JPH0885368A - Engine control device - Google Patents

Abstract

PURPOSE: To increase the time of the economy running and to improve the fuel consumption and the operational performance by stopping the engine and releasing a starting clutch according to the generated torque based on the required load of the engine by an engine stop/start control device. CONSTITUTION: The signals from sensors 62, 64, 66, 68 for the throttle opening, the engine speed, the input number of revolution of a transmission, and the vehicle speed are received by a control means 46, and the engine 2 is stopped and a starting clutch 42 is released when either of the condition that the generated torque of the engine is approximately zero or other conditions are met in the condition other than those where the required load of the engine is small. The condition that the generated torque is approximately zero is preferential to other conditions and realized, and the engine 2 is stopped by other conditions, and at the same time, the engine 2 is stopped and the clutch 42 is released according to the condition that the generated torque is approximately zero when the condition that the generated torque is approximately zero is met with the starting clutch 42 being released. Thus, the economy running time with the throttle being low is increased, and the operational performance is improved.

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, particularly to reduce the fuel consumption amount at a low throttle to increase the driving opportunity to sufficiently reduce the fuel consumption amount and to improve the driving performance. The present invention relates to a control device for an engine.

[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.

In the engine of this vehicle, in order to perform a so-called eco-run operation in order to reduce the fuel consumption, the engine is automatically stopped and started when the eco-run operation determination is established during traveling. Some are equipped with an engine stop and start device.

This engine stop / start device is provided, for example, in an engine connected to a transmission equipped with a clutch. In such an engine stop / start device, as a state determination method for performing the eco-run operation, firstly, a method of connecting the clutch and stopping the fuel supply when the throttle is fully closed, and secondly, the throttle fully closed. To release the clutch and prepare to stop the vehicle at a low vehicle speed, and thirdly, to perform an eco-run operation when the engine generated torque is near zero (0 kgm) corresponding to the throttle opening with respect to the vehicle speed at a low throttle speed. Fourth, a method for performing eco-run operation by determining the driver's intention to decelerate from the throttle opening with respect to the vehicle speed during deceleration and deceleration of the vehicle, and fifth, a throttle opening with respect to the vehicle speed during constant speed traveling And there is a method of decelerating the vehicle to determine the driver's willingness to drive at a constant speed and perform eco-run driving.

The state transition of this eco-run operation is shown in FIG.
Is shown in.

Further, such an engine stop / start device is disclosed, for example, in JP-A-4-246252, JP-A-4-358729, and JP-A5-1592. Japanese Patent Application Laid-Open No. 4-246252 discloses automatic restart control of an engine by operating a starter when a predetermined starting condition is satisfied when an accelerator pedal is depressed while the engine is stopped. is there. 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 Laid-Open No. 5-159
The one disclosed in Japanese Patent No. 2 publication satisfies the stop condition that the vehicle is in a stopped state while the engine is operating, that the clutch pedal is in a depressing operation state below a predetermined level, and that the electric device is in a non-energized state. Control to stop the engine in the case of, and control to start the engine if the start condition that the clutch pedal is stepped on beyond a predetermined level after the engine is stopped due to the satisfaction of this stop condition, When the prohibition condition that the vehicle does not continue at the set vehicle speed or higher for a predetermined time or longer after the engine is started by the satisfaction of the start condition is satisfied, the engine stop is prohibited by the satisfaction of the stop condition.

[0007]

However, conventionally, in the so-called eco-run operation in which the fuel consumption is reduced, the vehicle is operated by releasing the clutch at a fully closed throttle, which is the second method, and at a low vehicle speed. In the case of preparing for the stop of No. 2, since it is limited to a state in which the vehicle speed shifts only when the vehicle speed is extremely low, it is possible to directly use this second method from the above-mentioned third method, fourth method, and fifth method. With the method, the clutch could not be released when the throttle was fully closed, and the vehicle could not go into a state where it was prepared to stop the vehicle at a low vehicle speed.
Further, as shown in FIG. 10, even if the low throttle condition is satisfied during the eco-run operation by the above-mentioned first method, fourth method, and fifth method, the above-mentioned Since the shift to the eco-run operation at the time of the low throttle of the third method is performed, the eco-run operation time is shortened, the fuel consumption cannot be sufficiently reduced, and the operation performance is deteriorated.

[0008]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention is provided with an engine mounted on a vehicle connected to a transmission equipped with a startable clutch that can be connected and released. A condition that the engine generated torque is substantially zero except for a region where the engine required load amount is small, provided with an engine stop and start control device that automatically stops and starts the engine when the automatic stop and start condition of the engine is satisfied, or When either one of the other conditions is satisfied, the engine is stopped and the starting clutch is released, and the condition in which the engine generated torque is substantially zero is given priority over the other conditions. The engine is stopped and the starting clutch is released, while the engine is stopped and the starting clutch is released according to the other conditions. When the condition that the engine generated torque is substantially zero is satisfied while the engine is being operated, a control means is provided for stopping the engine and releasing the starting clutch according to the condition that the engine generated torque is substantially zero. And

[0009]

According to the structure of the present invention, the control means, when the engine generated torque is substantially zero or other conditions, is satisfied except for a region where the required engine load is small. Stops the engine and releases the starting clutch, gives priority to the condition that the engine torque is substantially zero over other conditions to stop the engine and releases the starting clutch, while stopping the engine under other conditions Also, when the condition that the engine generated torque is substantially zero is satisfied while the start clutch is released, the engine is stopped and the start clutch is released under the condition that the engine generated torque is substantially zero.
As a result, when the engine generated torque becomes substantially zero during the normal operation or the operation for reducing the fuel consumption amount, immediately,
Shift to operation to reduce fuel consumption at low throttle, increase opportunities for operation to reduce fuel consumption at low throttle, extend operation time to reduce fuel consumption, and ensure sufficient fuel consumption. And the driving performance can be improved.

[0010]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 to 9 show an embodiment of the present invention. In FIG. 7, 2 is an engine mounted on a vehicle (not shown), 4 is a control device for the engine 2, 6 is an intake manifold, 8 is an intake passage, 10 is a fuel injection valve, 12 is a throttle valve, and 14 is an air cleaner. , 16
Is the starter. A transmission (continuously variable transmission: CVT) 20 having a transmission unit 18 is connected to the engine 2. The transmission 20 includes a drive pulley 22, a driven pulley 24, and a belt 26 wound around the drive pulley 22 and the driven pulley 24.

The drive pulley 22 includes a drive shaft 28 and a drive side fixed pulley portion piece 3 integrally provided on the drive shaft 28.
0, and a drive-side movable pulley portion 32 provided on the drive shaft 28 so as to be axially movable and non-rotatable.

The driven pulley 24 includes a driven shaft 34 arranged substantially parallel to the drive shaft 28, a driven-side fixed pulley portion 36 integrally provided on the driven shaft 34, and the driven shaft 3.
4 has a driven-side movable pulley piece 38 which is axially movable and non-rotatable.

The crankshaft 40 of the engine 2 and the transmission 20
Between the drive shafts 28 of the starting clutch 4 which can be connected and released.
2 are provided. The starting clutch 42 is, for example, integrally attached to the transmission 20. Further, the engine 2 is provided with an engine stop / start device 44 as shown in FIG. The engine stop starter 44 is
When the predetermined stop condition and start condition are satisfied, the control means 4
6, the engine 2 is automatically stopped and started.

That is, in the engine stop / start device 44, the control means 46 comprises a transmission control unit 48 and an engine control unit 50, and the transmission control unit 48 sends an engine stop request signal to the engine. When output to the engine control unit 50, the engine control unit 50 stops the operation of the fuel injection valve 10 to stop the fuel supply to the engine 2 and outputs an ignition control signal to the ignition plug 52, while transmitting the signal to the transmission. When the control unit 48 outputs a start signal to the starter 16, the starter 16 operates and the engine 2 starts.

More specifically, in the engine stop / start device 44, as shown in FIG. 9, during normal operation of the engine 2, the engine stop request signal is not output and the fuel injection valve 1
0 and the spark plug 52 are normally operated to control the engine 2 normally, and the starter 16 is stopped. Further, while the engine 2 is stopped, an engine stop request signal is output to stop the operation of the fuel injection valve 10 and the spark plug 52,
The starter 16 is stopped. Furthermore, when the engine 2 is started, it is time to escape from the so-called eco-run operation in which the fuel consumption is reduced, the engine stop request signal is not output, and the fuel injection valve 10 and the ignition plug 52 are normally operated to operate the engine. 2 is controlled normally, and the starter 16 is operating. The starter 16 can be operated during a manual start operation.

The control means 46, as shown in FIG.
An engine stopping device 54 for stopping the operation of the fuel injection valve 10, an engine starting device 56 for operating the starter 16, and a starting clutch device 58 for connecting and releasing the starting clutch 42 are provided on the output side. , Transmission section 18
Is in communication with a gear ratio adjusting device 60 for adjusting the gear ratio.

The gear ratio adjusting device 60 is electrically operated by the control means 46 in order to properly control the gear shift of the transmission 20 when the starting clutch 42 is disengaged while the vehicle is traveling. It is what is done.

Further, as shown in FIG. 7, the control means 46 has a throttle opening sensor 62 for detecting the throttle opening (θ) of the throttle valve 12 on the input side and the rotation of the crankshaft 40 for the engine rotation speed. The engine rotation speed sensor 64 that detects (Ne), the transmission section input rotation speed sensor 66 that detects the rotation of the drive shaft 28 of the transmission 20 as the transmission section input rotation speed (Ni), and the driven shaft 34 of the transmission 20. The vehicle speed sensor 68 for detecting the rotation of the vehicle as a vehicle speed (Nv), the eco-run switch 70, the shift position switch 72, the power mode switch 74, and other detecting means are in communication with each other.

The control means 46 inputs various signals,
In a state other than the range where the engine load demand is small, for example, in a state other than the throttle fully closed condition, the engine generated torque is substantially zero (0 〓m) or other conditions (such as a driving operation state and a vehicle running state) 2) is satisfied, the engine 2 is stopped and the starting clutch 42 is released, and the engine 2 is stopped by giving priority to the condition that the engine generated torque is substantially zero over the other conditions. While the starting clutch 42 is released, the engine 2 is stopped under other conditions and the starting clutch 42 is released.
When the condition that the engine generated torque is substantially zero is satisfied while the engine is released, the engine 2 is stopped and the starting clutch 42 is released under the condition that the engine generated torque is substantially zero. That is, the control means 46
In the so-called eco-run operation, gives the highest priority to the operation for reducing the fuel consumption amount at the time of low throttle.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG. 1 and the time chart of FIG.

When the program is started in the control means 46 (step 102), first, it is judged whether or not a prohibition condition of operation for reducing the fuel consumption amount, so-called eco-run prohibition condition is satisfied or not satisfied (step 104).

Whether or not this eco-run prohibition condition is satisfied is determined as shown in FIG.

That is, in FIG. 3, when the program of the eco-run prohibition condition is started (step 202), it is first judged whether or not the eco-run switch 70 is turned on (step 204).

If YES at step 204,
It is determined whether the shift position switch 72 is drive (D) (step 206).

If YES at step 206,
It is determined whether the power mode switch 74 is on (step 208).

If NO at step 208, the eco-run prohibition condition is not satisfied (step 210).

On the other hand, if NO in step 204,
If NO in step 206, step 208
If YES is determined, it is assumed that the eco-run prohibition condition is satisfied (step 212).

After the processing of steps 210 and 212, the program of the eco-run prohibition condition is ended (step 214).

When the eco-run prohibition condition is satisfied in step 104 of FIG. 1, the engine 2 is controlled normally (step 106), and the starting clutch 42 is also controlled normally (step 108).

When the eco-run prohibition condition is not satisfied in step 104, it is determined whether or not the throttle full-close determination condition is satisfied (step 110).

Whether or not this throttle full-close determination condition is satisfied is determined as shown in FIG.

That is, in FIG. 4, when the program for the throttle fully closed determination condition is started (step 302), it is first determined whether or not the throttle is fully closed (step 304).

If YES at step 304,
It is assumed that the throttle fully closed condition is satisfied (step 30).
6).

If NO at step 304, it is assumed that the throttle fully closed condition is not satisfied (step 30).
8).

After the processing of steps 306 and 308,
The program for this fully closed throttle condition is set to end (step 310).

When it is determined in step 110 of FIG. 1 that the throttle full-close determination condition is satisfied, the engine 2 is stopped (step 112), and the starting clutch 42 is connected or released (step 114).

In this step 114, the reason why the starting clutch 42 is connected is to prevent the braking effect.
This is when the fuel stop control is being performed. Further, the starting clutch 42 is released only when the vehicle speed is low and the vehicle is stopped.

When it is determined in step 110 that the throttle fully closed determination condition is not satisfied, it is determined whether the determination condition that the engine generated torque is substantially zero (0 〓m) is satisfied or not satisfied (step 116).

Whether or not the condition under which the engine generated torque is substantially zero in step 116 is satisfied or not is determined as shown in FIG.

That is, in FIG. 5, the program of the judgment condition that the engine generated torque is substantially zero is started (step 4
02) Then, first, it is judged whether or not the eco-run operation is in progress based on the map of the rotation speed trigger for eco-run (step 404) (step 406).

If step 406 is NO and the eco-run operation is not in progress, the transmission input speed (N
i) is compared with the first eco-run entrance speed change section input rotation speed trigger (NiTRθ1) (step 408).

In this step 408, Ni ≧ NiTRθ1
In the case of, the transmission input speed (Ni) and the second eco-run entrance transmission input speed trigger (NiTRθ2)
And are compared (step 410).

In this step 410, Ni ≧ NiTRθ2
In the case of, the determination condition for the eco-run operation when the engine generated torque is substantially zero is not satisfied (step 412). If Ni <NiTRθ1 in step 408, the determination condition for the eco-run operation when the engine-generated torque is substantially zero is immediately unsatisfied (step 412).

On the other hand, when the step 406 is YES and the eco-run operation is being performed, the transmission input speed (Ni) is compared with the first eco-run escape transmission input rotation speed (NiTRθ3) ( Step 414).

In this step 414, Ni ≧ NiTRθ3
In this case, the speed change section input rotation speed (Ni) is compared with the second eco-run escape speed change section input rotation speed (NiTRθ4) (step 416).

In step 414, Ni <NiTRθ3
And if Ni ≧ NiTRθ4 in step 416, the process proceeds to step 412, and the determination condition for the eco-run operation when the engine generated torque is substantially zero is not satisfied.

In step 216, Ni <NiTRθ4
In this case, it is assumed that the determination condition for the eco-run operation when the engine generated torque is substantially zero is satisfied (step 418).
If Ni <NiTRθ2 in step 410, the process proceeds to step 418, and it is assumed that the determination condition for the eco-run operation when the engine generated torque is substantially zero is satisfied.

After the processing of steps 412 and 418, the program of the judgment condition of the eco-run operation when the engine generated torque is substantially zero is ended (step 420).

When it is determined in step 116 in FIG. 1 that the determination condition for the engine generated torque to be substantially zero is satisfied (see FIG. 2).
The engine 2 is stopped (step 118), and the starting clutch 42 is released (step 120).

If it is determined in step 116 that the determination condition for the engine generated torque being substantially zero is not satisfied, it is determined whether other eco-run operation conditions are satisfied or not (step 122).

The other eco-run operation conditions in this step 122 are to judge the driver's intention to decelerate from the throttle opening corresponding to the vehicle speed and the deceleration of the vehicle at the time of decelerating, or at the time of constant speed traveling. Is to determine the driver's intention to run at a constant speed from the throttle opening corresponding to the above and the deceleration of the vehicle.

When it is determined in step 122 that the other eco-run operation determination conditions are satisfied, the engine 2 is stopped (step 124) and the starting clutch 42 is released (step 126).

When it is determined in step 122 that the other eco-run operation determination conditions are not satisfied, the engine 2 is controlled normally (step 128), and the starting clutch 42
Is also controlled normally (step 130).

Steps 108, 114, 120, 1
After the processing of steps 26 and 130, the program ends (step 132).

As a result, in the conventional transition diagram of the eco-run traveling condition shown in FIG. 10, only the eco-run operation of connecting the starting clutch 42 is prioritized when the throttle is fully closed.

However, in this embodiment, as shown in FIG. 6, a transition indicated by a thick arrow can be added even at the time of the low throttle, and the priority at the time of the low throttle is established.

As a result, as shown in FIG. 2, when the engine generated torque is detected to be approximately 0 kgm as indicated by points a and b during the eco-run operation, the eco-run operation is immediately performed at the low throttle. , Can be migrated.

Therefore, the eco-run operation at a low throttle is not affected by running resistance (road gradient, change in friction coefficient, strength of air volume, change in vehicle characteristics, etc.)
Because it is an eco-run operation that depends only on the torque characteristics of
This embodiment increases the chances of shifting to the eco-run driving condition at the time of lower throttle than before, and as a result, the time of the eco-run operation is increased, the fuel consumption can be significantly reduced, and the driving performance is improved. Can be improved.

That is, in this embodiment, the eco-run operation is an engine stop system, and when the eco-run condition is satisfied, the starting clutch 42 can be released and the engine 2 can be stopped.

In addition, in this embodiment, the control means 4
This can be dealt with only by changing the program of No. 6, no additional hardware is required, the configuration is simple, and the cost can be reduced.

Further, the present invention can be applied to all transmissions equipped with an electronically controlled clutch such as the starting clutch 42, which can be practically advantageous.

[0062]

As is apparent from the above detailed description, according to the present invention, the engine generated torque is substantially zero except in the region where the required engine load is small, or one of the other conditions. If the condition is satisfied, the engine is stopped and the starting clutch is released, and the condition in which the engine generated torque is substantially zero is given priority over other conditions to stop the engine and release the starting clutch.
When the condition that the engine generated torque is substantially zero is satisfied while the engine is stopped and the start clutch is released under other conditions, the engine is stopped and the start clutch is generated by the condition that the engine generated torque is substantially zero. By providing the control means for releasing the engine, when the engine generated torque becomes substantially zero during the normal operation or the operation for reducing the fuel consumption, the operation immediately shifts to the operation for reducing the fuel consumption at the low throttle. It is possible to increase the chances of driving for reducing the fuel consumption amount at the time of the low throttle, lengthen the operating time for reducing the fuel consumption amount, sufficiently reduce the fuel consumption amount, and improve the driving performance.

Further, according to the present invention, it is possible to deal with it only by changing the program of the control means, no additional hardware is required, the structure is simple and the cost can be reduced.

Further, it can be applied to all transmissions provided with an electronically controlled clutch, which can be practically advantageous.

[Brief description of drawings]

FIG. 1 is a flowchart of engine control.

FIG. 2 is a time chart of engine control.

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 flowchart of a determination condition that the engine generated torque is substantially zero.

FIG. 6 is a transition diagram of eco-run traveling conditions.

FIG. 7 is a system configuration diagram of an engine control device.

FIG. 8 is a system configuration diagram of an engine stop / start device.

FIG. 9 is a diagram illustrating the operation of the engine stop / start device.

FIG. 10 is a transition diagram of conventional eco-run traveling conditions.

[Explanation of symbols]

 2 engine 4 control device 18 transmission unit 20 transmission 42 starting clutch 44 engine stop and start device 46 control means 62 throttle opening sensor

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[Procedure amendment]

[Submission date] November 8, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 6]

[Figure 8]

[Figure 10]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 9]

[Figure 5]

[Figure 7]

Claims (1)

[Claims] 1. A transmission equipped with a starting clutch that can be connected to and released from an engine mounted on a vehicle is connected to the engine, and the engine is automatically stopped when an automatic stop / start condition for the engine is satisfied. An engine stop start control device for starting control is provided, and when either one of the condition that the engine generated torque is substantially zero or the other condition is satisfied in a region other than the region where the engine required load amount is small, the engine is stopped. Stopping and releasing the starting clutch, prioritizing the condition that the engine generated torque is substantially zero over the other conditions to stop the engine and release the starting clutch, while depending on the other conditions, When the condition that the engine generated torque is substantially zero is satisfied while the engine is stopped and the starting clutch is released Is provided with a control means for stopping the engine and releasing the starting clutch under the condition that the torque generated by the engine is substantially zero.