JPH0584385B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a device for controlling the opening of a throttle valve in an internal combustion engine for a vehicle.

[Prior art]

In conventional vehicle internal combustion engines, for example, the fourth
As shown in the figure, the accelerator pedal 30 and the throttle valve 31 are directly mechanically connected via a wire 32, etc., and the amount of operation (depression amount) of the accelerator pedal 30 is usually the amount of adjustment of the throttle valve 31. It is.

In addition, as described in Published Patent Publication No. 107925 of 1982, the amount of operation of the accelerator pedal is electrically detected and fuel is supplied accordingly, so that the amount of air commensurate with the amount of fuel is supplied. There is also known a device that controls the opening of the throttle valve to supply the engine with a mixture corresponding to the operation of the accelerator pedal.

In addition, as described in Published Patent Publication No. 43626 of 1975, a target vehicle speed is set according to the amount of operation of the accelerator pedal, and the throttle valve opening is controlled so that the actual vehicle speed matches the target vehicle speed. Devices that do this are also known.

However, in the conventional throttle control devices as described above, the throttle valve opening degree is controlled using the operation amount of the accelerator means as the main variable, and therefore, the following problems occur.

[Problems to be solved by the invention] As mentioned above, in the conventional throttle control device, if the driver operates the accelerator, the engine output is generated according to the amount of operation. Even if the driving force is so great during cornering that the vehicle reaches its limit and skids, as long as the driver operates the accelerator, the driving force will be applied, and the vehicle will reach its limit. There was a problem in that there was a risk that the car could skid if it crossed the road, causing it to go far off the course or even spin out.

The present invention aims to solve the problems of the prior art as described above.

[Means to solve the problem]

In order to achieve the above object, in the present invention, the lateral acceleration of the vehicle and the road surface condition are detected, a limit value is set according to the road surface condition, and the lateral acceleration is The throttle valve opening is configured to be limited so as not to exceed a limit value.

This will be explained in detail below.

FIG. 1 is a block diagram illustrating the functionality of the present invention.

In FIG. 1, the operation amount detection means 1 detects the operation amount of an accelerator means (an accelerator pedal operated by the foot, an accelerator lever operated by the hand, etc.), and for example, an analog sensor according to the amount of depression of the accelerator pedal. It is a potentiometer that outputs a signal.

Further, the target throttle valve opening degree setting means 2 sets the target throttle valve opening degree using the above operation amount as a main variable.

The target throttle valve opening can be set, for example, by setting the target throttle valve opening in a manner that uniquely corresponds to the operation amount of the accelerator, or by setting a target vehicle speed corresponding to the operation amount. Various methods can be considered, such as a method of setting the target throttle valve opening depending on the deviation between the target vehicle speed and the actual vehicle speed.

Next, the lateral acceleration detection means 3 detects the lateral acceleration of the vehicle, and is, for example, a semiconductor G sensor.

The limiting means 8 is a means for limiting the target throttle valve opening so that the above-mentioned lateral acceleration does not exceed the limit value set by the below-described limit value setting means 7. For example, the actual lateral acceleration is a limit value. If the value is exceeded, the target throttle valve opening degree is reduced.

The drive means 5 is for adjusting the opening degree of the throttle valve according to the target throttle valve opening degree limited by the above-mentioned limiting means 4, and is composed of, for example, a drive circuit and a servo motor.

The road surface condition detection means 6 is means for detecting the condition of the road surface, that is, whether the road surface is in a non-slip condition such as a paved road, or in a slippery condition such as a muddy or snowy road. This is a road surface condition detection device (for example, Patent Application No. 130985 of 1982) that detects road surface conditions.

Next, the limit value setting means 7 is a means for setting different limit values depending on the road surface condition detected by the road surface condition detecting means 6, that is, whether the road surface is slippery or not.

As mentioned above, in the device shown in Figure 1, the throttle valve opening is limited so that the lateral acceleration of the vehicle does not exceed the limit value, so when a large lateral acceleration that is likely to cause the vehicle to skid occurs, Since the engine output is reduced and the driving force is reduced, it is possible to control the vehicle so that sideslip does not occur any more, thereby improving the safety of the vehicle.

In addition, since it is configured to set the limit value of lateral acceleration according to the road surface condition, it is possible to perform more accurate control corresponding to the road surface condition.
It is possible to improve both drivability and safety during driving.

In FIG. 1, the target throttle valve opening setting means 2, limit value setting means 7, and limiting means 8 can be constructed by a microcomputer including a CPU, RAM, ROM, etc.

[Embodiments of the invention]

FIG. 2 is a diagram showing an embodiment of the present invention.

In FIG. 2, a road surface condition detection device 10 is a device for detecting a road surface condition, for example, a friction coefficient μ of a road surface, and is, for example, a road surface condition detection device using the above-mentioned ultrasonic waves.

The lateral acceleration detection sensor 11 is a sensor that detects the lateral acceleration of the vehicle, and uses, for example, a semiconductor G sensor.

Further, the potentiometer 12 detects the operation amount (depression amount) of the accelerator pedal 13 and outputs it as an analog voltage.

The signals of the road surface condition detection device 10, the lateral acceleration detection sensor 11, and the potentiometer 12 are transmitted directly or, if necessary, to the AD converter 1.
4 to the microcomputer 15.

The microcomputer 15 performs calculations as described below to set the target throttle valve opening, and outputs the result via the DA converter 16.

On the other hand, a servo motor 23 is attached to one end of the rotating shaft 20 of the throttle valve 18.

Also, a lever 2 fixed to the other end of the rotating shaft 20
A return spring 22 is installed between the throttle valve 1 and the fixed point to bias the throttle valve 18 in the fully closed direction.

Then, the signal corresponding to the target throttle valve opening degree outputted from the DA converter 16 is amplified by the drive circuit 17 and then applied to the servo motor 23 to drive the servo motor 23 to rotate by a predetermined angle.

Further, a potentiometer 24 that generates a signal corresponding to the rotation angle of the servo motor 23 is attached to the servo motor 23, and the signal of this potentiometer 24 is fed back to the microcomputer 15 via the AD converter 14. Servo motor 2
3, that is, the opening degree of the throttle valve 18 is controlled so that it matches the target throttle valve opening degree.

Next, the contents of calculations performed by the microcomputer 15 will be explained.

FIG. 3 is an embodiment of a flowchart showing the above calculation, and this calculation is repeatedly performed at a predetermined timing.

In FIG. 3, first, in P8, the road surface μ signal, that is, the signal of the road surface condition detection device 10 is read.

Next, the lateral acceleration G of the vehicle is read at P1.

Next, in P9, the road surface μ representing the above road surface condition is
Calculate the limit value Gμ corresponding to the signal.

Next, in P10, it is determined whether the lateral acceleration G is larger than the limit value Gμ corresponding to the above road surface condition.

If NO in P10, the lateral acceleration is below the limit value, so the process goes to P3 and reads the accelerator stroke, that is, the amount of depression of the accelerator pedal.

Next, in P4, the target throttle valve opening degree is calculated using the above-mentioned accelerator stroke as the main variable, and it is output.

On the other hand, if P10 is YES, that is, if the actual lateral acceleration G is larger than the limit value Gμ, P5
to determine whether the engine speed is increasing.

If P5 is YES, that is, if the engine speed is increasing, there is a risk of skidding.
Go to P6 and output a command signal to close the throttle valve.

If NO in P5, this indicates that the engine speed is not increasing any further, so the process goes to P7 and outputs a command signal to hold the throttle valve.

Note that there are various methods for calculating the target throttle valve opening in P4, such as a method that sets the target throttle valve opening according to only the accelerator stroke as described above, and a method that sets the target throttle valve opening according to the accelerator stroke and the actual vehicle speed. be.

〔Effect of the invention〕

As explained above, in the present invention, the engine output is limited so that the lateral acceleration of the vehicle does not exceed a limit value, so that the vehicle skids while cornering, goes off the course, or spins. It is possible to prevent this from occurring and improve driving safety.

In particular, since the configuration is such that the limit value of lateral acceleration changes depending on the road surface conditions, it is possible to perform more accurate control corresponding to the road surface conditions, improving both safety and drivability. It becomes possible to improve the performance.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the functions of the present invention, Figure 2 is a block diagram showing the functions of the present invention.
The figure shows an embodiment of the present invention, FIG. 3 shows an embodiment of a flowchart showing calculations in the present invention, and FIG. 4 shows an example of a conventional device. Explanation of symbols, 1... Operation amount detection means, 2... Target throttle valve opening setting means, 3... Lateral acceleration detection means, 4... Limiting means, 5... Driving means,
6...Road surface condition detection means, 7...Limit value setting means, 8...Limiting means.

Claims (1)

[Claims] 1. Operation amount detection means for detecting the operation amount of the accelerator means, target throttle valve opening setting means for setting the target throttle valve opening using the operation amount as a main variable, and lateral acceleration for detecting the lateral acceleration of the vehicle. a detection means, a road surface condition detection means for detecting the road surface condition, a limit value setting means for setting a limit value according to the road surface condition, and a means for preventing the above-mentioned lateral acceleration from exceeding the above-mentioned limit value according to the road surface condition. a limiting means for limiting the target throttle valve opening, and a driving means for driving the throttle valve so as to match the limited target throttle valve opening. A throttle control device for a vehicle, characterized in that it controls engine output so as not to exceed a limit value that changes depending on the engine output.