JPH06248990A - Engine output control device - Google Patents

Abstract

PURPOSE:To realize stable running of a vehicle by a method wherein a control fuel injection amount by auto cruise and a control fuel injection amount, being lower, of traction control fuel injection amounts produces an electronic governor control signal. CONSTITUTION:When an auto cruise control state is produced in a traction control state, an auto cruise control injection amount 6 is decided by a controller for controlling a fuel injection amount. Further, from an ASR accelerator opening 2, an ASR control injection amount 8 is determined and a control fuel injection amount, being lower, of the ARS control injection amount and the auto cruise control injection amount 6 is decided. A fuel injection amount, being higher, of a fuel injection amount, being lower, of the control injection amounts 6 and 8 and a fuel injection amount 5 is inputted as an electronic governor control signal 7 to an engine. When a wheel slip occurs during control of auto cruise, since the ASR control injection amount 8 is usually lower than the auto cruise control injection amount 6, traction control is rendered effective. This constitution causes prevention of a slip and repetition of convergence and execution of stable running of a vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine output control device, and more particularly to an engine output device for performing traction control by controlling a fuel injection amount.

[0002]

2. Description of the Related Art FIG. 3 schematically shows a conventionally known engine output control system for performing traction control. In this system, two controllers 10, 2 are provided.
0 is connected by a communication line L. Among them, the traction control controller 10 receives a wheel speed signal from a wheel speed sensor 12 attached to a wheel 11 to prevent wheel slip due to an excessive driving force of the vehicle. Traction control for detecting and obtaining the optimum wheel slip ratio (hereinafter referred to as ASR
Signal), that is, the fuel reduction signal, is constantly sent to the controller 20 for controlling the fuel injection amount via the communication line L.

On the other hand, the controller 20 for controlling the fuel injection amount, together with the fuel reduction signal from the communication line L,
The electronic governor 24 of the engine receives the accelerator opening signal from the accelerator opening sensor 22 that detects the accelerator opening of the accelerator pedal 21 and the engine speed signal from the engine speed sensor 23 that detects the engine speed. Generate a fuel injection amount control signal for controlling
The vehicle speed sensor 26 is also based on the auto cruise set signal when the auto cruise set switch 25 is set.
Electronic governor 2 with the current vehicle speed obtained from
The fuel injection amount control signal for No. 4 is given.

FIG. 4 conceptually shows the operation of the controller 20 shown in FIG.
A fuel reduction signal (hereinafter sometimes abbreviated as an ASR control signal) is received from the controller 10 via the communication line L to calculate an ASR accelerator opening degree for performing traction control.

Now, the process of the controller 20 receiving the ASR control signal to generate the ASR accelerator opening will be described with reference to FIG.

The ASR control signal sent from the controller 10 to the controller 20 has a frequency of, for example, 100 Hz.
The signal adopting the constant pulse width modulation method is sent via the line L. In the case of FIG. 7A, the pulse width is 9.2 ms in the signal period of 10 ms. The controller 20 recognizes that the ASR accelerator opening is 100% (fully open) and knows that the ASR is in the non-controlled state.

Further, in FIG. 2B, the pulse width is only 1 ms within the pulse period of 10 ms, and the controller 20 receiving this has the ASR accelerator opening of 0.
Recognize as% (fully closed).

Therefore, the controller 20 which receives the ASR control signal having a pulse width of 1 ms to 9.2 ms outputs 0 to 0.
It will be recognized as an intermediate ASR accelerator opening of 100%.

The ASR accelerator opening thus obtained is compared with the actual accelerator opening from the accelerator opening sensor 22 and the smaller accelerator opening is selected. this is,
This is because the ASR control signal is the fuel reduction signal, and therefore it is necessary to reduce the accelerator opening.

The required fuel injection amount can be calculated by considering the accelerator opening thus selected together with the engine speed from the engine speed sensor 23.

This is shown in FIG. 6, in which the horizontal axis represents the engine speed, the vertical axis represents the fuel injection amount, and a memory map having the accelerator opening as a parameter is provided in the controller 20. The fuel injection amount can be determined by selecting the actual accelerator opening and obtaining the engine speed at that time.

Since the cruise control injection amount is "0" when the auto-cruise set switch 25 is not set, the fuel injection amount thus obtained is the fuel injection amount as it is as the electronic governor control signal. It will be given to the governor 24.

Further, the automatic cruise set switch 25
When is set, the vehicle speed sensor 26
The automatic cruise control injection amount is determined by the vehicle speed (target vehicle speed) and the current vehicle speed.

Then, the automatic cruise control injection amount and the fuel injection amount are compared and the larger one is given to the electronic governor 23 as an electronic governor control signal, which is the automatic cruise control injection amount in the automatic cruise operation. This is because it is necessary to give priority to the engine as the electronic governor control signal.

[0015]

In the conventional example as described above, when the vehicle is in the auto-cruise control state, it is normal during the auto-cruise operation (that is, when the current vehicle speed = the target vehicle speed). Since the driver releases his / her foot from the accelerator pedal 21, the actual accelerator opening is fully closed.

In this state, the vehicle is in a slip state, and the controller 1 receives the wheel speed signal from the wheel speed sensor 12.
Even if 0 sends an ASR control signal, which is a fuel reduction signal, to the controller 20 through the communication line L, the controller 20 fully closes the actual accelerator opening to be compared with the ASR accelerator opening obtained from the ASR control signal. Therefore, the actual accelerator opening is always selected and the ASR
The control is invalid.

As a result, when the automatic cruise control is continued in the state where the ASR control is invalid, the slip of the wheel 11 causes the output signal of the vehicle speed sensor 26 attached to the drive shaft of the wheel. The controller 20, which has determined that the current vehicle speed has risen above the target vehicle speed, performs control in the direction of cutting the automatic cruise control injection amount, and as a result, the slip converges and the vehicle speed falls below the target vehicle speed. Therefore, the fuel is rapidly increased again. Since the automatic cruise control injection amount is controlled in the direction, there is a problem that the occurrence and the convergence of slip are repeated.

Therefore, according to the present invention, when the traction control controller outputs the traction control signal according to the wheel speed signal, the fuel injection amount control controller causes the smaller one of the traction accelerator opening and the actual accelerator opening according to the traction control signal. In the engine output control device that gives the engine an electronic governor control signal indicating the control fuel injection amount according to the engine speed and the engine speed, when the traction control and the auto cruise control are used together, the traction control should not be disabled. With the goal.

[0019]

In order to achieve the above object, in the engine output control device according to the present invention, the controller for controlling the fuel injection amount controls the fuel injection amount and the traction control by the auto cruise during the auto cruise. It is characterized in that the smaller one of the traction control fuel injection amounts by the signal is given to the engine as an electronic governor control signal.

Further, in the present invention, the controller for controlling the fuel injection amount can give an electronic governor control signal indicating the control fuel injection amount based on the actual accelerator opening degree to the engine when the accelerator pedal is depressed during the auto cruise. it can.

[0021]

The operation of the engine output control device according to the present invention will be described below with reference to the conceptual diagram shown in FIG. The same reference numerals as those shown in FIG. 1 denote the same parts as those shown in FIG.

First, when the automatic cruise control state is not set, the controller for fuel injection amount control which receives the ASR control signal from the controller for traction control is ASR.
Calculate the accelerator opening, compare it with the actual accelerator opening at this time, and use the smaller accelerator opening to determine the fuel injection amount in relation to the engine speed. It is given to the engine as a control signal.

When the automatic cruise control state is set in such a traction control state, the fuel injection amount control controller determines the automatic cruise control injection amount, and also obtains the ASR control injection amount from the ASR accelerator opening to determine the automatic cruise amount. The smaller of the control injection amount is determined.

The smaller one of the control injection amounts and the larger one of the fuel injection amounts are given to the engine as an electronic governor control signal.

By doing so, when a wheel slip occurs during the automatic cruise control, the ASR control injection amount is usually smaller than the automatic cruise control injection amount, so that the traction control becomes effective, and the slip and the convergence are suppressed. The repetition is eliminated, and the vehicle can travel stably. In particular, when the vehicle is turning, it is possible to reduce the disturbance of the vehicle posture due to the drastic reduction of the cornering force due to the idling of the drive wheels.

When the accelerator pedal is depressed during the automatic cruise operation (temporary acceleration), the fuel injection amount control controller gives the engine a control fuel injection amount based on the actual accelerator opening as an electronic governor control signal. Therefore, it is possible to achieve a vehicle speed higher than the vehicle speed set by the auto cruise control.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment for implementing the engine output control device according to the present invention, which is shown in principle in FIG. 1, a configuration as shown in FIG. 3 can be used as in the conventional example. Is omitted.

FIG. 2 is a flow chart showing an embodiment for realizing the control principle shown in FIG. 1, which is stored and executed in the fuel injection amount control controller 20 shown in FIG. The operation of the embodiment of the engine output control system of the present invention will be described below with reference to this flowchart and FIGS. 2 and 3.

FIG. 2 shows the control operation when the auto cruise set switch 25 shown in FIG. 3 is set. First, the controller 20 sets the auto cruise control injection amount (hereinafter, shown in the figure) corresponding to the set vehicle speed. Same as Q
Is calculated) (step S1). This is determined by a known calculation method based on the current vehicle speed and the target vehicle speed at the time of setting.

Then, in order to determine whether or not the accelerator pedal 21 is depressed during the automatic cruise control operation, it is determined whether or not the actual accelerator opening from the accelerator opening sensor 22 is "0" (at step S2). ).

As a result, when the accelerator opening is not "0", that is, when the accelerator pedal 21 is depressed, the flag F is set to "1" (step S3), and the actual accelerator opening and the ASR accelerator opening are set. And are compared (at step S4).

As a result, when the actual accelerator opening is greater than the ASR accelerator opening, the smaller ASR accelerator opening is selected (at step S5), and when not, the actual accelerator opening is selected (at step S6). At the same time, the accelerator opening thus selected is converted into the fuel injection amount Q1 (S
7). The conversion from the accelerator opening to the fuel injection amount can be obtained by using the memory map as shown in FIG. 6 in consideration of the engine speed at that time as described in the conventional example.

After executing step S7, the process proceeds to step S9.

Returning to step S2, when it is determined that the actual accelerator opening is "0", the accelerator pedal 21 is not depressed as in the normal auto cruise operation, so the ASR control signal from the controller 10 is sent. The ASR accelerator opening corresponding to the above is converted into ASR · Q in consideration of the engine speed at that time (at step S8).

Then, the ASR · Q obtained in this way
And the auto cruise Q determined from the relationship between the current vehicle speed and the target vehicle speed based on the auto cruise control (S9), and when ASR / Q is smaller, A
SR / Q is selected (at step S10), otherwise, auto-cruise Q is selected, and the selected injection amount Q is determined as the injection amount Q2 (at step S12).

Then, it is judged whether or not the flag F at this time is "1" (at step S13). When the flag F = 1,
Since the accelerator pedal 21 is being depressed, the flag F is first reset to "0" (S1
4) The control injection amounts Q2 and Q1 determined above are compared (at step S15).

As a result, when it is found that Q2> Q1, the larger control injection amount is selected, so the control injection amount Q2 is used as the electronic governor control signal (S1 in the same figure).
6) Otherwise, the output control of the engine is controlled by the electronic governor control signal based on the control injection amount Q1 (S1 of the same).
7).

That is, when the accelerator pedal is depressed and the vehicle is temporarily accelerated while the traction control and the auto cruise control are used together, the current vehicle speed is higher than the target vehicle speed, so the auto cruise Q is " Since it is set to "0", the state is effectively controlled by the actual accelerator opening.

When the accelerator pedal 21 is returned to the fully closed position and the target vehicle speed is approached, the auto cruise Q does not become "0", so that the ASR / Q is selected.

[0040]

As described above, according to the engine output control device of the present invention, the controller for controlling the fuel injection amount during the automatic cruise controls the amount of fuel injection and the traction control signal from the controller for controlling the traction. Since the smaller fuel control amount of the control fuel injection amount is given to the engine as the electronic governor signal, even if the traction control signal is required to reduce the fuel amount even during the automatic cruise control, It is possible to realize stable vehicle traveling without repeating the occurrence and convergence of slips by prioritizing the control of fuel reduction.

[Brief description of drawings]

FIG. 1 is a block diagram conceptually showing the operation of an engine output control device according to the present invention.

FIG. 2 is a flowchart showing a fuel injection amount control program stored and executed in a fuel injection amount control controller used in the engine output control device according to the present invention.

FIG. 3 is a diagram showing an embodiment of an engine output control device used in the present invention and a conventional example.

FIG. 4 is a block diagram for conceptually explaining the operation of a conventional example.

FIG. 5 is a waveform diagram for obtaining an accelerator opening degree for traction control from a traction control signal given from the traction control controller to the fuel injection amount control controller in the present invention and the conventional example.

FIG. 6 is a memory map diagram for obtaining the fuel injection amount from the actual accelerator opening and the engine speed in the present invention and the conventional example.

[Explanation of symbols]

 10 traction control controller 12 wheel speed sensor 20 fuel injection amount control controller 21 accelerator pedal 22 accelerator opening sensor 23 engine speed sensor 24 electronic governor 25 auto cruise set switch 26 vehicle speed sensor Indicates.

Claims (2)

[Claims] 1. When a traction control controller outputs a traction control signal in response to a wheel speed signal, the fuel injection amount control controller causes the engine rotation speed to be the smaller of the traction accelerator opening and the actual accelerator opening based on the traction control signal. In an engine output control device for providing an engine with an electronic governor control signal indicating a control fuel injection amount according to the number of fuel cells, the controller for controlling the fuel injection amount controls the fuel injection amount by the auto cruise and the traction control signal during auto cruise. The engine output control device is characterized in that the smaller control fuel injection amount of the traction control fuel injection amount by the engine is applied to the engine as an electronic governor control signal. 2. The fuel injection amount control controller provides an electronic governor control signal indicating a control fuel injection amount based on an actual accelerator opening degree to the engine when the accelerator pedal is depressed during auto cruise. Claim 1
The engine output control device according to.