JPH0370832A - Throttle driving controller - Google Patents

Abstract

PURPOSE:To control opening of a throttle valve with high accuracy by storing a detection value after closing or opening the valve during engine stop so as to compensate the detection value of an opening detection means based on the stored value. CONSTITUTION:During stoppage of an engine, a throttle valve B is fully closed or opened, and a detection value of an opening detection means D is stored in a storing means G. During operation of the engine, the detection value of the opening detection means D is compensated by a compensating means I by means of the memory value of the storing means G. The throttle valve B is openly adjusted by a driver C which is controlled by a control means J based on the compensation value.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a throttle drive control device for driving and controlling a throttle valve using a drive device such as an electric motor.

<Prior Art> As a conventional example of this type of throttle drive control device, there is the following (see Japanese Patent Laid-Open No. 192824/1982).

That is, a second throttle valve is interposed in the intake passage in parallel with the first throttle valve that is linked to the depression operation of the accelerator pedal, and the second throttle valve is driven to open and close by an electric motor. The second throttle valve is held at a substantially fully open position by a return spring when not being controlled.

For example, when the drive wheels slip during starting or acceleration, the electric motor is energized by the control device to drive and control the second throttle valve in the fully closed direction so that the second throttle valve reaches the target opening. Decrease air flow rate and reduce engine output.

This reduces the driving force of the vehicle and prevents the driving wheels from slipping (hereinafter referred to as traction control).

By the way, due to the mounting position of the throttle sensor that detects the opening degree of the second throttle valve, changes over time, etc., a discrepancy occurs between the actual opening degree of the second throttle valve and the opening degree detected by the throttle sensor. There is a problem that the control accuracy of the valve decreases.

Therefore, conventionally, the second throttle valve is forcibly fully closed once when a predetermined condition (such as when the accelerator pedal is off) is satisfied after the engine key switch is turned on, and the output voltage of the throttle sensor when fully closed is stored in RAM. I try to let them do it. Then, the output voltage of the throttle sensor is corrected using the output voltage when the throttle is fully closed as a reference voltage to accurately control the opening degree of the second throttle valve, thereby improving the control accuracy of the second throttle valve. .

<Problems to be Solved by the Invention> However, in such a conventional throttle drive control device, the second throttle valve is forcibly fully closed after the engine key switch is turned on, that is, during engine operation, regardless of the driver's will. Since the engine is controlled, there is a risk that the engine output may change and cause the driver to feel uneasy. Also,
Even if the fully closed control is performed during idling operation, there is a problem in that if sudden acceleration operation is started while the second throttle valve is fully closed, hesitation occurs due to a delay in the response of the electric motor. Furthermore, if the fully closed control is performed during cooling operation, there is a problem that the intake air flow rate becomes insufficient, deteriorating drivability and, in the worst case, causing an engine stall.

The present invention has been made in view of the above circumstances, and provides a throttle drive control that can improve the control accuracy of the throttle valve by performing optimal full-close or full-open control while preventing deterioration of drivability, engine stall, etc. The purpose is to provide equipment.

<Means for Solving the Problems> Therefore, as shown in FIG. 1, the present invention includes a throttle valve B interposed in an intake passage A, a drive device C for driving the throttle valve B to open and close, and a drive device C for driving the throttle valve B to open and close. an opening detecting means for detecting the opening of the throttle valve B; an engine operating state determining means E for determining whether or not the engine is in a stopped state; Learning control means F for controlling the driving device C to fully close or open the valve B, and writing means for storing in the storage means G the detection value of the opening degree detection means when the throttle valve is fully closed or fully opened. H, an opening correction means I for correcting the detection value of the opening detection means based on the stored value in the storage means G during engine operation, and an opening correction means I for correcting the opening of the throttle valve B based on the corrected detection value. and an opening control means J for controlling the drive device C to control the opening degree.

<Operation> In this way, while the engine is stopped, the throttle valve is fully closed or fully opened, and the detected value of the opening detection means at this time is stored in the storage means. Then, during engine operation, the detected value of the opening detection means is corrected based on the stored value of the storage means,
The throttle valve is controlled based on this correction value.

<Example> An example of the present invention will be described below based on FIGS. 2 to 4. In this embodiment, traction control will be explained as an example.

In FIG. 2, a first throttle valve 3 is interposed in an intake passage 2 of an engine I, and the first throttle valve 3 is controlled to open and close in conjunction with the depression of an accelerator pedal 4. A second throttle valve 5 is interposed in the intake passage 2 upstream of the first throttle valve 3, and the second throttle valve 5 is operated by an electric motor 7 as a drive device based on a control signal from a throttle motor control device 6. Drives opening and closing. Here, the second throttle valve 5 is held at the fully open position by the valve opening bias of a return spring (not shown) during non-traxagonal control.

Further, a fuel injection valve 8 is provided in the intake passage 2, and the fuel injection valve 8 is controlled by an engine control device 9. Detection signal TVO of the first throttle sensor 10 that detects the opening degree of the first throttle valve 3.

is manually input to the engine control device 9, and also to the automatic transmission control device 11 and the throttle motor control device 6 via the engine control device 9. The detection signal TVO□ of the second throttle sensor 12, which serves as an opening detection means for detecting the opening degree of the second throttle valve 5, is input manually to the throttle motor control device 6. through the buffer of
The engine control device 9 is manually operated. The engine control device 9 includes an intake air flow rate detection signal from an air flow meter 13, a crank angle signal (corresponding to engine rotation speed) from a crank angle sensor 14, a vehicle speed signal from a vehicle speed sensor 15, and a water temperature sensor. The water temperature signal from 16 is input. Further, a detection signal from a neutral switch 17 that detects the stopped state of the vehicle (parking position or neutral position) is manually input to the engine control device 9 and the traction control device 18.

Further, wheel speed sensors 9 to 22 are provided for detecting the rotational speeds of the front, rear, left and right wheels of the vehicle, respectively.These detection signals are manually input to the traction control device 18, and the traction control device 18 adjusts the speed of the driving wheels based on the rotational speeds of the wheels. Detect slip condition. Further, an on/off detection signal from a brake switch 24 that detects the depressed state of the brake pedal 23 is input to the traction control device 18. Further, a signal from a traction switch 25 through which the driver manually selects the operation of traction control is input to the traction control device 18.

In addition, a brake control signal is output from the traction control device 18 to the hydraulic actuator 26 for brake operation, and brake control is performed for each of the front, rear, left, and right wheels to reduce the driving force of the wheels and is used in conjunction with traction control to efficiently prevent slippage. It can be prevented. The traction control device 18 outputs a target opening degree control signal for controlling the opening degree of the second throttle valve 5 to the throttle motor control device 6, and also outputs the operating state of traction control to the engine control device 9. Outputs a TC3 operating signal to notify.

Further, information from the engine control device 9 is input to the automatic transmission control device 11 via the communication IC, and the automatic transmission control device 11 receives the detected vehicle speed and the accelerator opening (first
Opening degree TVO of throttle valve 3.

) etc., the shift solenoids 27 and 28 in the automatic transmission are turned on and off to control the shift to the optimum shift position.

As shown in FIG. 3, the throttle motor control device 6 is provided with a CPU 61, a ROM 62, a first RAM 63, and a second RAM 64 as a storage means.
A backup power supply voltage is applied to the AM64 in order to preserve the stored value even when the engine key switch 29 is turned off. The detection signal of the second throttle sensor 12 is input to the CPU 61 via the A/D converter 65, and the CPU 6L controls the electric motor 7 via the drive circuit 66.

A self-shut relay 30 is provided in parallel with the ignition switch 29, and a transistor 31 is connected in series to a coil 30A of the self-shut relay 30. A power supply voltage is applied to the CPU 61, ROM 62, and first RAM 63 via the contact 30B of the self-shut relay 30. Further, a power supply voltage is applied to the CPU 61 and one terminal of the OR circuit 32 via the engine key switch 29. A relay-on signal is input from the CPU 61 to the other terminal of the OR circuit 32.

The CPU 61 operates according to the flowchart shown in FIG. 4, controls the electric motor 7 to be energized, and outputs a relay-on signal to the other terminal of the OR circuit 32.

Here, the throttle motor control device 6 constitutes an engine operating state determination means, a learning W control means, an opening degree correction means, and an opening degree control means.

In addition, 33 is a TC that informs the operating state of the traction control.
3 is an operating lamp, and 34 is a fail lamp that indicates an abnormality in the traction control or an off state of the traction control.

Next, the operation will be explained according to the flowchart shown in FIG.

At 31, a relay-on signal is output to the OR circuit 32.

As a result, the transistor 31 is turned on and the relay 30
is turned on and the CPU 61 and ROM 6 are connected via contact 30B.
The power supply voltage is applied to the second RAM 63 and the first RAM 63 regardless of whether the engine key switch 29 is on or off.

In S2, it is determined whether the engine key switch 29 is on or not. If YES, the process proceeds to S3, and if NO, the process proceeds to S8.
Proceed to.

In S3, the target opening degree θr is input from the traction control device 18.
Load.

In S4, the actual opening degree (voltage signal) TVO of the second throttle valve 5 detected by the second throttle sensor 12 is read.

In S5, the output voltage TVOC of the second throttle sensor 12 in the fully closed state stored in the second RAM 64 is
The actual opening TVO is corrected by L. For example, by subtracting the output voltage TVOCL from the actual opening TVO, the absolute opening from the fully closed position can be obtained.

In S6, the drive voltage of the electric motor 7 is calculated based on the corrected opening degree and the target opening degree θr.

In S7, the calculated drive voltage is output to the electric motor 7, and feedback control is performed so that the opening degree of the second throttle valve 5 becomes the target opening degree θr.

During such control, when the engine key switch 29 is turned off, that is, when the engine operation is stopped, the process proceeds to step 38.

In S8, the electric motor 7 is energized to open the second throttle valve 5.
fully close.

In S9, the output voltage TVOCL of the throttle sensor 12 when the second throttle valve 5 is fully closed is read.

In the SIO, the read output voltage TVOCL is applied to the second RA.
Store it in M64.

In this way, the output voltage TVOCL stored in the second RAM 64 will be used during the next operation.

As explained above, since the detected value TVO of the second throttle sensor 12 during the traction control is corrected based on the output voltage TVOCL when the second throttle valve 5 is fully closed, the second throttle sensor 12 Even if there are variations in characteristics, installation position, changes over time, etc., the opening degree of the second throttle valve 5 can be controlled with high precision so as to reach the target opening degree θr, and deterioration of drivability and occurrence of engine stall can be prevented.

Also, while the engine is stopped, the second throttle valve 5 is fully closed and the detected value of the second throttle sensor 12 at that time is set to the second R.
Since the information is stored in the AM 64, even if the second throttle valve 5 is fully closed, deterioration in drivability and occurrence of engine stall can be prevented.

Although this embodiment has been described as having two throttle valves 3.5, the present invention is also applicable to a system in which a single throttle valve is operated by a drive device such as an electric motor.

<Effects of the Invention> As explained above, the present invention fully closes or fully opens the throttle valve while the engine is stopped, stores the detected value, and corrects the detected value of the opening detection means based on the stored value. Since the opening degree of the throttle valve is controlled with high accuracy, it is possible to control the opening degree of the throttle valve with high precision, and it is also possible to prevent deterioration of drivability and occurrence of engine stall.

[Brief explanation of drawings]

Fig. 1 is a diagram corresponding to the claims of the present invention, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a block diagram of the main parts of the same, and Fig. 4 is a block diagram showing an embodiment of the present invention.
The figure is the same flowchart as above. 2... Intake passage 3... First throttle valve 5
...Second throttle valve 6...Throttle motor control device 7...Electric motor 12...Second throttle sensor

Claims (1)

[Claims] A throttle valve installed in an intake passage, a drive device that drives the throttle valve to open and close, an opening detection means that detects the opening of the throttle valve, and an engine operating state that determines whether or not engine operation is stopped. a determining means, a learning control means for controlling the drive device to fully close or fully open the throttle valve when it is determined that the engine operation is stopped, and a learning control means for controlling the drive device to fully close or fully open the throttle valve; writing means for storing the detection value of the opening detection means in the storage means; opening correction means for correcting the detection value of the opening detection means based on the stored value of the storage means during engine operation; A throttle drive control device comprising: opening control means for controlling the drive device to control the opening of the throttle valve based on a value.