JPH0245491Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a throttle valve control device for an engine.

[Prior Art] Recently, with the remarkable development of electronics in vehicle engines, various proposals have been made to electrically control various types of engine control. There is an engine throttle valve control device disclosed in the publication. That is, this system extracts the movement of the accelerator pedal as an electrical signal, and uses this electrical signal to drive a throttle valve drive motor and the like to electrically open and close the throttle valve. This type of throttle valve control device is different from the usual one in which the accelerator pedal and the throttle valve are connected by a link mechanism or a wire mechanism to mechanically open and close the throttle valve. This has the advantage that the throttle valve can be freely controlled to obtain engine output, and the pressing force of the accelerator pedal can be reduced.

By the way, considering the operation when starting a vehicle engine, normally the throttle valve is opened to a predetermined starting opening degree, and the starter motor is rotated to start the engine. However, in conventional electrically controlled throttle valve control devices, the throttle valve drive motor is simply driven together with the starter motor at the time of starting, and in this case, the throttle valve drive motor is given as much power as, for example, the power supplied to the headlight. Since it is necessary to supply electric power to the starter motor and also to the starter motor at the time of starting, there is a problem in that over-discharge of the battery, that is, battery over-discharge occurs.

[Purpose of invention]

In view of these problems, this invention aims to provide an engine throttle valve control device that can prevent battery build-up during startup.

[Structure of the idea]

By the way, in the above-mentioned electric control type throttle valve control device, when opening the throttle valve from fully closed to the starting opening, it is necessary to open the throttle valve against the spring force of its return spring. Although a large amount of electric power must be supplied to the throttle valve drive motor as shown in FIG. Therefore, when starting the engine,
By opening the throttle valve to a predetermined starting opening and operating the starter while holding the throttle valve at that opening, it is possible to reduce battery power consumption and prevent battery build-up. Be expected.

Therefore, this invention was developed in an engine throttle valve control device that electrically drives the throttle valve in accordance with the amount of accelerator operation. The starter is operated while the voltage applied to the motor is lowered.

That is, in this invention, as shown in the functional block diagram of FIG. The throttle valve driving means 42 drives the throttle valve 43 in response to the output of the calculating means 41, while the start detecting means 44 detects when the engine is started, and the starting opening degree calculating means 45 detects when the engine starts. The starting assisting means 46 receives the output of the visual movement detecting means 44 and replaces the output of the starting opening calculating means 45 with the output of the calculating means 41 during engine startup to drive the throttle valve. Means 4
In addition to 2, the starter 47 is operated after the throttle valve 43 opens to a predetermined starting opening degree.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

2 to 6 show an engine throttle valve control device according to an embodiment of the present invention. In FIG. 2, 1 is an engine, and a throttle valve 3 is disposed in the middle of an intake passage 2 of the engine 1. A throttle actuator 4 such as a step motor or a DC motor opens and closes the throttle valve 3.
is installed. A vane type air flow meter 5 is installed on the upstream side of the throttle in this intake passage 2.
is provided, and the upstream end of the intake passage 2 reaches an air cleaner 6.

Further, a fuel injection valve 7 is provided on the downstream end side of the intake passage 2, and the fuel injection valve 7 is connected to a fuel tank 9 via a fuel supply passage 8.
A fuel pump 10 and a fuel filter 11 are installed in the middle of the
A fuel return passage 12 is connected between the downstream side of the fuel filter 11 and the fuel tank 9, and a fuel pressure regulator 13 is connected in the middle of the passage 12.
is provided so that a constant fuel pressure is supplied to the fuel injection valve 7.

On the other hand, a catalyst 15 for purifying exhaust gas is disposed in the exhaust passage 14 of the engine 1, and an EGR device 16 is disposed between the exhaust passage 14 and the intake passage 2. In this EGR device 16, one end of the EGR passage 17 is connected to the exhaust passage 14.
The other end of 7 is connected to the intake passage 2, and an EGR valve 18 is interposed in the middle of the EGR passage 17.
The valve 18 is provided with a solenoid 19 for driving it.

Further, in FIG. 2, 20 is an accelerator pedal, 21 is a battery, 22 is an igniter, 23 is a rotation speed sensor that detects the engine speed from the rotation angle of the distributor, and 24 is an accelerator pedal that detects the operating amount of the accelerator pedal 20. Position sensor 25 is a water temperature sensor that detects the engine cooling water temperature.
6 is an intake temperature sensor that detects the temperature of intake air; 2
7 is a throttle position sensor that detects the opening degree of the throttle valve 3, and 28 is an O ₂ sensor that detects the oxygen concentration in the exhaust gas.

Further, 29 is a computer unit that performs various engine controls, and the computer unit 29
controls the ignition timing by applying a control signal to the igniter 22 in accordance with the engine rotation, and controls the EGR amount by applying a control signal to the solenoid 19 of the EGR valve 18 in accordance with the operating state of the engine.
Furthermore, the computer unit 29 applies a starting fuel injection pulse to the fuel injection valve 7 when starting the engine, and applies a fuel injection pulse to the fuel injection valve 7 according to the operating state of the engine during normal operation, thereby controlling the fuel injection amount. control.

When starting the engine, the computer unit 29 applies a drive signal to the throttle actuator 4 to open the throttle valve 3 to a predetermined starting opening, and then applies a control signal to the starter motor relay 37 to operate the starter 38. During normal operation, the throttle valve opening is controlled by calculating the throttle opening according to the accelerator operation amount and applying a corresponding drive signal to the throttle actuator 4 to open and close the throttle valve 3.

Further, FIG. 3 shows the configuration of the driving force transmission mechanism of the throttle actuator 4, in which the throttle valve 3 is rotatably supported in the intake passage 2 by a shaft 3a.
A throttle actuator 4 is fixed to the intake passage 2, and a shaft 4a of the throttle actuator 4 is fixed to the intake passage 2.
A fail-safe mechanism 30 consisting of an electromagnetic clutch is interposed between the shaft 3a of the throttle valve 3 and the shaft 3a of the throttle valve 3 to disconnect the transmission of driving force in the event of a failure, etc., and also urges the throttle valve 3 to rotate in the fully closed direction. A return spring 31 is provided.

FIG. 4 is a diagram for explaining the arithmetic processing of the computer unit 29, and for convenience of explanation, the arithmetic processing of the computer unit 29 is shown using a hardware circuit. In the figure, the same symbols as in FIG. 2 indicate the same things as in the same figure, α is the output of the accelerator position sensor 24, Tw is the output of the water temperature sensor 25, Ta is the output of the intake air temperature sensor 26,
ST is the engine starter signal.

Further, 32 and 33 are function generating means that generate an output value determined by the x value and y value when the input is the x value and y value.
The output value is obtained by inputting the value and y value as an address and reading out the stored value of the map. Specifically, 32 is the accelerator operation amount α
33 is the accelerator operation amount α
This is a starting basic target fuel injection amount generating means that generates a starting basic target fuel injection amount QfiS determined by the water temperature Tw and the starting basic target fuel injection amount QfiS.

34 is the basic target throttle opening at startup.
TVS, a motor control module that receives the starter signal ST and intake air temperature Ta as inputs and outputs the actual target throttle opening TVO, power supply control signal VA and starter drive signal STA at the time of starting; 35 is a fuel injection pulse Tau according to the battery voltage; A correction means 36 is a power supply control means for controlling the power supply voltage to be applied to the throttle actuator 4 to a high voltage or a low voltage in accordance with the power supply control signal VA.

In addition, in the above configuration, the starter signal
ST is the output of the start detecting means 44 shown in FIG. 1, and the throttle actuator 4 and computer unit 29 are the throttle valve driving means 42 shown in FIG. 29 is the calculation means 4 shown in FIG.
1. Starting opening calculation means 45 and starting assisting means 46
It is designed to realize each of the following functions.

Next, the operation will be explained using FIGS. 4 to 6. Here, FIG. 5 shows a flowchart of the arithmetic processing of the computer unit 29, and FIG.
shows the timing chart of the ON/OFF state of the ignition switch, the power supply voltage state of the throttle actuator 4, and the ON/OFF state of the starter switch.

When the accelerator pedal 20 is depressed and the ignition switch is turned on (see A in Figure 6a), the accelerator position sensor 24 detects the accelerator operation amount α, and the water temperature sensor 25 detects the engine coolant temperature Tw. The intake air temperature is detected by the intake air temperature sensor 26.
Ta is detected, and the outputs of the sensors 24 to 26 are input to the computer unit 29.
In this computer unit 29, a starting basic target throttle opening generating means 32 generates a starting basic target throttle opening TVS according to the accelerator operation amount α and water temperature Tw, and a starting basic target fuel injection amount generating means At 33, accelerator operation amount α and water temperature
A basic target fuel injection amount QfiS at startup is generated according to Tw, and this basic target fuel injection amount QfiS at startup is generated.
is corrected in accordance with the battery voltage by the correction means 35, and then given to the fuel injection valve 7 as the starting fuel injection pulse Tau. As a result, the fuel injection valve 7 opens for a time corresponding to the pulse width of the fuel injection pulse Tau in synchronization with the ignition timing, and starting fuel is injected and supplied to the engine.

In addition, the basic target throttle opening TVS at the time of starting mentioned above
is input to the motor control module 34,
In this motor control module 34, when the ignition switch is turned on (see A in FIG. 5a),
Read the output of the intake air temperature sensor 26 (step 5)
0), the basic target throttle opening TVS at startup is corrected according to the read intake air temperature Ta to obtain the actual target throttle opening TVO (step 51), and the control signal VA is applied to the power supply control means 36 to turn on the drive power. After setting to the high voltage side (see item B in Fig. 6b) (step 52), the above actual target throttle opening TVO is applied to the throttle actuator 4 (step 53), and the throttle valve 3 returns to It opens to a predetermined starting opening degree TVO against the spring force of the spring 31.

When the throttle valve 3 opens to a predetermined starting opening, the motor control module 34 applies a control signal to the power supply control means 36 to switch the drive power supply to the low voltage side (Fig. 6b).
(see section C) (step 54), and then the starter switch is turned on from the state of the starter signal ST.
It is determined whether the starter switch is turned on (step 55), and if the starter switch is not turned on, the starter 38 remains in the OFF state (step 5).
6) When the starter switch is turned on (see section D in Fig. 6c), a drive signal is applied to the starter motor relay 37 to operate the starter 38 (step 57), thereby starting the engine.
Thereafter, the operation of the starter 38 is stopped (steps 58 and 59).

When the engine is started in this way, the computer unit 29 calculates the opening degree of the throttle valve 3 according to the accelerator operation amount α, applies it to the throttle actuator 4, and controls the opening and closing of the throttle valve 3. The fuel injection amount is calculated according to the operating state of the engine, a corresponding fuel injection pulse Tau is created, and this is applied to the fuel injection valve 7 to control the fuel injection amount. Further, the computer unit 29 applies a control signal to the igniter 22 according to the rotation of the engine to control the ignition timing, and also applies a control signal to the solenoid 19 of the EGR valve 18 according to the operating state of the engine to control the EGR amount. . Note that each operation of throttle valve opening control after startup, fuel injection amount control after startup, ignition timing control, and EGR amount control are the same as those conventionally known, so detailed explanation thereof will be omitted.

In the device of this embodiment as described above, the throttle valve is opened to the starting opening degree and the starter is operated with the voltage applied to the throttle actuator lowered, thereby significantly reducing battery power consumption. By reducing this, battery build-up can be reliably prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various modifications and changes are possible. For example, if the arithmetic processing of the computer unit achieves the same function, it can be modified as shown in FIGS. 4 and 5. It may be different from .

[Effect of idea]

As described above, according to the present invention, in the engine throttle valve control device that electrically drives the throttle valve according to the accelerator operation amount,
After opening the throttle valve to a predetermined starting opening when starting the engine, the starter is operated with the voltage applied to the throttle valve drive motor reduced, so the electrical load at the time of starting can be kept to a minimum.
It has the effect of preventing battery build-up.

[Brief explanation of the drawing]

Figure 1 is a functional block diagram showing the configuration of the present invention.
The figure is a schematic configuration diagram of an engine throttle valve control device according to an embodiment of the present invention, FIG. 3 is a partially enlarged sectional view of the device, and FIG. 4 is a diagram for explaining the arithmetic processing of the computer unit in the device. 5 is a diagram showing a flowchart of specific calculation processing of the motor control module 34 in FIG. 4, and FIG. 6 is a diagram for explaining the operation of the above device. 40...Accelerator detection means, 41...Calculation means, 42...Throttle valve drive means, 43...Throttle valve, 44...Start detection means, 45...Start opening calculation means, 46...Start assist means, 3...
Throttle valve, ST...Starter signal, 24...
Accelerator position sensor, 29...computer unit, 38...starter.

Claims (1)

[Scope of Claim for Utility Model Registration] Accelerator detection means for detecting the amount of accelerator operation; calculation means for calculating the opening degree of a throttle valve in response to the output of the accelerator detection means; and driving the throttle valve in response to the output of the calculation means. a throttle valve driving means for detecting the starting of the engine; a starting detection means for detecting the starting of the engine; a starting opening calculation means for calculating the opening of the throttle valve at the time of starting the engine; a starting assist means for outputting the output of the throttle valve driving means to the throttle valve driving means in place of the output of the calculating means and operating the starter after the throttle valve has opened to the starting opening degree; A throttle valve for an engine, characterized in that the driving voltage of the engine is increased only when the throttle valve is opened when the engine is started, and is set to a low voltage when the starter is started after the throttle valve has opened to the opening degree at the time of starting. Control device.