`hand, when the data in the Table 1 is not input, the old data
`remaining in the speed controller 15. In this explanation, it
`is as if the data is rewritten in the data in the Table I.
`
`If the toy car 5 is caused to run in this state, the revolution
`number of the driving motor 16 is selected to change the car
`5 speed in the step 3, the selected revolution number being
`instructed from the transmitter 21] to the speed controller 15.
`In step 4, the pulse frequency is set in response to the input
`revolution number. based on the data in the Table 1 pro-input
`in the speed controller 15.
`in response to the
`In step 5,
`the pulse width is set
`revolution number. In step 6, the set pulse frequency and the
`pulse signal set at the pulse width is output from the speed
`controller 15 to the driving motor 16 which is in turn driven
`in step 't', to run the toy car 5 at a given car speed.
`For example, where the revolution number of the driving
`motor is at r1, the pulse frequency is at p1 as shown in the
`Table l, and the pulse width pw'l is set at a low speed run
`of 0—10% of the pulse frequency. Thus, as the pulse fre—
`quency of the pulse signal
`is settable at
`large value, the
`torque T1 of the driving motor at the low speed (revolution
`number r1) is settable as shown by the solid line g3 in the
`FIG. 5. Where the revolution number ofthe driving motor is
`
`9
`
`

`

`US 6,287,167 B1
`
`5
`set at r4, the pulse frequency is at p4, as shown in the Table
`I, the pulse width pw4 is set at medium speed run of
`40—50% of the pulse frequency.
`Furthermore, where the revolution number is at III], the
`pulse frequency is set at pH], as shown in the Table l, and
`the pulse width prO is set at a high speed run of (JO—100%
`of the pulse frequency.
`Thus, as the pulse frequency is settable low, the driving
`motor 16 is smoothly rotated at
`the high speed run
`(revolution number r10), as shown by the solid line g3 in
`FIG. 5, to raise the revolution efficiency.
`In the embodiment aforementioned, although the data in
`the Table 1 (when the throttle open degree become small, the
`pulse frequency becomes large, while when the throttle open
`degree become large, the pulse frequency becomes small), is
`input into the speed controller 15, it is possible to input the
`data reverse to the relation of the throttle open degree and
`the pulse frequency. In the case where the data in the Table
`1
`is pre-input into the speed controller 15, new data is
`inputtable from a keyboard, during the running of the toy car
`5.
`
`As above, the invention provides a speed controller by
`which the pulse frequency and the pulse width of the pulse
`signal are changeable, so that the pulse frequency is change-
`able during the car running. Therefore, the torque of the
`driving motor is adjustable in response to the revolution
`number of the driving motor, while the driving motor is
`smoothly rotatable in response to the revolution number of
`the driving motor. Thus, the car runs in response to the states
`of the course.
`What is claimed is:
`1. Adriving circuit of the toy car to run with a control of
`a revolution number of a DC. driving motor mounted on the
`toy car main body wherein said driving circuit has a speed
`controller being able to change a pulse frequency and a pulse
`width of the pulse signal controlling the driving motor.
`2. A driving circuit of the toy car according to claim 1,
`wherein said speed controller is designed so that its pulse
`frequency is enlarged when the pulse width is decreased and
`the pulse frequency is decreased when the pulse width is
`enlarged.
`3. A driving circuit according to claim 2, wherein said
`speed controller
`is designed such that at
`a
`low speed
`revolution of the driving motor, the pulse frequency of the
`pulse signal is enlarged, and
`the pulse frequency of the pulse signal is lowered when
`the driving motor rotates at a high speed.
`4. A driving circuit according to claim 3, wherein the toy
`car comprises a main body having front wheels and rear
`wheels. control means for driving the rear wheels of the
`main body, and
`running
`a
`a separate transmitter arranged to transmit
`signal to the control means and comprising a control
`lever for adjusting throttle open degree at the transmit-
`ter.
`
`5. A driving circuit according to claim 4, wherein said
`control means comprise a receiver to receive the signal from
`the transmitter, a driving circuit arranged to feed a speed
`control signal based upon the signal received from the
`receiver.
`the driving motor arranged to be driven by the pulse signal
`(speed control signal) from the driving circuit, and
`a gear member arranged to transmit revolutionary force
`from the driving motor to the rear wheels.
`6. A driving circuit according to claim 3, wherein said
`speed controller comprises a receiver to receive a waning
`
`ll]
`
`15
`
`an
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`6
`signal from a transmitter, a driving circuit arranged to feed
`a speed control signal based upon the signal received from
`the receiver,
`the driving motor arranged to be driven by the pulse signal
`(speed control signal) from the driving circuit, and
`a gear member arranged to transmit revolutionary force
`from the driving motor to rear wheels.
`7. A driving circuit according to claim 2, wherein said
`speed controller comprises a receiver to receive a running
`signal from a transmitter, a driving eircu it arranged to feed
`a speed control signal based upon the signal received front
`the receiver,
`the driving motor arranged to be driven by the pulse signal
`(speed control signal) from the driving circuit, and
`a gear member arranged to transmit revolutionary force
`from the driving motor to rear wheels.
`8. A driving circuit according to claim I, wherein said
`speed controller comprises a receiver to receive a running
`signal from a transmitter, a driving circuit arranged to feed
`a speed control signal based upon the signal received from
`the receiver,
`the driving motor arranged to be driven by the pulse signal
`(speed control signal) from the driving circuit, and
`a gear member arranged to transmit revolutionary force
`from the driving motor to rear wheels.
`9. A driving circuit according to claim 8, wherein said
`speed controller comprises pulse width data input therein in
`ten steps of frequency of the pulse signal (speed control
`signal) for control ling the driving motor, with a revolution
`number (throttle open degree) of the driving motor being set
`to match the ten frequency steps.
`10. A driving circuit according to claim 7, wherein said
`speed controller comprises pulse width data input therein in
`ten steps of frequency of the pulse signal (speed control
`signal) for controlling the driving motor, with a revolution
`number (throttle open degree) of the driving motor being set
`to match the ten frequency steps.
`11. A driving circuit according to claim 6, wherein said
`speed controller comprises pulse width data input therein in
`ten steps of frequency of the pulse signal (speed control
`signal) for controlling the driving motor, with a revolution
`number (throttle open degree) of the driving motor being set
`to match the ten frequency steps.
`12. A driving circuit according to claim 5, wherein said
`control means comprise pulse width data input therein in ten
`steps of frequency of the pulse signal (speed control signal)
`for controlling the driving motor, with a revolution number
`(throttle open degree) of the driving motor being set to
`match the ten frequency steps.
`13. Adriving circuit according to claim 12, wherein in the
`ten steps of the pulse width data, a first step is set up to 10%
`of the pulse frequency, a second step from 10—20% of the
`pulse frequency, a third step from 20—30% of the pulse
`frequency, a
`fourth step from 30—40% of the pulse
`frequency, a fifth step from 40—50% of the pulse frequency,
`a sixth step from 50—60% of pulse frequency, a seventh step
`from 60—70% of the pulse frequency, an eighth step from
`70-80% of the pulse frequency, a ninth step from 80—90%
`0fthe pulse frequency and a tenth step from 90—10096 ofthe
`pulse frequency.
`14. Adriving circuit according to claim 11, wherein in the
`ten steps of the pulse width data, a first step is set up to 10%
`of the pulse frequency, a second step from 10—20% of the
`pulse frequency, a third step from 20—30% of the pulse
`frequency, a
`fourth step from 30—40% of the pulse
`frequency, a fifth step from 40—50% of the pulse frequency,
`
`10
`10
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`

`

`US 6,287,167 B1
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`7
`a sixth step from 50-60% of pulse frequency, a seventh step
`from 60—70% of the pulse frequency, an eighth step from
`70—80% of the pulse frequency, a ninth step from 80—90%
`ofthe pulse frequency and a tenth step from 90—100% of the
`pulse frequency.
`15. Adriving circuit according to claim 11, wherein in the
`ten steps of the pulse width data, a first step is set up to 10%
`of the pulse frequency, a second step from 10—20% of the
`pulse frequency, a third step from 20—30% of the pulse
`frequency, a fourth step from 30—40% of the pulse in
`frequency, a fifth step from 40—50% of the pulse frequency,
`a sixth step from 50—60% of pulse frequency, a seventh step
`from 60—70% of the pulse frequency. an eighth step from
`70—80% of the pulse frequency, a ninth step from 80—90%
`of the pulse frequency and a tenth step from 90—100% ofthe 15
`pulse frequency.
`16. A driving circuit according to claim 15, comprising a
`decreasing linear relationship between the pulse frequency
`and the throttle open degree, with the throttle open degree
`becoming smaller when the pulse frequency becomes larger an
`and vice versa.
`17. A driving circuit according to claim 9, comprising a
`decreasing linear relationship between the pulse frequency
`
`8
`and the throttle open degree, with the throttle open degree
`becoming smaller when the pulse frequency becomes larger
`and vice versa.
`18. A driving circuit according to claim 17, wherein the
`torque of the driving motor and revolution number or
`throttle open degree of the driving motor comprising a
`positive curvilinear
`relationship with each other
`that
`increases towards a limit of torque as the torque and throttle
`open degree both increase.
`19. A driving circuit according to claim 6, wherein the
`torque of the driving motor and revolution number or
`throttle open degree of the driving motor comprising a
`positive curvilinear relationship with one another
`that
`increases towards a limit of torque as the torque and throttle
`open degree both increase.
`20. A driving circuit according to claim 5, wherein the
`torque of the driving motor and revolution member or
`throttle open degree of the driving motor comprising a
`positive curvilinear relationship that increases towards a
`limit of torque as the torque and throttle open degree both
`increase.
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`11
`11
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