JPH0727387Y2 - Throttle valve control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Field of Industrial Application] The present invention relates to an engine throttle valve control device.

[Prior Art] Conventionally, the movement of the accelerator pedal is taken out as an electric signal, the actuator is operated by this electric signal to electrically open and close the throttle valve, and the throttle valve opening characteristic is set to a predetermined characteristic. It is known that

Further, there is also proposed a throttle valve opening characteristic that controls opening / closing of the throttle valve such that the throttle valve opens larger as the slope of the road is larger when the vehicle starts on an uphill road to reduce mistakes in starting the vehicle on a slope. Yes (Actual Kaisho 59
-45247).

[Problems to be Solved by the Invention] However, with such a conventional throttle valve control device, it is possible to reduce start mistakes when starting on an uphill road.
When the vehicle is traveling, for example, on a long uphill road that the driver cannot perceive as an uphill road, if the accelerator pedal depression amount is constant, the vehicle speed decreases. Therefore, in order to keep the vehicle speed constant, the accelerator pedal is operated to open the throttle valve to increase the output of the engine, but the driving vehicle may experience the illusion that the power performance of the engine is insufficient. Also, on downhill roads, the vehicle speed increases, so once you stop pressing the accelerator pedal, use engine braking, and if the vehicle speed drops too much, this time consciously operate the accelerator pedal delicately to reduce the vehicle speed. Try to keep
Further, there is a problem that if the acceleration is not enough, the amount of depression of the accelerator pedal must be delicately reduced to frequently repeat the operation for keeping the vehicle speed constant.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a throttle valve control device which solves the above-mentioned problems and which improves the drivability by improving the operability of the accelerator pedal in response to changes in the inclination of the road surface.

Configuration of the Invention [Means for Solving the Problems] In order to achieve the above object, the present invention has the following configurations as means for solving the problems. That is, as illustrated in FIG. 1, an accelerator opening degree detecting means M1 for detecting an accelerator opening degree according to a depression amount of an accelerator pedal, an inclination detecting means M2 for detecting an inclination of a road surface, and a valve for opening and closing a throttle valve. When the slope of the road surface detected by the slope detection means M2 during traveling is an uphill road while traveling, with respect to the accelerator opening detected by the accelerator opening detection means M1 according to the slope. When the opening of the throttle valve is large and the inclination of the road surface detected by the inclination detecting means M2 is a downhill road, the valve is opened so that the opening of the throttle valve becomes smaller than the accelerator opening according to the inclination. Opening and closing means
That is the configuration of a throttle valve control device characterized by including a valve opening / closing control means M4 for controlling M3.

[Operation] In the throttle valve control device having the above configuration, the accelerator opening detection means M1 detects the accelerator opening degree according to the depression amount of the accelerator pedal, the inclination detection means M2 detects the inclination of the road surface, and the valve opening / closing control is performed. Means M4, while running, when the slope of the road surface detected by the slope detection means M2 is an uphill road, the throttle valve of the throttle valve with respect to the accelerator opening detected by the accelerator opening detection means M1 according to the inclination. When the opening is large and the inclination of the road surface detected by the inclination detecting means M2 is a downhill road, the opening of the throttle valve is made smaller with respect to the accelerator opening according to the inclination to open / close the valve opening / closing means.
Control M3. Therefore, the accelerator operability is improved and the drivability is improved.

[Embodiment] An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a throttle valve control device according to an embodiment of the present invention. This throttle valve control device includes an accelerator opening detection sensor 2 that generates an accelerator opening signal corresponding to the amount of depression of an accelerator pedal 1, and a signal corresponding to a positive inclination θ when the road surface slopes uphill. It is provided with an inclination detection sensor 4 which generates a signal corresponding to the negative inclination θ when the vehicle is traveling downhill. This tilt detection sensor 4
Is a gradient θ obtained by removing the acceleration component due to the increase / decrease in vehicle speed from the detected acceleration using an accelerometer (not shown).
The signal may be generated in accordance with the above, or the inclination may be detected by converting it into the inclination θ of the road surface based on the change in atmospheric pressure during traveling and a constant traveling distance. Further, the inclination may be detected by converting it to the inclination θ of the road surface based on the vehicle height corresponding to each wheel. In the present embodiment, the inclination θ is expressed as a percentage of the horizontal distance with respect to the vertical distance.

Further, the intake system is provided with a motor 8 as a valve opening / closing means for opening / closing the throttle valve 6. A solenoid may be used instead of the motor 8.

The accelerator opening detection sensor 2, the inclination detection sensor 4, and the motor 8 are each connected to an electronic control circuit. This electronic control circuit is configured with a well-known CPU 12, ROM 14, RAM 16 as the center of a logical operation circuit, and an input / output circuit for performing input / output with the outside, here, a sensor input circuit 18, a drive circuit 20, etc. via a common bus 22. Are connected to each other.

The CPU 12 inputs signals from the accelerator opening detection sensor 2 and the inclination detection sensor 4 via the sensor input circuit 18, and based on these signals, the data in the ROM 14 and the RAM 16, the CPU 12
Outputs a drive signal for driving the motor 8 via the drive circuit 20. Further, in the ROM 14, as shown in FIG. 3 (a), a map MAP1 according to a graph showing the throttle opening on the vertical axis and the accelerator opening on the horizontal axis, as shown in FIG. 3 (b). , A map MAP2 according to a graph showing characteristics that a larger throttle opening is obtained at the same accelerator opening as shown in the map MAP1, and an accelerator opening shown in map MAP2 as shown in FIG. 3 (c). A map MAP3 corresponding to a graph showing a characteristic that a larger throttle opening is obtained at the same accelerator opening is stored in advance. Also, FIG. 3 (d)
A map MAP4 according to a graph showing a characteristic that a smaller throttle opening is obtained at the same accelerator opening as shown in map MAP1, as shown in FIG. 3 (e). A map MAP5 corresponding to a graph showing a characteristic that the throttle opening is smaller at the same accelerator opening as the accelerator opening is stored in advance. Further, in addition to these maps MAP 1, 2, 3, 4, 5, a large number of maps corresponding to a graph showing the characteristics of the optimum accelerator opening and throttle opening according to the inclination of the road surface to be described later are stored. ing.

Next, the processing performed by the electronic control circuit described above will be described with reference to the flowchart of FIG.

The throttle valve control apparatus executes the throttle valve control routine shown in FIG. 4 together with other control routines when a Keith switch (not shown) is turned on. First,
During traveling of the vehicle, the accelerator opening a detected by the accelerator opening detection sensor 2 according to the amount of depression of the accelerator pedal depressed by the driver is read through the sensor input circuit 18 (step 100). Next, the tilt detection sensor 4
The inclination θ of the traveling road surface detected by is read through the sensor input circuit 18 (step 110). Then, when the read inclination θ is within the range of −0.5% to 0.5% (step 120), that is, when the road is almost flat, the optimum accelerator opening on the flat road stored in the ROM 14 is set. The map MAP1 having the characteristics of the throttle opening is read (step 130), and based on this map MAP1,
The throttle opening b is determined with respect to the accelerator opening a read by executing the processing of step 100, and the motor 8 is driven via the drive circuit 20 so as to be the throttle opening b (step 140).

On the other hand, if the read inclination θ is not within the range of −0.5% to 0.5% (step 120) and the inclination θ is positive (step 150) and is 1% or less (step 160), that is, it is gentle. If it is a rough uphill road, the map MAP2 having the characteristics of the optimum accelerator opening and throttle opening on a gentle uphill road stored in the ROM 14 is read (step 17).
0). Based on this map MAP2, the throttle opening b is determined with respect to the accelerator opening a read by executing the processing of step 100, and the throttle opening b is set to this throttle opening b.
The motor 8 is driven via the drive circuit 20 (step 14
0). Alternatively, if the inclination θ of the uphill is 1% to 1.5% (step 180), the map MAP3 having the optimum accelerator opening and throttle opening characteristics on the uphill of the inclination θ stored in the ROM 14 Is read (step 170), the throttle opening b is determined with respect to the accelerator opening a read by executing the processing of step 100 based on this map MAP3, and the drive circuit 20 is set to this throttle opening b.
The motor 8 is driven via (step 140). Also,
Although illustration is omitted, when the inclination θ is 1.5% or more, similarly, the motor 8 is driven based on the map stored in advance according to the inclination θ. As described above, when the vehicle is traveling on an uphill road, the opening characteristic of the throttle valve is increased with respect to the accelerator opening a according to the inclination θ.

Alternatively, the inclination θ is negative (step 150) and -1%
If the above is the case (step 200), that is, if it is a gentle downhill road, the map MAP4 having the characteristics of the optimum accelerator opening and throttle opening on the gentle downhill road stored in the ROM 14 is read (step 200). 210). Based on this map MAP4, the throttle opening b with respect to the accelerator opening a read by executing the processing of step 100 is determined, and the motor 8 is driven via the drive circuit 20 so as to be this throttle opening b ( Step 140). Alternatively, when the slope θ of the downhill is within the range of -1% to -1.5% (step 220), the optimum accelerator opening and throttle opening on the downhill of the slope θ stored in the ROM 14 are set. Load map MAP5 with characteristics (step 230) and use this map MAP5
Based on the above, the throttle opening b with respect to the accelerator opening a read by executing the processing of step 100 is determined, and the motor 8 is driven via the drive circuit 20 so as to be the throttle opening b (step 140). . Although not shown, when the inclination θ is −1.5% or less, the motor 8 is similarly driven based on the map stored in advance according to the inclination θ. In this way, when the road is downhill,
The opening characteristic of the throttle valve is made smaller with respect to the accelerator opening a according to the inclination θ.

When the motor 8 is driven and the opening of the throttle valve is set to the opening b according to the map, the above-described processing is repeatedly executed. The execution of the processing of steps 120 to 230 works as valve opening / closing control means.

As described above, in the throttle valve control device of the present embodiment, the accelerator opening detection sensor 2 detects the accelerator opening b according to the depression amount of the accelerator pedal 1, and the inclination detection sensor 4 detects the inclination θ of the road surface. When the detected inclination θ is an uphill road (steps 120, 150, 160, 180), the opening b of the throttle valve 6 is increased with respect to the accelerator opening a (steps 170, 190, 140), and when the detected inclination θ is a downhill road. (Steps 150, 200, 220), the opening b of the throttle valve 6 is made smaller than the accelerator opening a (Steps 210, 230, 140).

Therefore, according to the throttle valve control device of the present embodiment, when driving uphill, the accelerator operability is improved so that the throttle opening b is larger than the accelerator opening a, and the engine output is increased to improve the exercise performance. It is possible to improve drivability without causing an illusion that there is a shortage. Further, when the vehicle is traveling downhill, the accelerator operability is adjusted to the throttle opening b with respect to the accelerator opening a.
To improve the controllability of engine output and improve drivability. Further, when applied to a vehicle with an automatic drive mechanism, when the vehicle runs at a constant speed on an uphill road, the accelerator pedal does not move greatly and the driver does not feel uncomfortable, and the driver can drive with the same accelerator pedal operation feeling as usual.

Instead of the map MAP2 described above, a linear accelerator opening and throttle opening having a steeper slope than the relationship between the accelerator opening and the throttle opening shown in map MAP1 as shown in FIG. The map MAP6 corresponding to the graph showing the characteristic having the relationship with the degree, and further the map MAP4 described above are replaced with the accelerator opening and the throttle opening shown in the map MAP1 as shown in FIG. The map MAP7 corresponding to the graph showing the characteristic having the relationship between the linear accelerator opening and the throttle opening having a gentler inclination than the relationship can also be implemented. The same applies to the maps MAP3 and MAP5.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and it goes without saying that the present invention can be implemented in various modes without departing from the scope of the present invention. is there.

Effect of the Invention As described in detail above, the throttle valve control device of the present embodiment has an effect that the accelerator operability can be improved and drivability can be improved according to the inclination while traveling on a slope.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating the basic configuration of the present invention, FIG. 2 is a schematic configuration diagram of a throttle valve control device as one embodiment of the present invention, and FIG. 3 is an accelerator opening and throttle of the present embodiment. FIG. 4 is a graph showing a relationship with the opening degree, FIG. 4 is a flowchart showing an example of a control routine executed in the control circuit of this embodiment, and FIG. 5 is a relationship between the accelerator opening degree and the throttle opening degree as another embodiment. It is a graph which shows. 2 ... Accelerator opening detection sensor 4 ... Inclination detection sensor 6 ... Throttle valve 8 ... Motor 10 ... Electronic control circuit

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. An accelerator opening detection means for detecting an accelerator opening degree according to a depression amount of an accelerator pedal, an inclination detection means for detecting an inclination of a road surface, a valve opening / closing means for opening / closing a throttle valve, and When the inclination of the road surface detected by the inclination detecting means is an uphill road, the opening of the throttle valve is larger than the accelerator opening detected by the accelerator opening detecting means according to the inclination, When the slope of the road surface detected by the detection means is a downhill road,
A throttle valve control device comprising: valve opening / closing control means for controlling the valve opening / closing means so that the opening degree of the throttle valve becomes smaller than the accelerator opening degree according to the inclination.