JP2019060288A - Electronic throttle drive device and engine controller comprising electronic throttle drive device - Google Patents

Abstract

To improve quietness in stopping an engine, and also improve startability of the engine.SOLUTION: An electronic throttle drive device is configured to: monitor a change period of a motor drive frequency after a power source is turned on; add a function of stopping a throttle motor 5A; further monitor and adjust throttle valve opening Tp in change of the motor drive frequency; and moreover control a starter motor 16, a fuel injector 8, an ignition coil 11A and a fuel pump 13 so as not to drive an engine until a frequency becomes a target frequency or until the throttle valve opening Tp becomes target opening.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electronic throttle drive device for driving an electronic throttle that controls the amount of intake air drawn into an engine, and an engine control device provided with the electronic throttle drive device, and more particularly to a throttle motor before engine start and at engine stop. The present invention relates to an electronic throttle drive device adapted to reduce drive noise and an engine control device equipped with the electronic throttle drive device.

  Generally, in an electronic throttle drive device used for an engine, an electronic throttle that controls a throttle valve that controls an intake air amount to the engine according to the condition of the engine by a motor driven by a duty control method (PWM control) A drive (throttle by wire: SBW) is being adopted. For example, Japanese Patent Laid-Open No. 2005-180327 (Patent Document 1) discloses an electronic throttle drive device for an engine for a motorcycle.

  However, in the conventional electronic throttle drive device, when the drive frequency (PWM drive frequency) of the motor for driving the electronic throttle is a relatively low frequency, an unpleasant motor drive noise such as "boom" is emitted, or the vehicle Depending on the situation, there are voices asking for reduction of the resonance sound due to the resonance frequency with other parts. Therefore, for example, as disclosed in JP-A-2003-49669 (Patent Document 2), the frequency of the duty control is variably set according to the operating state to ensure quietness, or JP-A-2003-49669. As disclosed in Japanese Patent Application Publication No. 2010-7513 (Patent Document 3), there has been proposed one that stops driving of a motor that drives an electronic throttle when the engine is stopped.

JP, 2005-180327, A JP 2003-49669 A JP, 2010-7513, A

  However, the electronic throttle drive disclosed in Patent Document 2 does not consider the change of the drive frequency before the start of the engine, and may cause unpleasant motor drive noise or other parts such as "boom" when the engine is stopped. Resonance noise can not be prevented. Further, when the high frequency state where the drive frequency exceeds the human audible frequency range continues, a load is placed on the drive element (for example, FET: field effect transistor) mounted in the drive circuit of the throttle motor, and the temperature of the drive element There is a risk of rising, worst and fire.

  Further, in the electronic throttle drive device disclosed in Patent Document 3, since the motor drive is stopped before starting the engine, the motor drive noise at the time of engine stop does not matter, but then, at the time of engine start, the starter motor Since the fuel pump, the injector, and the ignition coil start to operate, the power supply voltage becomes unstable, and it takes time for the throttle valve opening of the electronic throttle to shift from the closed state to the target opening, In some cases, the starting rotational speed of the engine may not smoothly increase (deteriorate), or the engine rotational speed may rapidly increase (danger).

  The present invention has been made to solve the above-mentioned problems in the conventional engine drive system, and improves the quietness when the engine is stopped and also improves the startability of the engine, It is an object of the present invention to provide an engine control device provided with the electronic throttle drive device.

An electronic throttle drive device according to the present invention is an electronic throttle drive device that performs duty control of a throttle motor that drives a throttle valve provided in an intake passage of an engine.
Target opening degree computing means for computing an optimal throttle valve opening degree based on operating state information indicating the operating state of the engine including a starter switch signal from a starter switch operated by a driver;
In response to power on, the drive frequency of the throttle motor is made zero, or a high frequency exceeding the human audio frequency band, and a first drive frequency which is a drive frequency which prevents resonance noise with other parts. Driving frequency determination means for outputting;
First driving frequency execution time measuring means for measuring the duration of the state in which the driving frequency of the throttle motor is zero or the first driving frequency;
Target opening degree and actual opening degree difference measuring means for measuring the difference between the target opening degree and the actual opening degree calculated by the target opening degree calculating means;
Drive duty determining means for controlling the opening and closing of the throttle valve by controlling the throttle motor on the basis of the driving frequency from the driving frequency determining means and the information from the target opening degree and the actual opening degree difference measuring means; , And
The drive duty determining means determines that the throttle valve opening is within a predetermined range when the drive frequency is zero or the driver turns on the starter switch within a predetermined value within the duration of the first drive frequency. In order not to change the above, the drive frequency of the throttle motor is changed to zero or a second drive frequency which is a drive frequency for improving the drive capability of the throttle motor from the first drive frequency.

  According to the electronic throttle drive device according to the present invention, the drive frequency of the throttle motor is made zero when the power is turned on, or a high frequency exceeding the human audio frequency band and the drive frequency which prevents resonance noise with other parts. The drive time at the first drive frequency is measured at the same time, and when the drive time at the first drive frequency is within the predetermined value and the driver turns on the starter switch, the throttle valve opening is Since the drive frequency of the throttle motor is changed from zero or from the first drive frequency to a second drive frequency that improves the drive capability of the throttle motor so as not to change beyond a predetermined range, the power is turned on. Throttle motor noise and resonance noise before engine start later are reduced, noise can be improved, and driver opens engine start It was the case, since the throttle valve opening even when the change of the driving frequency is maintained at an appropriate position, there is an effect that the startability of the engine is improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the engine control apparatus provided with the electronic throttle drive device by Embodiment 1 of this invention with an engine. FIG. 1 is a block diagram showing a functional configuration of an engine control device provided with an electronic throttle drive device according to Embodiment 1 of the present invention. It is a flowchart which shows operation | movement of the electronic throttle drive device by Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the electronic throttle drive device by Embodiment 2 of this invention. It is a flowchart which shows operation | movement of the electronic throttle drive device by Embodiment 3 of this invention.

  Hereinafter, preferred embodiments of an electronic throttle drive device according to the present invention and an engine control device provided with the electronic throttle drive device will be described in detail with reference to the drawings.

Embodiment 1
FIG. 1 is a block diagram showing an engine control device provided with an electronic throttle drive device according to a first embodiment of the present invention together with an engine.
In FIG. 1, the engine control device 1 is composed of a microcomputer including a CPU and a memory constituting a main part of the engine drive device, and stores programs and maps for controlling the overall operation of the engine 2.

  The intake pipe 3 for introducing the intake air A to the engine 2 includes an intake air temperature sensor 4 for measuring an intake air temperature which is a temperature of the intake air A to the engine 2, a throttle valve 5 which is opened and closed by a throttle motor 5A. The fuel injection device 8 includes a throttle position sensor 6 that measures the throttle valve opening Tp of the throttle valve 5, an intake pressure sensor 7 that measures an intake pressure Pa downstream of the throttle valve 5, and an injector for injecting fuel. It is provided.

  The engine 2 also includes an engine temperature sensor 9 for measuring the engine temperature, which is the wall surface temperature of the engine 2, and a crank angle sensor for outputting the engine rotation speed Ne and a crank angle signal SGT corresponding to the crank position in the form of a pulse signal. 10 and an ignition plug 11 driven by an ignition coil 11A.

  Further, the fuel tank 12 is provided with a fuel pump 13 for feeding fuel to the fuel injection device 8. An accelerator grip position sensor 14 and a starter switch 15 are provided on a handle (not shown) operated by a driver, and the starter motor 16 is directly driven from the starter switch 15 by a mechanism (not shown). Or driven by a drive signal from the engine control device 1. In addition, the code | symbol Ah in FIG. 1 has shown the exhaust_gas | exhaustion.

FIG. 2 is a block diagram showing a functional configuration of an engine control device provided with the electronic throttle drive device according to the first embodiment.
2, various sensors 20 include an accelerator grip position sensor 14 shown in FIG. 1, a throttle position sensor 6, an intake pressure sensor 7, and a crank angle sensor 10, and various operations indicating the operating state of the engine 2 As the state information, an accelerator grip opening degree Gp, a throttle valve opening degree Tp, an intake pressure Pa, an engine rotational speed Ne, and a crank angle signal SGT, which are output signals thereof, are input to the engine control device 1. Similarly, the starter switch signal of the starter switch 15 is also input to the engine control device 1.

  The engine control device 1 includes an electronic throttle drive device 21 for driving the throttle motor 5A and an engine drive device 22. The electronic throttle drive device 21 includes a target opening degree calculation means 21A, a drive frequency determination means 21B, a first drive frequency execution time measurement means 21C, a drive duty determination means 21D, a throttle motor drive device 21E, and a target opening degree and an actual opening degree. The engine drive unit 22 includes a starter drive unit 22A, an injector drive unit 22B, an ignition coil drive unit 22C, and a fuel pump drive unit 22D.

  The electronic throttle drive device 21 calculates the optimum throttle valve opening degree Tp in the target opening degree calculation means 21A based on the information from the various sensors 20 and the starter switch 15, and the drive frequency is calculated in the drive frequency determination means 21B. A frequency that prevents throttle motor noise and resonance noise, that is, a high frequency exceeding the human audio frequency band although the drive capacity of the electronic throttle is slightly reduced, a frequency that prevents resonance noise with other parts, etc. It is decided whether to use the first drive frequency that can achieve the quietness according to the second drive frequency or the second drive frequency that the drive capacity of the throttle motor 5A is improved although the drive noise is slightly emitted. The drive time at the first drive frequency is measured. When the drive time at the first drive frequency exceeds a predetermined time, the first drive frequency implementation time measuring unit 21C transmits the information to the drive frequency determination unit 21B, and the drive frequency determination unit 21B is a throttle. It also outputs a command to stop the driving of the motor 5A.

  The drive duty determination means 21D drives the throttle motor based on the drive frequency from the drive frequency determination means 21B and the target opening degree for measuring the difference between the target opening degree and the actual opening degree from the actual opening degree difference measuring means 21F. The throttle motor 5A is controlled via the device 21E to control the opening and closing of the throttle valve opening degree Tp.

Next, the operation of the electronic throttle drive device according to the first embodiment configured as described above will be described.
FIG. 3 is a flowchart showing the operation of the electronic throttle drive device according to the first embodiment. In FIG. 3, when the engine 2 and the electronic throttle drive device 21 are powered on, in step S101, the target opening degree calculation means 21A, the drive frequency determination means 21B, and the drive duty determination means 21D of the electronic throttle drive device 21. With the drive frequency of the throttle motor 5A as the first drive frequency, the throttle valve 5 is opened to the target opening degree, and the throttle valve 5 is kept at the target opening degree as it is. Start measuring the execution time of the first drive frequency.

  Subsequently, in step S103, it is checked whether the driver turns on the starter switch 15 to start the engine 2. If the starter switch 15 is turned on, the process proceeds to step S104 and the difference between the target opening degree and the actual opening degree The measuring means 21F monitors the throttle valve opening degree Tp and gradually adjusts the driving frequency from the first driving frequency while adjusting the driving duty to keep the deviation between the target opening degree and the actual opening degree within a predetermined value. This routine is ended to change to the drive frequency and to carry out the operation after the engine start.

  If it is determined in step S103 that the driver does not turn on the starter switch 15 in step S105, it is determined in step S105 that the time obtained by the first drive frequency implementation time measuring means 21C has exceeded the predetermined time, the process proceeds to step S106. Then, the drive frequency determination means 21B outputs a command to stop the drive of the throttle motor 5A. As a result, the drive of the throttle motor 5A is stopped through the drive duty determining means 21D.

  Thereafter, in step S107, it is checked whether the driver turns on the starter switch 15. If the driver turns on the starter switch 15, the process proceeds to step S108, and the target opening calculation means 21A of the electronic throttle drive device 21 The drive frequency determining means 21B, the drive duty determining means 21D, and the target opening degree and actual opening degree difference measuring means 21F monitor the throttle valve opening degree Tp with the drive frequency of the throttle motor 5A as the second drive frequency. The throttle motor 5A is driven while adjusting the drive duty so that the opening degree becomes the target opening degree immediately without largely deviating from the target opening degree, and this routine is ended so that the operation after the engine start is performed. .

  As described above, in the electronic throttle drive device according to the first embodiment, when the power is turned on, the drive frequency of the electronic throttle is slightly reduced, but the high frequency beyond the human audio frequency band or the resonance noise with other parts The first drive frequency, which is the drive frequency at which quietness according to the vehicle can be achieved, such as a frequency to prevent the same, and at the same time the drive time at the first drive frequency is measured, and the drive time at the first drive frequency is predetermined time If the driver turns on the starter switch 15, the throttle valve opening Tp is monitored, and while the deviation of the throttle target opening is kept within a predetermined value, the drive frequency slightly makes a noise but the throttle motor 5A The second drive frequency is gradually changed to a frequency at which the drive capability of the second drive frequency is improved. Therefore, the throttle motor noise and resonance noise before starting the engine after power-on can be reduced to improve quietness, and when the driver starts engine starting, the throttle valve opening degree Tp is also changed when the drive frequency is changed. Is maintained at a proper position, so that the startability of the engine 2 can be improved.

  Also, if the driver does not turn on the starter switch 15 even if the state of the first drive frequency continues beyond the predetermined time, the drive of the throttle motor 5A is stopped, and then the drive frequency before engine start is stopped. When the driver turns on the starter switch 15, the throttle valve opening degree Tp is monitored by the throttle sensor, and the driving frequency of the throttle motor 5A is set to the second driving frequency so that the throttle valve opening degree Tp quickly becomes the target opening degree. I assume. Therefore, the quietness before starting the engine can be achieved, the high frequency state of the drive frequency is limited, and the drive element such as FET mounted on the drive circuit of the throttle motor drive 21E in the electronic throttle drive 21 has a high temperature When the driver starts engine start, the throttle valve opening degree Tp smoothly reaches the target opening degree, and the startability of the engine 2 can be improved.

Second Embodiment
Next, an engine control system provided with an electronic throttle drive system according to Embodiment 2 of the present invention will be described.
The configuration and the functional configuration of the engine control device provided with the electronic throttle drive device according to the second embodiment are the same as those of the first embodiment shown in FIG. 1 or FIG. The operation of the throttle drive system will be described.

  FIG. 4 is a flow chart showing the operation of the electronic throttle drive system according to the second embodiment. Steps S101 to S108 are the same as the first embodiment according to FIG.

  In the electronic throttle drive device according to the second embodiment, when the driver turns on the starter switch 15 within a predetermined time in step S103, the drive frequency is changed from the first drive frequency to the second drive frequency in step S104. The drive frequency stands by until the drive frequency reaches the second drive frequency, and after it is determined that the drive frequency has reached the second drive frequency, the process proceeds to step S111 where the drive of the fuel pump, the injector and the ignition coil is started. It is done.

  If the driver does not turn on the starter switch 15 within a predetermined time, the drive of the throttle motor 5A is stopped in step S106, and thereafter, if it is determined that the driver turns on the starter switch 15 in step S107, the step The throttle motor 5A is driven with the drive frequency as the second drive frequency so as to achieve the target opening degree while monitoring the throttle valve opening degree Tp in S108, and the throttle valve opening degree Tp becomes the target opening degree in step S110. Until it is determined that the throttle valve opening degree Tp has become the target opening degree in step S110, the process proceeds to step S111, and driving of the fuel pump, the injector, and the ignition coil is started.

  As described above, in the electronic throttle drive device according to the second embodiment, when the power is turned on, the drive frequency of the electronic throttle is slightly reduced, but the high frequency beyond the human audio frequency band or the resonance noise with other parts The first drive frequency, which is the drive frequency at which quietness according to the vehicle can be achieved, such as a frequency to prevent the same, and at the same time the drive time at the first drive frequency is measured, and the drive time at the first drive frequency is predetermined time If the driver turns on the starter switch 15, the throttle valve opening Tp is monitored, and while the deviation of the throttle target opening is kept within a predetermined value, the drive frequency slightly makes a noise but the throttle motor 5A Gradually change to the second drive frequency, which is the frequency at which the drive capacity of the drive improves, and until the drive frequency changes from the first drive frequency to the second drive frequency, Amplifier is controlled so as not to start the injector, the drive of the ignition coil. Therefore, throttle motor noise and resonance noise before engine start after power on can be reduced to improve quietness, and when the driver starts engine start, delay the start of operation of an actuator such as a fuel pump. Thus, the fluctuation of the power supply voltage can be suppressed, and the throttle valve opening Tp can be maintained at an appropriate position even when the drive frequency is changed, so that the startability of the engine 2 can be improved.

  In addition, when the driver does not turn on the starter switch even if the state of the first drive frequency continues beyond the predetermined time, the drive of the throttle motor 5A is stopped, and thereafter the driver is stopped. When the starter switch 15 is turned on, the throttle valve opening degree Tp is monitored by the throttle sensor, and the drive frequency of the throttle motor 5A is driven to the second opening speed so that the throttle valve opening degree Tp quickly becomes the target opening degree. Control is performed so that the fuel pump, the injector, and the ignition coil are not started until the throttle valve opening degree Tp reaches the target opening degree. Therefore, the quietness before starting the engine can be achieved, the high frequency state of the drive frequency is limited, and the drive element such as FET mounted on the drive circuit of the throttle motor drive 21E in the electronic throttle drive 21 has a high temperature When the driver starts engine start, it is possible to suppress the fluctuation of the power supply voltage by delaying the start of operation of the fuel pump, injector, and ignition coil, and throttle valve opening Tp is appropriate. Since the opening degree is smoothly reached, the startability of the engine 2 can be improved.

Third Embodiment
Next, an engine control system provided with an electronic throttle drive system according to Embodiment 3 of the present invention will be described.
The configuration and the functional configuration of the engine control device provided with the electronic throttle drive device according to the third embodiment are the same as those of the first embodiment shown in FIG. 1 or FIG. The operation of the throttle drive system will be described.

  FIG. 5 is a flow chart showing the operation of the electronic throttle drive system according to the third embodiment. Steps S101 to S110 are the same as those of the second embodiment according to FIG.

  In the electronic throttle drive according to the third embodiment, when the driver turns on the starter switch 15 within a predetermined time in step S103, the drive frequency is changed from the first drive frequency to the second drive frequency in step S104, step S109. At step S111A, it is determined that the drive frequency has become the second drive frequency, and then the process proceeds to step S111A where the starter motor 16 is turned on to start the drive of the engine 2. Further, the process proceeds to step S111, and driving of the fuel pump, the injector, and the ignition coil is started.

  If the driver does not turn on the starter switch 15 within a predetermined time, the drive of the throttle motor 5A is stopped in step S106, and thereafter, if it is determined that the driver turns on the starter switch 15 in step S107, the step The throttle motor 5A is driven with the drive frequency as the second drive frequency so as to achieve the target opening degree while monitoring the throttle valve opening degree Tp in S108, and the throttle valve opening degree Tp becomes the target opening degree in step S110. Until it is determined in step S110 that the throttle valve opening degree Tp has become the target opening degree, the process proceeds to step S111A, the starter motor 16 is turned on to start driving the engine 2, and further proceeds to step S111 To start driving the fuel pump, the injector, and the ignition coil. It is. The starter motor 16 is configured to be driven by a starter drive device (not shown) such as a starter relay operated by the starter switch 15.

  As described above, the electronic throttle drive device according to the third embodiment includes the starter drive device, and when the power is turned on, the drive frequency is reduced to a high frequency beyond the human audio frequency band although the drive capacity of the electronic throttle slightly decreases. The first drive frequency is a drive frequency that achieves quietness according to the vehicle, such as a frequency that prevents resonance noise with other parts, and at the same time the drive time at the first drive frequency is measured. When the driver turns on the starter switch 15 within a predetermined time, the throttle valve opening Tp is monitored, and the drive frequency is slightly increased while maintaining the deviation of the throttle target opening within a predetermined value. Is gradually changed to the second drive frequency which is a drive frequency at which the drive capacity of the throttle motor 5A is improved, and the drive frequency is further changed from the first drive frequency to the second drive frequency. Until the dynamic frequency is controlled so as not to drive the starter motor 16. Therefore, the throttle motor noise and resonance noise before engine start after power on are reduced, and quietness can be improved, and when the driver starts engine start, power supply is delayed by delaying the start of operation of starter motor 16. The fluctuation of the voltage can be suppressed, and the throttle valve opening degree Tp is held at an appropriate position even when the drive frequency is changed, so that the startability of the engine 2 can be improved.

  Also, if the driver does not turn on the starter switch 15 even if the state of the first drive frequency continues beyond the predetermined time, the drive of the throttle motor 5A is stopped, and then the drive frequency before engine start is stopped. When the driver turns on the starter switch 15, the throttle valve opening degree Tp is monitored, and the drive frequency of the throttle motor 5A is set to the second drive frequency so that the throttle valve opening degree Tp quickly becomes the target opening degree. Control is performed so that the driving of the starter motor 16 is not started until the throttle valve opening degree Tp becomes the target opening degree. Therefore, the quietness before starting the engine can be achieved, the high frequency state of the drive frequency is limited, and the drive element such as FET mounted on the drive circuit of the throttle motor drive 21E in the electronic throttle drive 21 has a high temperature When the driver starts engine start, delaying the start of the operation of the starter motor 16 makes it possible to suppress fluctuations in the power supply voltage, and the throttle valve opening degree Tp is set to an appropriate degree. In order to reach smoothly, the startability of the engine 2 is improved.

  Further, although the first to third embodiments of the present invention have been described above, the present invention is not limited to this, and various design changes can be made, and within the scope of the invention The respective inventions can be freely combined, appropriately modified or omitted. For example, in each of the above-described embodiments, the first drive frequency is a drive frequency at which quietness can be achieved according to the vehicle, such as a high frequency exceeding the human audio frequency band or a frequency that prevents resonance noise with other components. As described above, the drive frequency may be zero (that is, equal to drive stop).

Reference Signs List 1 engine control device, 2 engine, 3 intake pipe, 4 intake temperature sensor, 5 throttle valve, 5 A throttle motor, 6 throttle position sensor, 7 intake pressure sensor, 8 fuel injection device, 9 engine temperature sensor, 10 crank angle sensor, Reference Signs List 11 spark plug, 11A ignition coil, 12 fuel tank, 13 fuel pump, 14 accelerator grip position sensor, 15 starter switch, 16 starter motor, 20 various sensors, 21 electronic throttle drive device, 21A target opening calculation means, 21B drive frequency Determination means, 21C first drive frequency execution time measurement means, 21D drive duty determination means, 21E throttle motor drive device, 21F target opening degree difference measurement means, 22 engine drive device, 22A starter drive device, 22B Injector drive unit, 22C ignition coil drive unit, 22D fuel pump drive unit, A intake air, Ah exhaust, Tp throttle valve opening, Pa intake pressure, Ne engine rotational speed, SGT crank angle signal, Gp accelerator grip opening.

Claims (5)

An electronic throttle drive device for duty controlling a throttle motor for driving a throttle valve provided in an intake passage of an engine, comprising:
Target opening degree computing means for computing an optimal throttle valve opening degree based on operating state information indicating the operating state of the engine including a starter switch signal from a starter switch operated by a driver;
In response to power on, the drive frequency of the throttle motor is made zero, or a high frequency exceeding the human audio frequency band, and a first drive frequency which is a drive frequency which prevents resonance noise with other parts. Driving frequency determination means for outputting;
First driving frequency execution time measuring means for measuring the duration of the state in which the driving frequency of the throttle motor is zero or the first driving frequency;
Target opening degree and actual opening degree difference measuring means for measuring the difference between the target opening degree and the actual opening degree calculated by the target opening degree calculating means;
Drive duty determining means for controlling the opening and closing of the throttle valve by controlling the throttle motor on the basis of the driving frequency from the driving frequency determining means and the information from the target opening degree and the actual opening degree difference measuring means; , And
The driving frequency determining means determines that the throttle valve opening is within a predetermined range when the driving frequency is zero or when the driver turns on the starter switch within a predetermined time. An electronic throttle characterized in that the drive frequency of the throttle motor is changed from zero or from the first drive frequency to a second drive frequency which is a drive frequency for improving the drive capability of the throttle motor so as not to change the above Drive device. An electronic throttle drive device for duty controlling a throttle motor for driving a throttle valve provided in an intake passage of an engine, comprising:
Target opening degree computing means for computing an optimal throttle valve opening degree based on operating state information indicating the operating state of the engine including a starter switch signal from a starter switch operated by a driver;
In response to power on, the drive frequency of the throttle motor is made zero, or a high frequency exceeding the human audio frequency band, and a first drive frequency which is a drive frequency which prevents resonance noise with other parts. Driving frequency determination means for outputting;
First driving frequency execution time measuring means for measuring the duration of the state in which the driving frequency of the throttle motor is zero or the first driving frequency;
Target opening degree and actual opening degree difference measuring means for measuring the difference between the target opening degree and the actual opening degree calculated by the target opening degree calculating means;
Drive duty determining means for controlling the opening and closing of the throttle valve by controlling the throttle motor on the basis of the driving frequency from the driving frequency determining means and the information from the target opening degree and the actual opening degree difference measuring means; , And
The drive frequency determination means stops the drive of the throttle motor when the drive frequency is zero or when the driver does not turn on the starter switch within a predetermined time period at the first drive frequency. When the driver turns on the starter switch for more than the predetermined time, the drive frequency of the throttle motor is set to zero or the first drive so that the throttle valve opening degree becomes the target opening degree. An electronic throttle drive device characterized by changing from a frequency to a second drive frequency which is a drive frequency for improving the drive capability of the throttle motor.   When the drive frequency is zero or the duration time at the first drive frequency is not turned on by the driver within the predetermined time, the drive of the throttle motor is stopped, and the driver does not turn on the starter motor. When the starter switch is turned on for a predetermined time, the drive frequency of the throttle motor is set to zero or the first drive frequency is set to the second drive frequency so that the throttle valve opening degree becomes the target opening degree. The electronic throttle drive according to claim 1, wherein the frequency is changed. An electronic throttle drive according to any one of claims 1 to 3;
A fuel pump drive device for driving a fuel pump that supplies fuel according to the operating state of the engine;
An injector drive unit for driving an injector that injects the fuel;
An ignition coil drive device for driving an ignition coil for igniting the fuel;
The drive of the fuel pump drive device, the injector drive device, and the ignition coil drive device is not started until the drive frequency of the throttle motor becomes zero or the first drive frequency becomes the second drive frequency. An engine control device characterized by An electronic throttle drive according to any one of claims 1 to 3;
And a starter drive device for driving a starter motor for driving the engine.
An engine control apparatus characterized in that the drive of the starter motor is not started until the drive frequency of the throttle motor becomes zero or becomes the second drive frequency from the first drive frequency.

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