JP3196512B2 - Automatic engine start / stop device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic start / stop device for an engine, and more particularly to a device for automatically starting an engine without performing a clutch connection process involving a creep process when a failure occurs. The present invention relates to an automatic engine start / stop device that performs a connection process involving a creep process of a clutch when a throttle opening of a throttle valve becomes a throttle opening other than a fully closed state after starting, thereby preventing battery deterioration.

[0002]

2. Description of the Related Art Some vehicles employ a vehicle start / stop device that can stop the engine when unnecessary stoppage and easily restart the engine by depressing a clutch.

The vehicle start / stop system automatically stops the engine when the stop time is relatively long, such as during a traffic jam or when waiting for a traffic light, that is, at an unnecessary stop, thereby improving fuel efficiency.

[0004] An automatic start / stop device for the engine is disclosed in Japanese Patent Application Laid-Open No. 58-28564. The technology disclosed in this publication captures detection outputs of various sensors or circuit units that detect the operation state of each part of a vehicle, and automatically stops or starts an engine under predetermined conditions based on these detection outputs. The engine automatic stop and start device captures battery voltage information when a predetermined time has elapsed after the output of the engine start signal, cancels the setting of the automatic stop and start function of the engine when the battery voltage is equal to or lower than the predetermined value, and executes the automatic stop and start function of the engine. Inadvertent release is eliminated, and the engine cannot be restarted.

[0005] Further, there is one disclosed in Japanese Utility Model Publication No. 24655/1995. What is disclosed in this publication is that, in an engine equipped with a torque converter continuously variable transmission, when the engine is stopped, the transmission is automatically shifted to a neutral position to be on standby for restart, and Detecting that the driver has put the transmission into the drive position for starting the vehicle and detecting that the accelerator pedal is not depressed, automatically energizes the starter, automatically restarts the engine, and This prevents the engine from over-rotating or suddenly starting at the time of restart, and facilitates automatic start.

[0006] Further, there is one disclosed in Japanese Utility Model Laid-Open No. Sho 58-169135. What is disclosed in this publication is
In an automatic engine stop and start device that captures detection outputs of various sensors or circuit units that detect the operation state of each part of the vehicle and automatically stops or starts the engine under predetermined conditions based on these detection outputs, The automatic stop of the engine is prohibited during a period in which the battery charge amount after the start is equal to or less than the battery discharge amount at the time of engine start.

[0007]

A conventional automatic start and stop device for a manual transmission (MT) determines occurrence of a failure such as deterioration of a battery during automatic stop or stop of a vehicle.

When a failure occurs, an automatic start is performed to prevent deterioration of the battery.

In an automatic start / stop device for a continuously variable transmission (CVT) or an automatic transmission (AT), automatic stop of the engine and control of clutch release when the vehicle is stopped are performed. (M
Automatic start control such as the automatic start / stop device for T) is not performed.

That is, in the automatic start and stop device for the continuously variable transmission (CVT) or the automatic transmission (AT), the creep control is performed, and the engine is automatically stopped in the clutch disengaged state by the vehicle stop determination. In addition, when the automatic start control such as the automatic start and stop device for the manual transmission (MT) described above is performed, there is a disadvantage that an unintended clutch connection is performed.

As a result, in the automatic start / stop device for the continuously variable transmission (CVT) or the automatic transmission (AT), even if the automatic start control such as the automatic start / stop device for the manual transmission (MT) described above is performed. However, a similar starting state could not be secured, and an improvement was desired.

[0012]

SUMMARY OF THE INVENTION Therefore, in order to eliminate the above-mentioned disadvantages, the present invention controls to automatically stop or start the engine according to the driving state of the vehicle and also controls the on / off state of the clutch. Automatic start / stop device for a continuously variable transmission or an automatic transmission engine having a creep control means for providing a throttle opening sensor for detecting a throttle opening of a throttle valve to determine occurrence of a failure If the automatic start condition is satisfied at the time of automatic stop of the engine when the vehicle stops by the output signals of the throttle opening sensor and the failure occurrence determination means, the automatic start process of the engine is performed and the creep process is performed. A clutch connection process is performed, and a failure occurs when the engine stops automatically when the vehicle stops. In this case, only the engine is automatically started without performing the clutch connection processing involving the creep processing, and when the throttle opening of the throttle valve becomes a throttle opening other than the fully closed state after the automatic start of the engine, Is characterized in that a function of performing a connection process involving the creep process of the clutch is added to the control means.

[0013]

According to the invention as described above, when the automatic start condition is satisfied at the time of automatic stop of the engine when the vehicle is stopped by the output signals of the throttle opening sensor and the failure occurrence determination means, the automatic engine start process is performed. In addition, when a failure occurs when the engine is automatically stopped when the vehicle is stopped, only the engine is automatically controlled by the control means without performing the clutch connection processing involving the creep processing. If the throttle opening of the throttle valve becomes a throttle opening other than the fully closed state after the automatic start of the engine, the control means performs a connection process involving a creep process of the clutch, and the creep control is performed. Deterioration of the battery is reliably prevented in the automatic start / stop device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

1 to 3 show an embodiment of the present invention. In FIG. 2, reference numeral 2 denotes an automatic start / stop device for a vehicle equipped with a continuously variable transmission (CVT) (not shown).

As shown in FIG. 2, the automatic start / stop device 2 has a control means 4. The control means 4 comprises a first control means 6 and a clutch ON / OF from the first control means 6.
And CVT second control means 8 for inputting an F request signal.

The first control means 6 includes an EPI diagnostic output (if necessary) and an electric load (if necessary).
Is input, and a water temperature sensor 10 (if necessary) for detecting a cooling water temperature, and an idle switch 1 which is turned ON at the time of idle opening of a throttle valve (not shown).
2 (if necessary) and a throttle opening sensor 14 for detecting the throttle opening of a throttle valve (not shown)
And a vehicle speed sensor 16 for detecting a vehicle speed, an engine speed sensor 18 for detecting an engine speed, and an alternator 20 (if necessary).

A first relay 24 for connecting the injector 22 to a battery (not shown) is connected to the first control means 6, and a second relay 28 for connecting the starter motor 26 to the battery (not shown). Is connected.

The second control means 8 is in communication with the clutch 30 and the speed change actuator 32.

The control means 4 receives electric signals from various sensors and switches, and controls to automatically stop or start the engine according to the driving state of the vehicle.

The control means 4 controls to automatically stop or start an engine (not shown) according to the driving state of the vehicle, and also controls the on / off state of the clutch 30.

Further, the control means 4 is provided with a fail occurrence determining means 34 for determining the occurrence of a failure, which is automatically controlled by the output signals of the throttle opening sensor 14 and the fail occurrence determining means 34 when the engine is automatically stopped when the vehicle is stopped. If the starting conditions are satisfied, the engine automatically starts and performs clutch connection processing with creep processing.If a failure occurs when the engine automatically stops when the vehicle stops, the clutch with creep processing is activated. Only the engine (not shown) is automatically started without performing the connection processing. If the throttle opening of the throttle valve becomes a throttle opening other than the fully closed state after the automatic start of the engine, the creep processing of the clutch 30 is performed. A function of performing a connection process is added to the control unit 4 and provided.

More specifically, the failure occurrence judging means 3
For example, when any one of the following conditions is satisfied (OR condition), it is determined that a failure has occurred. When the automatic stop state continues for a predetermined time (Xsec) (time when the battery is estimated to be deteriorated) When the battery voltage is low (for example, 8.5 V or less) When the electric load is large (detected by switches such as A / C and lights) )

As shown in FIG. 3, the control means 4 automatically starts only the engine after the occurrence of a failure without performing clutch connection processing involving creep processing. When the throttle opening of the clutch 30 becomes a throttle opening other than the fully closed state, a connection process involving a creep process of the clutch 30 is performed.

Further, when no failure occurs, the engine is started automatically when the automatic start condition is satisfied by depressing the throttle or the like, and the clutch 30 is connected after the automatic start of the engine.

Next, the operation will be described with reference to the control flowchart of the automatic engine start / stop system shown in FIG.

When the control program of the control means 4 starts (100), it is determined (102) whether or not the clutch 30 is in the released state during the automatic engine stop processing. In this case, the process proceeds to the judgment (104) as to whether or not a failure has occurred. If the judgment (102) is NO, the process proceeds to the end (118) of the control program.

If the judgment (104) as to whether or not the failure has occurred is YES, only the engine is automatically started (106) without performing the clutch connection processing involving creep processing, and the judgment is made. If (104) is NO, it is determined whether or not the automatic start condition is satisfied (10).
Move to 8).

Then, the automatic start process for only the engine (1)
After 06), it is determined whether or not the throttle opening of the throttle valve (not shown) is in the fully closed state (110). If this determination (110) is NO, the connection processing (creep processing of the clutch 30) is performed. 112), and the process is shifted to the end (118) of the control program.
Is YES, the control is shifted to the end (118) of the control program without connecting the clutch 30.

If the determination (108) as to whether or not the above-mentioned automatic start condition is satisfied is YES, an automatic engine start process (114) is performed and the clutch 3
After performing the connection process (116) of 0, the process is shifted to the end (118) of the control program, and the judgment (108) is N.
In the case of O, the process is shifted to the end (118) of the control program without performing the engine automatic start process (114) and the clutch 30 connection process (116).

Thus, the failure occurrence judging means 3
4, the occurrence of a failure can be reliably determined, and the reliability of the determination can be improved.

Further, the occurrence of a failure can be reliably determined by determining the occurrence of a failure when the automatic stop state continues for a predetermined time (Xsec) (the time when the battery is estimated to deteriorate).

Furthermore, the occurrence of a failure can be reliably determined by determining the occurrence of a failure when the battery voltage drops, for example, when the voltage drops to 8.5 V or less.

Further, the determination of the occurrence of a failure is made according to A /
By performing this operation when the electric load detected by a switch such as a switch C or a light becomes large, the occurrence of a failure can be reliably determined.

Further, as shown in FIG. 3, after the automatic start of the engine, the control means 4 controls the operation other than the full closing of the throttle.
That is, when the throttle opening becomes large, the clutch 30
The automatic start and stop device for the continuously variable transmission (CVT) or the automatic transmission (AT) in which the creep control is performed, and the manual transmission (MT) can also be performed. Like the one, it is possible to reliably prevent the deterioration of the battery, which is practically advantageous.

Further, if a part of the existing throttle opening sensor and control means is used as the failure occurrence determination means 34, it is possible to deal with it only by changing the control program, and the configuration may be complicated. In addition, the cost can be kept low, which is economically advantageous.

[0037]

As described above in detail, according to the present invention, there is provided creep control means for controlling to automatically stop or start the engine in accordance with the driving state of the vehicle and also for controlling the on / off state of the clutch. In an automatic start and stop device for an engine for a continuously variable transmission or an automatic transmission, a throttle opening sensor for detecting a throttle opening of a throttle valve is provided, and a fail occurrence determining means for determining occurrence of a failure is provided. When the automatic start condition is satisfied at the time of automatic stop of the engine when the vehicle is stopped by the output signal of the sensor and the failure occurrence determination means, the automatic start process of the engine and the clutch connection process involving the creep process are performed, and the vehicle If a failure occurs when the engine is automatically stopped when stopping, Only the engine is automatically started without performing the connection processing of this item, and if the throttle opening of the throttle valve becomes a throttle opening other than fully closed after the automatic start of the engine, the connection processing involving the creep processing of the clutch is performed. Since the function to be performed is added to the control means, the automatic start processing of the engine can be performed and the creep processing is performed if the automatic start condition is satisfied at the time of the automatic stop of the engine when the vehicle is stopped by the control means. Clutch connection processing can be performed, and if a failure occurs at the time of automatic stop of the engine when the vehicle stops, only the engine can be automatically started without performing the clutch connection processing involving creep processing, Connection with creep processing of the clutch when the throttle is not fully closed after automatic start of the engine Can be performed sense, CVT creep control is performed (CVT)
The automatic start and stop device for the automatic transmission (AT) is also practically advantageous, as in the case of the manual transmission (MT), because the battery can be reliably prevented from deteriorating. In addition, if a part of the existing throttle opening sensor or control means is used as a failure occurrence determination means, it is possible to deal with it only by changing the control program, and there is no fear that the configuration is complicated, and the cost is reduced. It can be maintained at low cost and is economically advantageous. Further, the occurrence of a failure can be reliably determined by the failure occurrence determination means, and the reliability of the determination can be improved.

[Brief description of the drawings]

FIG. 1 is a control flowchart of an engine automatic start / stop device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a device for automatically starting and stopping an engine.

FIG. 3 is a time chart of an automatic start / stop device of an engine, wherein (a) is a time chart showing a throttle opening, (b) is a time chart showing an engine rotation speed, and (c) is an intermittent clutch. It is a time chart which shows a state.

[Explanation of symbols]

 2 Automatic start / stop device 4 Control means 6 First control means 8 Second control means 14 Throttle opening sensor 16 Vehicle speed sensor 18 Engine rotation speed sensor 22 Injector 24 First relay 26 Starter motor 28 Second relay 30 Clutch 32 Transmission actuator 34 Failure occurrence determination means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60K 41/00-41/02 F02D 29/00-29/02 F16D 48/02

Claims (1)

(57) [Claims] 1. A non having creep control means also controls the engaged state of the clutch and controls so as to automatically stop or start the engine according to the operating state of the vehicle
In an automatic start and stop device for an engine for a step transmission or an automatic transmission, a throttle opening sensor for detecting a throttle opening of a throttle valve is provided, and a fail occurrence determining means for determining occurrence of a failure is provided. The automatic start condition at the time of the automatic stop of the engine at the time of the stop of the vehicle is established by the output signal of the vehicle and the failure occurrence determination means.
When the engine is standing, the engine starts automatically.
Perform clutch connection processing accompanied with the creep processing,
If a failure occurs at the time of automatic stop of the engine when the vehicle stops , the clutch connection accompanied by the creep processing is performed.
Only the engine is automatically started without performing the processing, and when the throttle opening of the throttle valve becomes a throttle opening other than the fully closed state after the automatic starting of the engine , the connection involving the creep processing of the clutch is performed.
An automatic start / stop device for an engine, wherein a function of performing processing is added to the control means.