JPH0867174A - Control device of engine - Google Patents

Abstract

PURPOSE: To make an engine brake usable, and to prevent a deterioration of the brake function, by connecting a clutch making in an economy run condition, when it is decided that the throttle is in the full opening condition. CONSTITUTION: A gear change ratio regulating means 38 is operated electrically by a control means 24 in order to carry out an adequate gear change control of a continuously variable transmission 14, when a starting clutch 22 is made in a cutoff condition in the running of a vehicle. This control means 24 inputs various signals, and when it is decided that the engine is in a throttle full opening condition by the engine operating condition and the vehicle running condition, it controls in order to make into an economy run condition to stop the fuel feeding as in the condition the starting clutch 22 is connected preferentially. That is, the operating condition is converted from an economy run operating condition in the throttle full closing time, to an economy run operating condition of opening the clutch, instantly, and the engine brake is made possible to operate by connecting the starting clutch. Consequently, a deterioration of the brake function can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device, and more particularly, to an eco-run in which a starting clutch is preferentially connected when it is determined that the throttle is fully closed when the eco-run is performed to release the clutch. The present invention relates to a control device for an engine in an operating state.

[0002]

2. Description of the Related Art In a vehicle, a transmission is provided in a power transmission system between an engine and wheels because the characteristics of the engine are not suitable as they are.

Some engines are equipped with an automatic stop / start control device for automatically stopping / starting the engine under predetermined conditions in order to reduce fuel consumption.

As this automatic stop / start control device, for example, JP-A-4-246252 and JP-A-4-358 are available.
No. 729 and Japanese Patent Application Laid-Open No. 5-1592. What is described in Japanese Patent Laid-Open No. 4-246252 is
When the accelerator pedal is depressed while the engine is stopped, the starter is operated and the engine is automatically restart-controlled when a predetermined starting condition is satisfied. Japanese Patent Application Laid-Open No. 4-358729 discloses a case where a condition in which a predetermined time has elapsed since the engine was stopped while the engine was stopped, a condition in which the transmission is in a neutral state, and a condition in which the vehicle is in a stopped state are satisfied. This is to automatically restart the engine. Japanese Patent Application Laid-Open No. 5-1592 discloses that the vehicle is in a stopped state while the engine is operating, the clutch pedal is in a depressing operation state less than a predetermined value, and the electric device is in a non-energized state. When the stop condition is satisfied, the engine is controlled to stop, and after the stop condition is satisfied, the engine is started when the start condition that the clutch pedal is depressed more than a predetermined value is satisfied. If the prohibition condition that the vehicle does not continue at the set vehicle speed or higher for a predetermined time or longer is satisfied after the engine is started by the satisfaction of the start condition, the engine stop is prohibited by the satisfaction of the stop condition. is there.

Some engines mounted on vehicles have a continuously variable transmission (CVT) as a transmission equipped with a starting clutch. This continuously variable transmission changes the radius of gyration of a belt wound around a drive pulley and a driven pulley to continuously control a gear ratio.

In order to reduce fuel consumption in an engine to which the continuously variable transmission is connected, for example, the engine is stopped when the vehicle is stopped, or the starting clutch is disengaged while the vehicle is running. Engine is stopped.

Further, as an apparatus for reducing fuel consumption in an engine in which a continuously variable transmission is connected as described above,
For example, it is disclosed in Japanese Patent Laid-Open No. 4-2788841. In the one disclosed in JP-A-4-278841, a flywheel having a clutch in the front and rear is provided between the engine and the continuously variable transmission, and the engine is stopped when the vehicle is stopped or running. The transmission path is disengaged by the clutches at the front and rear of the flywheel, and the accessories are driven by the inertia of the flywheel.

[0008]

By the way, in the conventional engine control device, when the predetermined condition is satisfied, the starting clutch is released, and the air flow rate is reduced regardless of the depression state of the accelerator pedal to perform the eco-run. Some adopt driving.

[0009] For reference, the patent applicant has already completed the application of an eco-run operation system of an engine stop method which is an idle operation method or another method.

There are the following five methods for determining the state for performing the eco-run operation. , When the throttle is fully closed, the starting clutch is connected and fuel stop control is performed. When the throttle is fully closed, the starting clutch is released at a low vehicle speed to prepare for the vehicle stop. When the throttle is low, the eco-run operation is performed at the generated torque of 0 m according to the throttle opening relative to the vehicle speed. During the deceleration driving, the throttle opening relative to the vehicle speed is determined from the deceleration of the vehicle to determine the driver's intention to decelerate, and the eco-run operation is performed. During constant-speed running, the throttle opening relative to the vehicle speed is determined from the deceleration of the vehicle to determine the driver's intention to decelerate and perform eco-run operation.

The priority of each of the above conditions has not been clarified, and a state transition diagram of the conventional eco-run operation is disclosed in FIG. 9 for reference.

However, in the above determination method, since the vehicle speed is limited to the state in which the vehicle speed shifts only at an extremely low speed,
It is unlikely to transit to the above states.

As a result, in the conventional engine control device, the control for releasing the starting clutch may be performed as an idle operation even when the throttle is fully closed, the engine brake cannot be used, and the braking performance deteriorates. However, it is disadvantageous in practical use.

In addition, in the above-mentioned determination methods, when the throttle fully closed state is detected during the eco-run operation in which the starting clutch is released, as shown in FIG. Since the eco-run operation in which the start clutch is closed is performed, there is a disadvantage that the eco-run operation is reduced by the amount of passing the normal travel.

[0015]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention releases the starting clutch when a predetermined condition is satisfied and reduces the air flow rate regardless of the depression state of the accelerator pedal to perform the idle operation. In the engine control device having the eco-run operation method, the engine required load amount detecting means for detecting the engine required load amount is provided, and the detection signal from the engine required load amount detecting means is input to indicate that the throttle is fully closed. When the determination is made, a control means is provided for performing control so that the fuel supply is stopped and the eco-run operation state is preferentially maintained with the starting clutch being engaged.

[0016]

According to the structure of the present invention, when it is judged that the throttle is fully closed, the control means gives the eco-run operation state in which the fuel supply is stopped while the starting clutch is preferentially connected. The engine clutch can be used by connecting the starting clutch.

[0017]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings.

1 to 8 show an embodiment of the present invention. 5 and 6, 2 is an engine mounted on the vehicle, and 4 is a control device for the engine 2.

Air is supplied to the engine 2 from an air cleaner 6 through an intake passage 8. A throttle valve 10 is arranged in the intake passage 8. The throttle valve 10 opens and closes in conjunction with the operation of the accelerator pedal 12.

A continuously variable transmission (CVT) 14 (not shown), which is a transmission, includes a drive pulley (primary pulley) 1
6, a driven pulley (secondary pulley) 18, and a belt 20 wound around the drive pulley 16 and the driven pulley 18.

The drive pulley 16 has a drive shaft whose one end is connected to a long travel damper, a drive-side fixed pulley portion integrally provided at a central portion of the drive shaft, and an axial movement on the drive shaft. And a drive-side movable pulley portion provided so as to be non-rotatable. Further, on the back side of the drive side movable pulley section piece, a drive side housing which cooperates with the back side of the drive side movable pulley section piece to form a drive side hydraulic chamber is provided on the drive shaft. A drive shaft rotation detection gear is fixedly provided on the other end side of the drive shaft.

The driven pulley 18 includes a driven shaft arranged in parallel with the driving shaft and a driven side fixed pulley part which is arranged corresponding to the driving side movable pulley part and is provided integrally with the driven shaft. And a driven side movable pulley section piece which is arranged corresponding to the drive side fixed pulley section piece and is axially movable and non-rotatably provided on the driven shaft. Further, on the rear surface side of the driven side movable pulley portion piece, a driven side housing that cooperates with the back surface of the driven side movable pulley portion piece to form a driven side hydraulic chamber is provided on the driven shaft. A driven shaft rotation detection gear is fixed to one end of the driven shaft.

A hydraulic start clutch 22 is provided on the other end side of the driven shaft. This starting clutch 22
Is provided at a stage subsequent to the speed change portion of the continuously variable transmission, is operated by hydraulic pressure acting on the clutch pressure chamber, and interrupts power to the output shaft rotatably supported by the driven shaft.
A cluster gear, which is an output shaft rotation detection gear, is fixed to the output shaft.

Further, the continuously variable transmission is provided with a hydraulic control mechanism. This hydraulic control mechanism is provided with a line solenoid, a clutch solenoid, and a ratio solenoid.

The hydraulic control mechanism flows in the oil pumped from the oil pump through the oil introduction passage, applies the line pressure to the driven side hydraulic chamber through the line pressure passage, and also through the clutch pressure passage. The clutch pressure is applied to the clutch hydraulic chamber, and further the ratio pressure is applied to the drive side hydraulic chamber via the ratio pressure passage. The oil pump is driven as the engine 2 is driven.

The line solenoid, the clutch solenoid, and the ratio solenoid are connected to the control means 24, and the duty is controlled by the duty value (Ur) (0 to 100%).

Further, the control means 24 includes an engine required load amount detection means 26 for detecting the opening state of the throttle valve 10 (throttle opening degree) or the intake pipe negative pressure state.
An idle switch 28 for detecting an idle operation state,
A drive shaft rotation speed sensor 30 which is provided in the vicinity of the drive shaft rotation detection gear and detects the rotation of the drive shaft as an engine rotation speed (Ne); and a transmission portion input rotation speed sensor 32 which detects a transmission portion input rotation speed, An output shaft rotation speed sensor 34 provided near the cluster gear to detect the rotation of the output shaft, that is, the rotation speed of the clutch output side as the vehicle speed (Nv).
And other detection means such as an eco-run switch for detecting an eco-run operation state, a shift position sensor for detecting a shift lever position (not shown), and a power (POW) switch.

The control means 24 inputs various signals and controls the operation of the air flow rate realizing means 36 during idle operation, the starting clutch 22 and the gear ratio adjusting means 38, as shown in FIG.

Further, the air flow rate realizing means 36 includes, for example, an air cleaner 6 and a throttle valve 1 as shown in FIG.
It has a fully closed valve 40 provided in the intake passage 8 between 0 and a fully closed valve solenoid 42 for operating the fully closed valve 40. The operation of the solenoid 42 for fully closing the valve is controlled by the control means 24. The fully-closed valve 40 and the fully-closed solenoid 42 are diverted parts of the switching system of the intake passage 8.

As shown in FIG. 6, when the intake passage 8 is fully closed by the closing operation of the fully closed valve 40, a predetermined amount of air is supplied to the engine 2 so that the engine 2 is in an idle operation state. Therefore, an idle operation intake passage 44 that bypasses the fully closed valve 40 and the throttle valve 10 is provided.

The air flow rate realizing means 36 shown in FIG.
As shown in FIG. 7, when the engine 2 is in a normal operating state, the fully-closed valve solenoid 42 is turned off to open the fully-closed valve 40, and the air flow rate is adjusted by the throttle opening. When the engine 2 is in the idle operation state, the fully-closed valve solenoid 42 is turned on to close the fully-closed valve 40, so that the intake passage 8 is fully closed, thereby reducing the air flow rate for idle operation. Adjust in the intake passage 44.

The gear ratio adjusting means 38 controls the gear shift ratio of the continuously variable transmission when the starting clutch 22 is disengaged while the vehicle is traveling.
It is electrically operated by.

The control means 24 inputs various signals,
Driving operation state of the engine 2 (for example, throttle opening,
Idle switch ON / OFF operation, etc.) and engine 2
When it is determined that the throttle is fully closed based on the driving state of the vehicle (for example, the engine rotation speed, the input rotation speed of the transmission portion, etc.) and the running state of the vehicle (vehicle speed, etc.), the starting clutch 22 is preferentially connected. The fuel cell system is configured to perform control to bring the fuel supply to an eco-run operation state in which the fuel supply is stopped.

More specifically, as shown in FIG. 1, when the throttle opening is reduced to the fully closed state in the clutch release eco-run operation state, priority is given to the eco-run operation state when the throttle is fully closed. By making a transition, the starting clutch 22 is changed from the disengaged state to the connected state, and the clutch is connected to the eco-run operation state when the throttle is fully closed.

When the starting clutch 22 is preferentially engaged to bring the clutch into the eco-run operation state in which the clutch is engaged when the throttle is fully closed, the fuel supply is stopped.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG. 2 and the time chart of FIG.

When the program of the control means 24 is started (102), it is first judged (104) whether or not the eco-run prohibition condition is satisfied.

In this judgment (104), if the eco-run prohibition condition is satisfied, the fully closed valve 40 is closed to bring the intake passage 8 into a fully closed state (106), and the normal variable transmission normally operates. The starting clutch control (108) is performed.

When the eco-run prohibition condition is not satisfied in the judgment (104), that is, when the eco-run prohibition condition is not satisfied, it is judged (110) whether or not the throttle full-closed judgment condition is satisfied. If the closing determination condition is satisfied, the fully closed valve 40 is closed (112), and
The starting clutch 22 of the continuously variable transmission is brought into the connected state (114).

On the other hand, if it is judged in the judgment (110) that the throttle fully closed judgment condition is not satisfied, it is judged (116) whether or not the eco-run judgment condition other than the throttle fully closed condition is satisfied.

If the eco-run judgment condition other than the throttle fully closed condition is satisfied in this judgment (116), the fully closed valve 40 is closed (118), and the starting clutch 22 of the continuously variable transmission is released ( 120).

If the eco-run judgment conditions other than the throttle fully closed condition are not satisfied in the judgment (116), the fully closed valve 40 is opened, that is, the intake passage 8 is fully opened (122),
Then, the normal starting clutch control (124) is performed.

The above processing (108, 114, 120, 12)
After the processing of 4), this program is ended (126).

As described above, the eco-run operation when the throttle is fully closed is given the highest priority, and when the driver releases the throttle pedal with the intention of decelerating, it can be judged that the throttle is fully closed. The eco-run operation state in which the clutch is released is immediately changed to the eco-run operation state in which the throttle is fully closed, and the engine clutch can be used by connecting the starting clutch 22.

The eco-run prohibition condition in the judgment (104) will be described in detail. As shown in FIG. 3, when the program of the control means 24 is started (202), whether or not the eco-run switch for detecting the eco-run operation is ON. If the eco-run switch is ON in this judgment (204), the eco-run prohibition condition is satisfied (206), and then the end (214) is executed, and the eco-run is judged in the judgment (204). If the switch is OFF, the process proceeds to a determination (208) as to whether the shift position position is the drive position.

When the determination (208) is NO, the eco-run prohibition condition is satisfied (206). When the determination (208) is YES, the power switch is turned off.
The process proceeds to the determination (210) as to whether N.

If this judgment (210) is YES,
If the eco-run prohibition condition is satisfied (206) and the judgment (210) is YES, the eco-run prohibition condition is not satisfied (212), and then the end (214) is executed.

Further, the throttle full closing determination condition in the determination (110) will be described in detail. As shown in FIG. 4, the program of the control means 24 starts (30).
2) Then, it is judged whether the throttle is fully closed, that is, whether the idle switch 28 is ON (304).

If this judgment (304) is YES,
When the determination (304) is NO, the throttle fully closed condition is satisfied (308), and when the determination (304) is NO, the throttle fully closed condition is not satisfied (308), and then both are moved to the end (310).

As a result, when the eco-run prohibition condition is not satisfied and the throttle fully closed determination condition is satisfied, the condition shown in FIG.
At the point a, the eco-run operation in which the clutch is released is preferentially changed to the eco-run operation in which the throttle is fully closed and the clutch is connected, and the starting clutch 22 is connected to transmit the absorption torque of the engine to the vehicle. The brake can be activated and the braking effect can be enhanced.

When the throttle is not fully closed,
By being able to perform the conventional eco-run operation, fuel consumption can be reduced and it is economically advantageous.

Further, since there is little deterioration of drivability due to the eco-run operation when the throttle is fully closed, there is no fear of adversely affecting the driving performance, which is practically advantageous.

Furthermore, the engine required load amount detecting means 26 for detecting the opening degree of the throttle valve 10 (throttle opening degree) state or the intake pipe negative pressure state is provided. And the intake pipe negative pressure can be detected reliably, which can contribute to the reliability of control.

Further, in the embodiment of the present invention, the transmission is described as a continuously variable transmission (CVT) and simply as a starting clutch, but it can be applied to any transmission equipped with an electronically controlled starting clutch. The versatility can be improved.

[0055]

As is clear from the above detailed description, according to the present invention, the engine required load amount detecting means for detecting the engine required load amount is provided, and the detection signal from the engine required load amount detecting means is input to the throttle. When it is determined that the throttle is in the fully closed state, the throttle is fully closed because the control means is provided to control the fuel supply to be stopped and the eco-run operation state is preferentially maintained with the starting clutch still connected. At this time, the eco-run operation with the clutch released is preferentially changed to the eco-run operation with the clutch fully closed to connect the clutch, and the starting clutch is connected to transmit the absorption torque of the engine to the vehicle to activate the engine brake and improve the braking effect. Can be increased. In addition, when the throttle is not fully closed, the conventional eco-run operation can be performed, which can reduce fuel consumption and is economically advantageous. Further, since there is little deterioration of drivability due to the eco-run operation when the throttle is fully closed, there is no fear of adversely affecting the driving performance, which is practically advantageous. Furthermore, by providing the engine required load amount detecting means, the required load amount of the engine can be reliably detected, which can contribute to the reliability of control. In addition, it can be applied to any transmission equipped with an electronically controlled start clutch,
Versatility can be improved.

[Brief description of drawings]

FIG. 1 is a time chart of an engine control device showing an embodiment of the present invention.

FIG. 2 is a flowchart of an engine control device.

FIG. 3 is a flowchart of eco-run prohibition conditions.

FIG. 4 is a flowchart of a throttle fully closed determination condition.

FIG. 5 is a block diagram of an engine control device.

FIG. 6 is a system configuration diagram of an air flow rate realizing means during idle operation.

FIG. 7 is a diagram for explaining the operation of the air flow rate realizing means during idle operation in FIG.

FIG. 8 is a state transition diagram of eco-run operation.

FIG. 9 is a state transition diagram of eco-run operation showing a conventional technique of the present invention.

[Explanation of symbols]

 2 engine 4 control device 6 air cleaner 8 intake passage 10 throttle valve 12 accelerator pedal 14 continuously variable transmission (CVT) 16 drive pulley (primary pulley) 18 driven pulley (secondary pulley) 20 belt 22 starting clutch 24 control means 26 engine required load Quantity detection means 28 Idle switch 30 Drive shaft rotation speed sensor 32 Transmission section input rotation speed sensor 34 Output shaft rotation speed sensor 36 Air flow rate realizing means 38 Gear ratio adjusting means 40 Fully closed valve 42 Fully closed valve solenoid 44 Idle for idle operation aisle

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[Procedure amendment]

[Submission date] November 8, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device, and particularly to an eco-run operation in which a starting clutch is preferentially connected when it is determined that the throttle is fully closed during eco-run operation for releasing the clutch. The present invention relates to a control device for an engine in a state.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

There are the following five methods for determining the state for performing the eco-run operation. , When the throttle is fully closed, the starting clutch is connected and fuel stop control is performed. When the throttle is fully closed, the starting clutch is released at a low vehicle speed to prepare for the vehicle stop. When the throttle is low, the throttle opening corresponding to the vehicle speed is made to correspond, and the eco-run operation is performed when the generated torque is approximately 0 m. During the deceleration driving, the throttle opening relative to the vehicle speed is determined from the deceleration of the vehicle to determine the driver's intention to decelerate and the eco-run operation is performed. During constant speed running, the throttle opening relative to the vehicle speed is judged from the deceleration of the vehicle to determine the driver's willingness to run at constant speed, and eco-run operation is performed.

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[Claims] 1. A control device for an engine having an eco-run operation system, in which a starting clutch is released when a predetermined condition is satisfied and an air flow rate is reduced to perform an idle operation regardless of a depressed state of an accelerator pedal, an engine required load amount is detected. The engine required load amount detecting means is provided, and when the detection signal from the engine required load amount detecting means is input and it is determined that the throttle is fully closed, the starting clutch is preferentially kept in the connected state. An engine control device comprising a control means for controlling an eco-run operation state in which fuel supply is stopped.