JP2515980B2 - Engine throttle valve control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a throttle valve control device for an engine that detects an operation amount of an accelerator pedal as an electric signal and controls opening / closing of a throttle valve based on the signal.

(Prior Art) In recent years, along with the spread of computer control systems for engines and the spread of constant-speed traveling devices, the throttle pedal opening / closing control is not directly performed via a mechanical link mechanism, but an accelerator pedal is used. There is one in which the operation amount of is converted into an electrical signal and the operation is performed based on this signal. JP53-1279
No. 23, gazette discloses a throttle valve control device of this type. In the device described in this publication, the stroke (depression amount) of the accelerator pedal is detected using a stroke sensor as a parameter indicating an acceleration request, and the throttle valve is opened / closed so that acceleration corresponding to this signal can be obtained. We are in control.

(Problems to be Solved by the Invention) However, in such a device that handles the operation amount of the accelerator pedal as an acceleration request, if the accelerator pedal is depressed, there is always an acceleration request corresponding to the operation amount. I will judge it as something. Under such control, even if the accelerator pedal is slightly depressed, the vehicle speed increases at a predetermined acceleration. Therefore, in order to maintain the constant speed traveling state, the accelerator pedal is preferably depressed. Otherwise, the vehicle speed will rise excessively. Further, even if the accelerator pedal has the same amount of depression, the driver's acceleration demand tends to be greater as the vehicle speed is lower, and conversely, as the vehicle speed is greater, the driver's acceleration demand tends to be smaller. Driving is not smooth.

It is an object of the present invention to provide an engine throttle valve control device that solves such problems.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, the acceleration request amount is determined in consideration of the operation amount of the accelerator pedal and the actual vehicle speed, and the acceleration request amount is set to the acceleration request amount. Accordingly, the opening / closing control of the throttle valve is performed.

Referring to FIG. 1, a throttle valve control device for an engine according to the present invention requires an accelerator position detecting means B for detecting an operation amount of an accelerator pedal A, and a vehicle request based on the detected accelerator pedal operation amount ACPb. Acceleration calculating means C for calculating the acceleration α1 and vehicle speed detecting means D for detecting the vehicle speed
And the output of the vehicle speed detection means, the required acceleration α1
And a correction means E for calculating the final acceleration α3,
A throttle opening calculation means F for calculating a throttle opening THO based on the calculated final acceleration α3, and a throttle valve H so that the calculated throttle opening THO is obtained.
And a throttle valve opening / closing means G for performing opening / closing control of the above.

(Operation) In the above-described first calculating means C, the first required acceleration α1 that increases / decreases according to the increase / decrease in the operation amount of the accelerator pedal is calculated. An example of this is shown in FIG. On the contrary,
In the correction means E, for example, as shown in FIG.
The second required acceleration α2 having the characteristic of increasing / decreasing in the opposite direction to the increasing / decreasing vehicle speed is calculated. The correction means E can be configured to have, for example, an adder function, and as shown in FIGS. 2 and 3, the first and second required accelerations α1 and α2 calculated according to the operation amount and the vehicle speed. Is added to calculate the final acceleration α3. As a result, the calculated third required acceleration α3 becomes smaller as the vehicle speed increases, even if the accelerator pedal operation amount is the same, as shown in FIG. 4, for example. The final acceleration α3 having such characteristics is supplied to the throttle opening control means F. In this means, the throttle opening THO is calculated from the supplied value α3 in consideration of the operating conditions. Then, the opening degree of the throttle valve is controlled by the throttle opening / closing means G so that the throttle opening degree THO is obtained.

(Effects of the Invention) In the present invention thus configured, the operation amount of the accelerator pedal is taken in as the required acceleration, this value is corrected according to the vehicle speed to obtain the final acceleration, and based on this value, the throttle valve Open / close control is performed. Therefore, even if the pedaling amount is the same, the value of the aerodynamic acceleration is set to be larger as the vehicle speed is smaller, and is set to be smaller in the opposite case, so that the drivability suitable for the driving property of the driver is realized. As a result, steady running stability is also improved.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 2 to 8.

FIG. 5 is a diagram showing the overall configuration of an engine to which the present invention is applied. As shown in the figure, an air cleaner 5, an air flow meter 7, and a throttle valve 9 are arranged in the intake passage 3 connected to the engine body 1, and a fuel injection valve 13 is arranged in the vicinity of the intake port 11. There is. This injection valve
The fuel is supplied to 13 by a fuel supply system including a fuel tank 15, a fuel pump 17, a fuel filter 19, a pressure adjusting valve 21 and the like. The opening and closing of the throttle valve 9 is performed by the step motor 23, and the drive control of the step motor 23 is performed by the control unit 25.
Done by The input side of the control unit 25 is connected to sensors such as an accelerator position sensor 27, a throttle opening sensor 29 and a vehicle speed sensor 31. The accelerator position sensor 27 electrically detects the operation amount of the accelerator pedal 33, that is, the depression amount, and the throttle opening sensor 29 detects the actual opening of the throttle valve 7. Further, the vehicle speed sensor 33 is for detecting the vehicle speed V. Any of these sensors may have a known structure. On the other hand, the output side of the control unit is connected to the step motor 23.

As shown in FIG. 6, the above control unit 23
Can be composed of, for example, a one-chip microcomputer, and has a central processing unit CPU, a read-only memory ROM, and a random access memory RAM. Sensor output supplied to the control unit ACOb, THO,
V is digitized by the .A / D converter. The ROM stores a control program, which will be described later, a conversion table for converting the output of the accelerator position sensor into the first required acceleration, a table for calculating the second required acceleration from the vehicle speed, and the like.

Next, FIG. 7 is a flowchart showing the throttle valve opening / closing control of this example, and FIG. 8 is a diagram showing a procedure for calculating the throttle opening degree from the final required acceleration. The operation of this example will be described with reference to these figures.

First, in FIG. 7, in step ST1, various sensor output values are read. The read accelerator pedal depression amount ACPb, vehicle speed V, and engine speed N are stored in the RAM. In step ST2, the required acceleration α11 of the vehicle is calculated from the read value ACPb. This calculation is performed using the conversion table stored in the ROM and having the characteristics shown in FIG. In step ST3, the second required acceleration α2 is calculated from the read value V. This calculation is performed using the conversion table stored in the ROM and having the characteristics shown in FIG. In step ST4, the calculated required acceleration α
The final acceleration α3 is calculated by adding 1 and α2. Calculated final acceleration α3 and accelerator pedal depression amount AC
The relationship with Pb is shown in FIG. As shown in this figure, the vehicle speed is 0 to 30 km even if the pedaling amount is the same value x1.
Increasing to / h will decrease the final acceleration from the values y4 to y1.

Next, in step ST5, the calculated final acceleration α3
The throttle opening is calculated based on This calculation procedure will be described with reference to FIG. This calculation is performed according to the power train model. The following calculations are based on the assumption of manual transmission.
First, using the final acceleration α3 and the vehicle speed V, the block ST
The driving wheel required horsepower HpT is calculated by the arithmetic expression shown in 51. In this formula, K1 is a constant determined from the equivalent inertial mass of the vehicle. Next, as shown in block ST52,
The calculated value HpT is the reciprocal of the transmission efficiency of the transmission.
Calculate the required horsepower HpE of the engine by multiplying (K _TM ) ^-1 . After that, as shown in block ST53, the throttle opening THO is calculated using a characteristic diagram showing the relationship between the calculated value HpE, the engine viewpoint number N, and the throttle opening THO.

Next, after the throttle opening THO is calculated in this way, the process proceeds to step ST6 in FIG. 7 to drive the step motor 9 to open and close the throttle valve 7 so that the calculated throttle opening is achieved.

In the above control, if the actually obtained acceleration is feedback-controlled, it is possible to perform suitable acceleration control without being influenced by the fluctuation of the traveling condition.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, and FIG.
FIG. 3 is a characteristic diagram showing the relationship between the required acceleration and the accelerator pedal depression amount, FIG. 3 is a characteristic diagram showing the relation between the second required acceleration and the vehicle speed, and FIG. 4 is a characteristic showing the relation between the final acceleration and the accelerator pedal depression amount. 5 and 5 are schematic configuration diagrams showing the overall configuration of an engine to which the present invention is applied, FIG. 6 is a block diagram showing a control system of the apparatus of FIG. 5, and FIG. 7 is an operation of the apparatus of FIG. The flowchart shown in FIG. 8 is a block diagram showing the procedure for calculating the throttle opening. A ... Accelerator pedal B ... Accelerator position detection means C ... Acceleration calculation means D ... Vehicle speed detection means E ... Correction means F ... Throttle opening calculation means G ... Throttle opening / closing means H ... Throttle valve ACPb ... … Depression amount α1 …… Vehicle required acceleration α2 …… Second required acceleration α3 …… Final acceleration THO …… Throttle opening

Claims (1)

(57) [Claims] 1. An accelerator position detecting means for detecting an operation amount of an accelerator pedal, an acceleration setting means for obtaining a required acceleration of a vehicle from the detected operation amount of the accelerator pedal, and a vehicle speed detecting means for detecting a current vehicle speed. Receiving the output of the vehicle speed detection means, the requested acceleration is corrected to a smaller value as the current vehicle speed is higher, and a correction means for calculating a final acceleration, and a throttle opening degree is calculated based on the calculated final acceleration. An engine throttle valve control device comprising: throttle opening calculation means; and throttle valve opening / closing means for controlling opening / closing of a throttle valve so that the calculated throttle opening is achieved.