JPH04101034A - Idle revolution number control device - Google Patents

Abstract

PURPOSE:To eliminate a bypass function for idling control, to simplify the structure and to reduce the cost by constituting so that an actual idle revolution number accords with a target idle revolution number even at idling using a function of a constant speed driving device. CONSTITUTION:A throttle actuator 7 for regulating an opening degree of a throttle valve 4 provided in an intake passage 3 is driven and controlled by a constant speed driving device 2 so that an actual car speed accords with a target car speed at the time of setting. In the above device, a throttle sensor 5 detects that the throttle valve 4 is almost full-open and puts out an idle signal. Also, an engine revolution number is detected by an engine revolution number sensor 8. Moreover, when the idle signal is detected, a throttle valve driving requesting signal is put out so that the engine revolution number accords with a target revolution number. And to the constant speed driving sensor 2, a fuel control device 1 is connected as an idle revolution number control means for driving the throttle actuator 7 according to the throttle valve driving requesting signal.

Description

[Detailed Description of the Invention] [Summary of the Invention] The present invention relates to an idle speed control device for a vehicle equipped with a constant speed running device, which opens and closes a throttle valve according to the difference between the engine speed and a target speed during idling. In addition to providing an instruction means for outputting a throttle drive request signal to
By providing the constant speed running device with an idle speed control means that drives the throttle actuator in accordance with the throttle drive request signal, the engine speed can be adjusted to the idle target speed using the function of the constant speed running device even during idling. It is designed to match. In addition, by providing the constant speed device with an idle speed control means that outputs a throttle actuator drive signal that opens and closes the throttle valve according to the difference between the engine speed and the target speed during idling, it is possible to adjust the engine speed to the idle target speed. It is designed to match.

[Industrial application field]

The present invention relates to an idle rotation speed control device for a vehicle equipped with a constant speed traveling device.

[Prior Art] An idle speed control device controls the amount of intake air so that the engine speed during idling, that is, the idle speed, matches the target speed.

FIG. 8 is a block diagram showing a conventional example of such an idle speed control device.

A throttle valve 74a is provided in the intake passage 73, and a bypass passage 79 is provided upstream and downstream of the throttle valve 74a. A bypass valve 74b for adjusting the idle rotation speed is provided in the bypass passage 79. When the throttle valve 74a becomes substantially fully closed, the throttle sensor 75 detects this and outputs an idle signal indicating the idling state.

The fuel control device 71 in the vehicle not only controls fuel supply, but also controls ignition timing and idle speed.
When this fuel control device 71 detects the idle signal, it starts feedback control of the idle rotation speed. That is, the engine speed signal detected by the engine speed sensor 78 is read, and the engine water temperature (not shown) is read.
It detects the load on the air conditioner and calculates the optimal idle speed, or target speed, under various conditions.

Then, the engine rotation speed and the target rotation speed are compared and calculated, and a drive signal is output according to the difference. The throttle actuator 77b then adjusts the opening degree of the bypass valve 74b based on the drive signal. Therefore, the amount of air passing through the bypass 79 is controlled according to the opening degree of the bypass valve 74b, and the idle rotation speed during idling is set. In this way, the engine rotation speed and the target rotation speed come to match.

On the other hand, in recent years, the number of vehicles equipped with a constant speed running device has increased, but this constant speed running device 72 is not related to the control of the fuel control device 71 (operates, and the running speed of the vehicle is set in advance when set). throttle valve 74a so that the speed
The throttle valve 74a controls the opening degree of the throttle valve 74a.
is connected to the wire 76 by the throttle actuator 77a.
operates through.

[Problem to be solved by the invention]

As mentioned above, in the conventional idle speed control device, in order to adjust the idle speed during idling, that is, when the throttle sensor is almost fully closed, a bypass passage is provided in the intake passage. The amount of air passing through was controlled by the opening degree of the bypass valve.

However, in order to control the idle speed in this way, it is necessary to provide a bypass passage, a throttle actuator, a bypass valve, etc. for idling, which makes the configuration complicated and has the problem of increasing costs. are doing.

Therefore, the purpose of the present invention is to remove the bypass function for controlling the idle speed and control the idle speed. An object of the present invention is to provide an idle speed control device that reduces the overall cost of an Il device.

[Means to solve the problem]

The present invention provides a vehicle equipped with a throttle actuator that adjusts the opening degree of a throttle valve provided in an intake passage, and a constant speed traveling device that drives the throttle actuator so that the actual vehicle speed matches the target vehicle speed when set. A device for controlling idle speed, comprising: idle state detection means for detecting that the throttle valve is almost fully closed and outputting an idle signal; and an engine speed sensor for detecting engine speed.
When the idle signal is detected, a throttle valve drive request signal is output that requests opening and closing of the throttle valve according to the difference between the engine speed and the target engine speed so that the engine speed matches the target engine speed. An idle rotation speed control '4B device, characterized in that the constant speed traveling device is further provided with an idle rotation speed control means for driving the slot actuator in accordance with the throttle valve drive request signal. and a vehicle equipped with a throttle actuator that adjusts the opening degree of a throttle valve provided in an intake passage, and a constant speed traveling device that drives the throttle actuator so that the actual vehicle speed matches the target vehicle speed when set. A device for controlling an idle speed, comprising an idle state detection means for detecting that the throttle valve is almost fully closed and outputting an idle signal, and an engine speed sensor for detecting the engine speed, Idle rotation speed control characterized in that the constant speed traveling device is further provided with an idle rotation speed control means for driving the throttle actuator so that the engine rotation speed matches the target rotation speed when the idle signal is detected. It is a device.

In the first aspect of the invention, when the throttle valve provided in the intake passage becomes substantially fully closed, the idle state detection means outputs an idle signal indicating that the indicating means is in the hair idling state. When the instruction means detects the idle signal, the instruction means provides a throttle valve drive request signal to the constant speed traveling device to request opening and closing of the throttle valve according to the difference between the target engine speed and the engine speed detected by the sensor. is sent to the idle rotation speed control means. The idle rotation speed control means sends out a throttle actuator drive signal that drives the throttle actuator based on the throttle valve drive request signal. Therefore, the throttle actuator is driven in accordance with the throttle actuator drive signal, the throttle valve is opened and closed, and the amount of air passing through the intake passage is controlled. In this way, the idle rotation speed is controlled to match the target rotation speed. According to the second invention, when the constant speed traveling device detects an idle signal, the idle speed control means provided in the constant speed traveling device compares the engine speed and the target speed and throttles the engine so that the two match. Drive the actuator.

[Embodiments of the invention]

FIG. 1 is a block diagram showing an embodiment of the present invention.

The fuel control device 1 calculates the amount of fuel required for the engine from signals from each sensor (not shown) that detects the state of the engine.
The fuel injection control unit controls the amount of fuel injected to achieve the optimal air-fuel ratio, the engine rotation speed, and signals from each sensor to comprehensively judge the engine condition and determine the optimal ignition timing. The engine includes an ignition timing control section that sends an ignition signal to the igniter, and an idle rotation speed control section that controls the idle rotation speed to an appropriate rotation speed during idling. however,
In this embodiment, when an idle signal indicating an idling state is detected from the throttle sensor 5, the constant speed traveling device 2 is activated according to the difference between the engine speed detected by the engine speed sensor 8 and the target engine speed. On the other hand, the instruction means for outputting the throttle valve drive request signal operates as an idle rotation speed control section. In this case, the target engine speed is calculated by the fuel control device 1, and is the optimum idle speed according to the state of the engine based on input signals from each sensor.

The throttle valve 4 is provided in the intake passage 3,
An amount of intake air corresponding to the opening degree of the throttle valve 4 is supplied to an engine (not shown).

The throttle sensor 5 is provided on the shaft that rotates the throttle valve 4, and the throttle sensor 5 is installed on the shaft that rotates the throttle valve 4, and when the opening degree of the throttle valve 4 is approximately 1
When the temperature falls below 0°, it is detected as an idling state, that is, a substantially fully closed state, and an idling signal indicating the idling state is sent to the fuel control device 1 and the constant speed traveling device 2.

The throttle actuator 7 pulls or pulls back the wire 6 based on the throttle actuator drive signal sent from the constant speed traveling device 2, while
Adjust the opening degree of the throttle valve 4.

When a set switch (not shown) is operated, the constant speed traveling device 2 enters the set mode, stores the vehicle speed at that time as the set vehicle speed, and thereafter throttles the vehicle so that the traveling speed of the vehicle matches the set vehicle speed in this set mode. Known constant speed running control means for controlling the opening degree of the valve 4 and throttle sensor 5
When the idle signal sent from the indicating means is detected, the throttle actuator 7 is driven in accordance with the throttle valve drive request signal sent from the indicating means, and the opening degree of the throttle valve 4 is controlled via the wire 6. and control means.

FIG. 2 is a time chart of the idle speed control device in this embodiment, and the operation of this embodiment will be explained below using this time chart. Fig. 2 (1) shows the temporal change in throttle opening, Fig. 2 (2) shows the state of the idle signal, Fig. 2 (3) shows the state of the engine speed, and Fig. 2 (4) shows the state of the engine speed.
) is the state of the throttle valve drive request signal, Fig. 2 (5
) represent the temporal change in the throttle actuator operating amount.

For example, if you take your foot off the accelerator pedal during non-controlled driving at a constant speed, the throttle valve 4 will open as shown in Fig. 2 (1).
progresses from the open state to the closed state, and at time t1, when the opening degree becomes less than about 10 degrees, which corresponds to the almost fully closed state, the output of the throttle sensor 5 becomes H as shown in FIG. 2 (2). ” to “L” indicating an idle state.

The fuel control device 1 receives this idle signal and starts idle rotation speed control.

As the throttle opening decreases, the engine speed increases as shown in Figure 2 (
As shown in 3), the rotation speed decreases, but at time t1, the target rotation speed! ! Since the engine speed is higher than 1, the fuel control device 1 outputs "L" as a throttle valve drive request signal to close the throttle valve 4. In response to this, the constant speed traveling device 2 sends a closing drive signal to the throttle actuator Unitough, but since the throttle actuator 7 is not operating before t1 and is not performing an opening operation,
Its operating amount maintains a fully closed state. and time t2
When the engine speed becomes equal to or lower than the target rotation speed 11, the fuel control device 1 outputs a throttle valve drive request signal "H" to the throttle actuator unitar, which instructs the throttle valve to be driven in the opening direction. In response to this request signal, the constant speed traveling device 2 sends a drive signal to the throttle actuator to drive it in the opening direction, thereby causing the throttle actuator 7 to move as shown in FIGS. 2(1) and (5). As the throttle valve 4 is driven in the opening direction, the throttle valve 4 opens, and the second
As shown in Figure (3), the actual engine speed will gradually increase. When the actual engine speed becomes higher than the target speed 11 at time t3, the fuel control device 1 sends "L" as a throttle valve drive request signal to close the throttle valve 4, as shown in FIG. Upon receiving this request signal, the constant speed traveling device 2 sends a drive signal to drive the throttle actuator in the closing direction, thereby causing the throttle actuator to move as shown in FIGS. 2(1) and (5). 7 is driven in the closing direction, the opening degree of the throttle valve 4 decreases, and the actual engine speed accordingly decreases as shown in FIG. 2 (3).

The above operations are repeated, and the engine speed is controlled to match the target speed.

When the accelerator pedal is depressed in such an idling state, the throttle opening and engine speed increase as shown in FIG. If it exceeds Figure 2 (
2) At the mountain pass, the idle signal changes to "H" indicating that the vehicle is not in the idle state, and the idle rotation speed control ends.

Since the throttle valve 4 is connected to the accelerator pedal via another wire (not shown), the throttle valve 4 is driven by that wire after time t4, and the vehicle runs as the actual vehicle speed is controlled by the normal accelerator pedal. become.

FIGS. 3 and 4 show flowcharts of the operations of the fuel control device 1 and constant speed traveling device 2 for carrying out the above operations.

In the fuel control device 1, a subroutine for outputting a throttle valve drive request signal shown in FIG. 3 is entered from the main routine in the microcomputer. First, in step S2, it is determined whether the idle signal output from the throttle sensor 5 is "L", that is, whether the engine is in an idle state.

If it is "L", that is, in the idle state, the process moves to the idle control after step S3. If "H", that is, the non-idling state, the process advances to step S6, and returns to the main routine, where fuel injection control, ignition control, etc. are performed.

In step S3, the target rotational speed NT and the actual rotational speed N are compared, and if the engine rotational speed N is larger than the target rotational speed NT calculated by the fuel control device 1, the process moves to step S8, and the throttle actuator 7 The output VT is set to "L" as a request signal to close the gate. If the actual rotational speed N is not larger than the target rotational speed NT, the process proceeds to the next step S4, and in step S5, if N>NT, that is, the actual rotational speed N determined by the engine rotational speed sensor 8 is the target rotational speed calculated by the fuel control device ff. If it is smaller than the number NT, the process proceeds to the next step S7, where the output VT is set to “H” as a request signal to open the throttle actuator 7.
”.

Moreover, in step S4, if No, that is,
When the actual rotation speed N matches the target rotation speed NT, the process proceeds to the next step S5, and a signal is output to invert the state of the throttle actuator 7 before the actual rotation speed N and the target rotation speed NT matched.

This speeds up the convergence to the target rotational speed.

FIG. 4 is a flowchart for explaining the constant speed traveling device in this embodiment, and FIG. 4(a) is a main routine of the microcomputer in the constant speed traveling device. First, in step R1, it is determined whether or not auto drive is being set.

That is, it is determined whether or not a set switch (not shown) has been operated to enter the set mode. If auto drive is being set, normal auto drive is performed in step R2, and the actual vehicle speed is controlled to match the target vehicle speed. If the auto drive is not being set, a subroutine for controlling the idle rotation speed is entered in step R3. FIG. 4(b) shows this idle rotation speed control subroutine. In step R4, the throttle sensor 5
It is determined whether the idle signal from the engine is "L", that is, the idling state, and if it is the idling state, the process proceeds to the next step R5 to execute idling control. If the idling signal is "H", that is, in a non-idling state, the process advances to step R8 and returns to the main routine. In step R5, a throttle valve drive request signal from the fuel control device 1 is detected, and if the signal is "H", that is, a signal requesting driving of the throttle valve 4 in the opening direction, the process proceeds to step R6, where the current required throttle opening N By adding a constant opening degree ΔV7H to V t H and outputting the result, the throttle actuator is driven in the opening direction and the process returns to the main state. If the signal is "L", that is, a signal requesting driving of the throttle valve 4 in the closing direction, the process proceeds to step R7, where the constant opening ΔV'T'H is subtracted from the current required throttle opening NVTH. The output drives the throttle actuator in the closing direction and returns to the main state. Since the throttle opening degree is adjusted in this way to make the actual idle rotation speed match the idle target rotation speed, it is possible to eliminate the bypass function for idling control. Therefore, the configuration can be simplified and costs can be reduced.

In this embodiment, since it is necessary to perform fine idle control within a throttle opening range of 10 degrees, the throttle opening change amount ΔV TH % Δy 1 ton is set to be very small during idle control. In addition, by setting the constant opening ΔV' 7N in step R7 to be even smaller than the constant opening Δ■A in step R6, responsiveness during throttle opening direction control is improved and engine stall is prevented during throttle closing direction control. That's what I do.

FIG. 5 is a configuration diagram showing a second embodiment of the present invention,
The constant speed traveling device 52 performs all idle rotation speed control. In the figure, parts equivalent to those in FIG. 1 are given the same reference numerals.

The constant speed traveling device 52 includes the above-described constant speed traveling control means and idle speed control means, and in this embodiment, when the idle speed control means detects the idle signal sent from the throttle sensor 5, Engine speed sensor 8
A throttle actuator drive signal corresponding to the difference between the detected engine speed and the target engine speed is output, the throttle actuator 7 is driven, and the opening degree of the throttle valve 4 is controlled via the wire 6.

FIG. 6 shows a flowchart of the constant speed traveling device 52 for performing the above operations. FIG. 6(a) shows the main routine of the microcomputer in the constant speed cruise control system.

First, in step P1, it is determined whether auto drive is in progress, and if auto drive is being set, step P1 is performed.
In step 2, normal auto-drive is performed and the actual vehicle speed is controlled. If the auto drive is not set, a subroutine for controlling the idle rotation speed is entered in step P3.

FIG. 6(b) is a subroutine for controlling the idle rotation speed of the microcomputer in the constant speed traveling device 52.

In step P4, if the idle signal is set to "L" by the throttle sensor 5, that is, the engine is in an idling state, the process moves to idle control from step P5 onwards. The idle signal is “
H″, that is, if it is in a non-idling state, step P
Proceed to step 9 and return to the main routine. In step P5, the target rotational speed NT and the actual rotational speed N are compared, and if the engine rotational speed N is larger than the target rotational speed NT calculated by the constant speed traveling device 52, step P8 is entered, and the throttle actuator 7 is It is driven in the closing direction based on the throttle actuator drive signal sent from the constant speed traveling device 52. Then, the throttle valve 4 is driven in the closing direction via the wire 6, and the process advances to the next step P9 to return to the main routine. Also, the actual rotation speed N
is larger than the target rotation speed NT, the next step P6
will proceed to. In step P6, the target rotation speed N
T and the actual engine speed N are compared, and if the actual engine speed N is smaller than the target engine speed NT, the process goes to step P7, and the throttle actuator 7 is activated by the throttle actuator 7 sent out from the constant speed traveling device 52. - Operates in the opening direction based on the motor drive signal. Then, the throttle valve 4 is driven in the opening direction via the wire 6, and the process advances to the next step P9 to return to the main routine.

Note that the constant speed traveling device 52 may be provided with an instruction means similar to that of the first embodiment for outputting a throttle valve drive request signal.

FIG. 7 is a flowchart for explaining a constant speed traveling device showing a third embodiment of the present invention.

That is, as shown in FIG. 7, step R of FIG.
It is also possible to control the idle rotation speed by incorporating step 83 to step S8 in FIG. 3 between step 4 and step R5.

〔Effect of the invention〕

As described above in detail, according to the present invention, even during idling, the function of the constant speed traveling device is used to match the actual idling speed to the idling target speed. Functions can be removed. Therefore, the configuration can be simplified and costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a time chart diagram of an idle speed control device in this embodiment, and Fig. 3 is for explaining a fuel injection control device in this embodiment. FIG. 4 is a flowchart for explaining the constant speed cruise control device in this embodiment, FIG. 5 is a configuration diagram showing the second embodiment of the present invention, and FIG. FIG. 7 is a flowchart for explaining a constant speed traveling device according to the third embodiment of the present invention, and FIG. 8 is a conventional example. FIG. In the figure, 1: fuel control device, 2: constant speed running device, 3:
Intake passage, 4: Throat torque valve, 5: Throat/7 torque sensor, 6: Wire, 7: Throat torque actuator, 8
: Engine speed sensor, 71: Fuel control device, 72:
Constant speed traveling device, 73: Intake passage, 74a: Throttle valve, 74b = Bypass valve, 78: Engine speed sensor, 79: Bypass passage.

Claims (2)

[Claims] (1) Idle vehicle equipped with a throttle actuator that adjusts the opening of a throttle valve provided in the intake passage, and a constant speed traveling device that drives the throttle actuator so that the actual vehicle speed matches the target vehicle speed when set. A device for controlling engine speed, comprising an idle state detection means for detecting that the throttle valve is almost fully closed and outputting an idle signal, an engine rotation sensor for detecting the engine speed, and an engine rotation sensor for detecting the idle signal. and an instruction means for outputting a throttle valve drive request signal requesting opening/closing of the throttle valve according to the difference between the engine speed and the target engine speed so that the engine speed matches the target engine speed when the engine speed is detected. An idle rotation speed control device further comprising: an idle rotation speed control means for driving the throttle actuator in response to the throttle valve drive request signal in the constant speed traveling device. (2) Idle vehicle equipped with a throttle actuator that adjusts the opening of a throttle valve provided in the intake passage, and a constant speed traveling device that drives the throttle actuator so that the actual vehicle speed matches the target vehicle speed when set. The apparatus for controlling the rotational speed is provided with idle state detection means for detecting that the throttle valve is almost fully closed and outputting an idle signal, and an engine rotational speed sensor for detecting the engine rotational speed, and further comprising: An idle rotation speed control device, characterized in that said constant speed traveling device is provided with an idle rotation speed control means for driving said throttle actuator so that said engine rotation speed matches a target rotation speed when said idle signal is detected.