JPS61106934A - Throttle valve control device of engine - Google Patents

Abstract

PURPOSE:To improve control accuracy of intake amount by increasing air amount supplied to an engine gradually in accordance with the increase of accelerator operating amount even in accelerating from the engine low rotating range. CONSTITUTION:Accelerator operating amount is detected by an acceleration detecting means 16. An engine rotating number is detected by an engine rotating number detecting means 22. An objective intake amount setting means 30 setting an objective value of air supplied to the engine based on accelerator operating amount - objective intake amount characteristic where the maximum intake amount determined by the engine rotating number of then becomes objective intake amount of the full operating amount of the accelerator and the objective intake amount is reduced as the accelerator operating amount is reduced is provided. Then, control accuracy of intake amount can be improved.

Description

Detailed Description of the Invention (Industrial Field of Application) -1 The present invention relates to an engine throttle valve control device, and in particular, the present invention relates to an engine throttle valve control device, and in particular to a throttle valve control device that controls the throttle valve to open as close to a predetermined intake air amount in response to an accelerator operation amount that indicates a required engine output. This relates to devices whose temperature is electrically controlled.

(Prior Art) Conventionally, as a technology for controlling the amount of air supplied to the engine to a predetermined intake amount in response to the amount of accelerator operation indicating the required engine output, as shown in Japanese Patent Laid-Open No. 51-138235, an accelerator detection means for detecting the amount of operation; a target air amount setting means for receiving the output of the accelerator detection means and setting a target value of air to be supplied to the engine according to the amount of accelerator operation; and the target air amount setting means. and a throttle valve driving means that receives the output and drives the throttle valve to set the air amount to a target value, and calculates the target air amount (that is, target throttle valve opening r!i) according to the accelerator operation amount, and calculates the target air amount (i.e., target throttle valve opening r!i). It is known that the opening surface of the throttle valve is feedback-controlled to adjust the amount of air. Then, based on this throttle valve opening degree, the air-fuel ratio of the engine is set to the target value by supplying the amount of fuel to the engine so that the air-fuel ratio is set in advance according to the amount of intake air. It is.

(Problems to be Solved by the Invention) By the way, in a conventional engine in which the throttle valve is mechanically linked to the accelerator pedal, the intake air amount characteristic with respect to the accelerator operation amount varies depending on the engine rotational speed, as shown in FIG. The lower the engine speed, the lower the maximum value of the intake air amount, and the point in time when this maximum value is reached is the point at which the lower the engine speed, the smaller the accelerator operation amount. For this reason, for example, when the accelerator operation amount is increased from a low engine speed range in order to accelerate suddenly, the intake air amount is delayed at the beginning of the acceleration due to the delay in increasing the engine speed relative to the increase in the accelerator operation amount. The maximum value at low engine speeds is immediately reached, and the amount of accelerator operation is increased after that)... 1 ″′″″9°′”
＞′>U″″′″″″*t6tr<”7 Air volume did not increase, there was a delay in increasing the output, and the acceleration feeling deteriorated.

-31 The present invention has been made in view of the above points, and its purpose is to provide an engine in which the throttle valve opening degree is electrically controlled with respect to the accelerator operation amount as described above.
To continuously increase and change the intake air amount characteristic with respect to the accelerator operation amount at each engine speed in accordance with the increasing change in the accelerator operation amount, so that it reaches the maximum value at the full accelerator operation amount ( For example, see Fig. 8), the increase in intake air amount responds well to the increase in accelerator operation H even in the low engine speed range, and the accuracy of controlling the intake air amount is improved regardless of the engine speed. be.

(Means for solving the problem) In order to achieve the above object, the solving means of the present invention is as follows:
As shown in the figure, an accelerator detection means 16 for detecting the amount of accelerator operation and an engine rotation speed detection means 22 for detecting the engine rotation speed are provided. In response to the output of 22, the target value of the air supplied to the engine is determined by the engine speed at that time -4 The maximum intake amount that is constant becomes the target intake amount when the accelerator is fully operated, and the accelerator operation amount decreases. a target intake air amount setting means 30 that sets the target intake air amount based on the accelerator operation amount-target intake air amount characteristic, and a throttle valve that receives the output of the target intake air amount setting means 30 and sets the intake air amount to the target value. This configuration includes a throttle valve driving means 31 for driving the throttle valve.

(Function) With the above configuration, in the present invention, the throttle valve opening is set such that even at the same engine speed, the intake air amount does not reach the maximum early as the accelerator operation amount increases, but gradually increases until the accelerator operation amount is full. By controlling the engine speed, the increase in intake air volume responds favorably to the increase in accelerator operation even in the low engine speed range, and the precision in controlling the intake air amount improves regardless of the engine speed. be.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows the overall configuration of an engine control device according to an embodiment of the present invention, where 1 is a four-cylinder engine, for example, and 2 is an engine with one end connected to the atmosphere via an air cleaner 3 and the other end connected to the engine 1. An intake passage 4 supplies intake air (air) to the engine 1, and an exhaust passage 4 has one end open to the engine 1 and the other end opened to the atmosphere to discharge exhaust gas from the engine 1.

Reference numeral 5 indicates an accelerator pedal that is pressed down in response to engine output requirements, and reference numeral 6 indicates a throttle valve that is disposed in the intake passage 2 and controls the amount of intake air. There is no linkage relationship, and as will be described later, it is electrically controlled by the amount of depression of the accelerator pedal 5, that is, the amount of accelerator operation.

Reference numeral 7 denotes a throttle actuator comprising a step motor or the like that opens and closes the throttle valve 6.

8 is a catalyst v4 installed in the exhaust passage 4 for purifying exhaust gas.

Reference numeral 9 denotes a fuel injection valve disposed downstream of the throttle valve 6 in the intake passage 2 to inject and supply fuel. The fuel tank 13 is connected to the fuel tank 13 through the fuel tank 13, and fuel is supplied from the fuel tank 13, and the surplus fuel is returned to the fuel tank 13 through a return passage 15 with a fuel pressure regulator 14 interposed therebetween.
Therefore, fuel at a predetermined pressure is supplied to the fuel injection valve 9.

In addition, 16 is an accelerator pedal position sensor as an accelerator detection means for detecting the amount of depression of the accelerator pedal 5, that is, the accelerator operation amount θACC, and 17 is disposed upstream of the throttle valve 6 in the intake passage 2 to detect the amount of intake air. An air meter 70, 18 is an intake air temperature sensor that is also arranged upstream of the throttle valve 6 in the intake passage 2 and detects the intake air temperature, 19 is a throttle position sensor that detects the same of the throttle valve 6, and 20 is an engine cooling water sensor. It is a water temperature sensor that detects temperature, and the detected values of these 16 to 20 are inputted to a control unit 21 consisting of an analog computer or the like, and the control unit 21 controls the throttle actuator 7 and the fuel injection valve 9. Ru. Furthermore, an igniter 22 is connected as an input to the control unit 21,
A signal indicating the number of ignitions, that is, the engine rotational speed Ne is input. Further, a dust distributor 23 and a battery 24 are connected as inputs to the control unit 21, and receive signals of ignition timing and battery voltage, respectively.

As shown in FIG. 3, the control unit 21 includes a CPU 26, a ROM 27, and a RAM 28, which receive output signals from the accelerator pedal position sensor 16, throttle position sensor 19, and igniter 22 via an input interface 25. , and a throttle actuator drive circuit 29 that drives the throttle actuator 7 in forward or reverse rotation. As shown in FIG. 6, the ROM 27 stores in advance a target intake air amount map in which the accelerator operation amount-target intake amount characteristic is three-dimensionally drawn according to the engine speed. Target intake air volume characteristic -8= is when the accelerator is fully operated (70° in terms of accelerator depression angle)
The target air intake amount is set to the maximum intake amount determined by the engine speed at that time, that is, the target air amount is set to decrease as the engine speed decreases, and the target air amount decreases from the above maximum value as the accelerator operation amount decreases. It is set to gradually decrease. Similarly, as shown in FIG. 7, the ROM 27 stores a target throttle valve opening degree map that increases in accordance with the engine rotational speed and the target filling amount per engine rotation.

Further, as shown in FIG. 4, the CPU 26 includes a first calculation section 26a and a second calculation section 26b.
6a calculates the target intake air amount Qao8J from the target air intake amount map shown in FIG. The second calculation unit 26b calculates the target throttle valve opening from the target throttle valve opening map shown in FIG. This is to calculate THosJ.

Next, the first and second calculation units 26a of the CPU 26,
5<A) and (
This will be explained based on the flowchart of B). After starting and initializing in step S1, step S
2, the target intake air fiQaos,r is determined from the target intake air amount map shown in FIG. 6 based on the accelerator operation amount θACC signal from the accelerator pedal position sensor 16 and the engine rotational speed Ne signal from the igniter 27.

Next, in step S3, the target intake air IQaoe,r obtained in step S2 is divided by the engine rotation speed Ne to obtain the target charge amQAVC per engine revolution, and in step S4, the target charge amount amQAVC obtained in step S2 is calculated. Based on the QAVC and the engine speed Ne, the target throttle valve opening degree T)+08J is determined from the target throttle valve opening degree map shown in FIG. 7, and the process returns to step S2.

Then, a time interrupt is made in the middle of the repetition of steps $2 to S4, and after inputting the actual throttle valve opening THR signal from the throttle position sensor 19 in step SA, the actual throttle valve opening THR signal is inputted in step sB.
Compare THR and target throttle valve gap THOBJ, and if THR<Tl-108J, step S
At c, the throttle actuator drive circuit 29 is commanded to rotate in the throttle valve opening direction and returns, while at T
If HR>THoJB (No), the throttle actuator drive circuit 29 is commanded to rotate in the throttle valve closing direction in step SD, and the process returns.

Therefore, in the operation flow of the control unit 21, in step S2, the outputs of the accelerator position sensor 16 and the igniter 22 are received, and the target value of air to be supplied to the engine is set to the maximum flit' determined by the engine speed at that time. ″m [1h<
7 'y t /L/ + m N″′″′o@fl@
'Atl@-o.

The target intake air amount setting means 30 is configured to set the target intake air amount based on an accelerator operation amount-target intake air amount characteristic in which the target intake air amount decreases as the accelerator operation amount decreases. Further, in steps SA to SD, the output of the target intake air amount setting means 30 is received, and the throttle valve 6 is driven so that its opening becomes the target throttle valve opening THOBJ in order to set the intake amount to the target value. Throttle valve drive means 31
It consists of

Therefore, in the above embodiment, for the accelerator operation amount-target intake amount characteristic at each engine speed in the target intake air amount map shown in FIG. 6, the maximum intake amount determined by the engine speed at that time is The target intake amount is the target intake amount when the amount of operation is full, and the target intake amount is given a characteristic that gradually decreases as the amount of accelerator operation decreases. Since the target intake air amount is set at the accelerator operation amount, as shown in FIG.
i□′t x ′″/′:zlFD rotation number″ does not matter.

increases gradually without reaching the maximum value early, which is determined by the engine speed when the accelerator = 12
- Responds well to increases in the amount of control operations. As a result, the engine output increases smoothly in accordance with the increase in the amount of accelerator operation, resulting in a good acceleration feeling. Therefore, it is possible to improve the control accuracy of the intake air amount with respect to the accelerator operation amount, and in turn, it is possible to improve the acceleration feeling.

(Effects of the Invention) As explained above, according to the present invention, the amount of air supplied to the engine is gradually increased in accordance with the increase in the amount of accelerator operation even when accelerating from a low engine speed range, and Since the engine is designed to better respond to increases in the amount of operation, the accuracy of controlling the intake air amount relative to the amount of accelerator operation is improved regardless of the engine speed, which in turn increases engine output smoothly and improves the feeling of acceleration. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIGS. 2 to 8 show embodiments of the present invention, FIG. 2 is a general schematic diagram, and FIG. 3 is a diagram showing the internal configuration of the control unit. , Figure 4 is a diagram showing the internal configuration of the CPU, Figure 5 (A>,
(B) is a flowchart diagram for explaining the operation of the control unit, FIG. 6 is a diagram showing a target intake air amount map stored in the ROM, and FIG. 7 is a diagram showing the target throttle valve opening map. FIG. 8 is a characteristic diagram of the intake air amount with respect to the accelerator operation amount, showing the features of the present invention. FIG. 9 is a diagram showing the intake air amount characteristics with respect to the accelerator operation amount in an engine in which the throttle valve is mechanically linked to the accelerator pedal. 1...Engine, 5...Accelerator pedal, 6...
Throttle valve, 7... Throttle actuator, 1
6...Accelerator pedal position sensor, 22...
Igniter, 30...Target intake air amount setting means, 31...
- Throttle valve drive means. Patent Applicant Mazda Motor Corporation Representative Patent Attorney 1) Hiroshi (TliiltIH61-11J6134 (6) 凃区■ Aji V 猷郎Fig. 6 (r, p, m) Engine reloading (Ne) Product Fig. 7 . Snake engine rotation number (Ne)

Claims (1)

[Claims] (1) Accelerator detection means for detecting the amount of accelerator operation;
engine rotation speed detection means for detecting engine rotation speed;
Upon receiving the outputs of the accelerator detecting means and the engine speed detecting means, a target value of air to be supplied to the engine is determined, and the maximum intake amount determined by the engine speed at that time becomes the target intake amount when the accelerator is fully operated; a target air amount setting means that sets the target intake air amount based on an accelerator operation amount-target intake amount characteristic in which the target intake air amount decreases as the accelerator operation amount decreases; 1. A throttle valve control device for an engine, comprising: a throttle valve driving means for driving a throttle valve.