JPH06200791A - Start/stop device for vehicle - Google Patents

Abstract

PURPOSE:To surely protect a battery and a starter and keep the fuel consumption satisfactory by measuring the number of stops of an engine in the prescribed period, and changing the time to the automatic stop of the engine in response to the measured number of stops of the engine. CONSTITUTION:A control means 4 receives various detection signals from the engine rotation signal 6, a vehicle speed sensor 8, a clutch switch 10, an ERS switch 12, and an electric load 14 respectively, and it outputs various control signals based on various detection signals to a start relay 16 and a stop relay 18 respectively. An engine is stopped in the prescribed operation state when a vehicle is stopped, the engine is restarted in response to the depression of a clutch, and an automatic stop action is prohibited for a prescribed period immediately after the restart. The control means 4 measures the number of stops of the engine in the prescribed period. The time to the automatic stop of the engine is changed in response to the measured number of stops.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle start / stop device, and more particularly, to operating the engine to stop the engine in a predetermined operating condition when the vehicle is stopped and restarting the engine by depressing a clutch. The present invention relates to a vehicle start / stop device.

[0002]

2. Description of the Related Art Some vehicles employ a start / stop system for a vehicle that can stop the engine when it is not necessary to stop and can easily restart the engine by depressing a clutch.

Further, this vehicle start-stop device automatically improves the fuel efficiency by automatically stopping the engine when there is a comparatively long stop time such as during traffic jam or waiting for a signal, that is, when unnecessary stop.

An example of the vehicle start / stop device is disclosed in Japanese Patent Application Laid-Open No. 63-75323. The vehicle automatic stop / start device disclosed in this publication drives the starter motor when the engine is in the off-idle state when the engine is stopped when the ignition switch is in the ignition position by detecting the stop-rotation and idle-off idle of the engine. The starter motor energization control circuit, the vehicle stop-running detector for discriminating and detecting running, the stop circuit controller that maintains an inactive state when the vehicle is running by an electric signal from the run detector, and the stop circuit controller A delay circuit that outputs a stop signal after a lapse of a predetermined time when the vehicle is stopped, and a stop signal controller that allows the delay circuit to generate a stop signal when the clutch of the engine power transmission device is disengaged or the transmission is in the neutral position. , An engine stop circuit that stops the engine with a stop signal and a headlight that turns off the headlight with a stop signal And a road.

There is also one disclosed in Japanese Utility Model Publication No. 24655/1990. An automatic start / stop system for an engine disclosed in this publication includes an automatic transmission that uses a torque converter, a shift lever that selects a drive position and a neutral position of the automatic transmission to switch the shift position, and a starter that starts the engine. In the case where zero vehicle speed is detected by the vehicle speed detecting means after the engine is started, the starter control device for controlling the energization control of the vehicle, the ignition control device for controlling the energization of the ignition ignition circuit, the vehicle speed detecting means for detecting the vehicle speed of the vehicle. When I turn on the ignition control device and stop the engine. Both, the stop control means for shifting the shift lever to the neutral position after the engine is stopped, and the operation of the ignition control device when the shift lever is shifted to the drive position and the accelerator is not stepped on after the engine is stopped by the stop control means There is restart control means for energizing the starter by operating the starter controller while energizing the ignition circuit.

[0006]

By the way, in the conventional vehicle start-stop system, the engine is stopped and the clutch is disengaged when the clutch is opened, the engine speed is in the idle state, and no electric load is applied. Some are restarted by the stepping action of.

When the clutch is depressed to restart the engine, the engine is controlled so as to be prohibited from being automatically stopped for a certain period of time.

As a result, in the case of a system in which the automatic stop of the engine is prohibited for a certain period of time, the time from the stop of the engine to the restart is short, and that state may frequently occur. There is a disadvantage in that the fuel consumption, which is the original purpose, cannot be improved, which is economically disadvantageous, and the durability and driving feeling of the starter are deteriorated, which is a disadvantage in practical use.

[0009]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention operates to stop the engine when the vehicle is in a predetermined driving state when the vehicle is stopped, and the engine is operated by depressing the clutch. In a vehicle start-stop system that restarts and prohibits the automatic stop operation of the engine immediately after restarting for a predetermined time, the number of times the engine is stopped within a predetermined time is measured, and the engine is stopped according to the measured number of times the engine is stopped. It is characterized in that a control means for controlling to change the time until the automatic stop is provided.

[0010]

According to the invention as described above, when the control means operates, the number of times the engine is stopped within a predetermined time is measured, and the time until the engine is automatically stopped is changed according to the measured number of times the engine is stopped. It controls as much as possible to fully charge the battery and improve fuel efficiency.

[0011]

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

1 to 5 show an embodiment of the present invention. In FIG. 3, reference numeral 2 is a vehicle start / stop device, and 4 is a control means.

At the input side of the control means 4 of the vehicle start / stop device 2, an engine rotation signal 6 for detecting the state of an engine (not shown), a vehicle speed sensor 8 for outputting a signal corresponding to the actual vehicle speed, and a driver A clutch switch 10 for detecting a stepping operation of a clutch pedal (not shown), which serves as a switch at the time of restart in order to confirm the intention of starting and stopping the vehicle.
ER that decides the operation / stop / cancel of this system
S switch 12 and O of air conditioner (A / C) not shown
The electric loads 14 are connected to each other during N operation and when a headlight (not shown) is turned on.

A start relay 16 for rotating the starter and a stop relay 18 for cutting off the main power source to stop the engine are connected to the output side of the control means 4, respectively.

The control means 4 operates to stop the engine when the vehicle is in a predetermined operating state when the vehicle is stopped, restarts the engine by depressing the clutch, and automatically restarts the engine immediately after restarting. It has a function to prohibit the stop operation for a predetermined time.In addition to the above function, the number of times the engine has stopped within the predetermined time is measured and the time until the engine automatically stops according to the measured number of times the engine is stopped Is added, for example, a function is added to control so as to delay the time until the engine is automatically stopped by canceling the automatic stop.

More specifically, the control means 4 inputs various kinds of detection signals from the engine speed signal 6 on the input side for detecting the driving state, the vehicle speed sensor 8, the clutch switch 10, the ERS switch 12 and the electric load 14, respectively. However, based on these various detection signals and the number of times the engine has stopped measured within a predetermined period of time, it is determined whether or not the next automatic stop will be performed, and whether or not the next automatic stop will be cancelled.
The control signal is output to.

Next, the operation will be described with reference to the control flowchart of FIG.

When an ignition (IG) (not shown) of the engine is turned on, the control means 4 is activated and the control program is started.

Then, it is judged (100) whether or not the ERS switch 12 is ON. If the judgment (100) is NO, that is, the ERS switch 12 is OFF,
Start relay 16 and stop relay 18 are respectively OF
F (138) to return to judgment (100), and judgment (10
0) is YES, that is, when the ERS switch 12 is turned on, the process proceeds to a determination (102) as to whether the start relay 16 is turned on.

If this judgment (102) is YES,
The process proceeds to a determination (132) whether the engine speed is 500 rpm or more, which will be described later, and the determination (102) is NO.
In the case of, it is determined whether there is a vehicle speed sensor error (104)
I do.

Judgment as to whether or not this vehicle speed sensor error has occurred (10
4) is a prohibition condition when the vehicle speed sensor is out of order, and when the determination (104) is NO, the electrical load is O
It is judged whether or not it is N (106), and the judgment (10
If 4) is YES, the stop relay 18 described later
Is turned off (124).

The determination (106) as to whether or not the electric load is ON is made as to whether or not there is a vehicle speed sensor error (10).
Similar to 4), the prohibition condition is set when there is an electric load input, and the judgment (106) is NO, that is, when the prohibition condition is not satisfied, it is judged whether or not it is immediately after the start ( 108), and if this determination (108) is NO, it is determined whether the stop relay 18 is ON (1
10) is performed, and if the determination (108) is YES, the stop relay 18 described later is turned off (124).

If the determination (110) as to whether or not the stop relay 18 is ON is YES, it is determined whether or not the non-input state of the ignition (IG) described later has passed, for example, 0.2 seconds. Transition to judgment (122), and judgment (1
When 10) is NO, it is judged whether the vehicle speed is in the non-input state for 1 second (112).

When the determination (112) as to whether or not the vehicle speed is in the non-input state for only one second is NO, it is determined whether or not the non-input state of the ignition (IG) described later has passed, for example, 0.5 seconds. Whether or not (11)
If 2) is YES, the clutch switch 10 is OF
Whether or not it is F is determined (114).

Here, it is judged whether the vehicle speed is in the no input state for one second (112) or the clutch switch 10 is turned off.
The determination (114) as to whether or not is to determine whether or not the driver has the intention of stopping and starting the vehicle.

When the above judgment (114) is NO,
Similar to the determination (112), the ignition (IG) no-input state, which will be described later, is shifted to the determination (126) whether 0.5 seconds has elapsed, and the determination (114) is Y.
In the case of ES, 1 is added to the number of stops (116),
After that, it is judged whether the prohibition flag is 0 (118).
I do.

If the determination (118) is NO, the process proceeds to the determination (126) of whether or not the non-input state of the ignition (IG) described later has passed, for example, 0.5 seconds, and the determination (118). If is YES, the stop relay 18 is turned on (120) and the engine is stopped. That is, the above judgments (112), (114), (1
If 18) is NO, that is, if the condition is not satisfied, the process proceeds to determine whether the start relay 16 is ON (restart).

After the stop relay 18 is turned on (120), it is judged whether the ignition (IG) is not input for 0.2 seconds, for example (122).
If the determination (122) is NO, that is, if the engine stop is not completed, the process returns to the determination (100) whether the ERS switch 12 is ON, and the determination (12)
If 2) is YES, that is, if it is determined that the engine has completely stopped, the stop relay 18 is turned off (124). In this state, the stop relay 18 is turned on until there is no input.

Further, in order to determine whether or not to restart, the non-input state of the ignition (IG) is, for example, 0.
A determination (126) whether 5 seconds has elapsed and a determination (128) whether the clutch switch 10 is ON are performed. If these determinations (126) and (128) are NO, the Considering that there is no intention to start, the process returns to the determination (100) as to whether the ERS switch 12 is ON, and if the determinations (126) and (128) are YES,
It is judged that there is an intention to restart, and the start relay 16
Is turned on (130), and restart is started.

Next, in order to judge whether or not the restart is completed, it is judged whether the engine speed is 500 rpm or more (132) and whether the clutch switch 10 is turned on for 0.1 second. The determination (134) is performed. If the determination (132) is NO, the clutch switch 10
Is turned on for 0.1 second (134), and if the determination (132) is YES, the start relay 16 is turned off (136).

When the determination (134) is YES, it is determined whether the ERS switch 12 is ON (1
00), if the determination (134) is NO, the start relay 16 is turned off (136).
That is, the restart is completed when the determination (132) as to whether the engine speed is 500 rpm or more is NO and the determination (134) as to whether the clutch switch 10 is ON for 0.1 seconds is NO. It is determined that the start relay 1
6 is turned off. And ERS switch 1
The process returns to the determination (100) as to whether 2 is ON.

As described above, the engine is automatically stopped and restarted. Next, the interrupting flowchart of FIG. 2 will be described.

When an interrupt operation occurs at regular intervals (200), the prohibit flag is set / cleared depending on the state of the prohibit flag. That is, it is judged whether the prohibit flag is 1 (202). If the judgment (202) is NO, it is judged that the prohibit flag is not set, and the number of stops counted in the main routine is counted. Is determined to be greater than or equal to a first set value (COUNT1) set in advance (204).

If the judgment (204) is YES,
The prohibition flag is set to 1 (206), the stop count is cleared (208), and the process proceeds to RTI (210). If the determination (204) is NO, the stop count is cleared (208) and the next interrupt is executed. Is initialized and is transferred to the RTI (210).

When the determination (202) is YES, that is, when the prohibition flag is set, the number of stops is set to a second set value (COU) set in advance.
It is judged (212) whether it is smaller than NT2),
If this determination is YES, the prohibition flag is set to 0, the prohibition flag is cleared, and the process (208) is entered. When the determination (212) is NO, the direct processing (20
It has moved to 8).

Since the process (116) of adding the number of stops is performed before checking the prohibition flag,
The former stop count is the actual stop count, while the latter stop count is the stop count.

Thus, the number of times the engine has stopped within a predetermined time can be measured, and the measured data can be set to determine whether or not to automatically stop immediately after the next restart. If it's a short time,
By releasing the automatic stop of the engine, the charging time at the next operation can be lengthened and an appropriate charging time can be secured, and the battery and starter can be reliably protected, which is practically advantageous. .

Further, in the case of a traffic jam where the vehicle repeatedly stops and starts in a short time, it is possible to avoid stopping the engine, maintain the fuel consumption in a good state, and economically. It is advantageous.

Further, since it can be dealt with only by changing the program in the control means 4, the structure is not complicated, the manufacture is easy, the cost can be reduced, and it is economically advantageous. .

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, the start / stop device of the present invention is also used for an engine mounted on a vehicle, which employs an electronic fuel injection system, and has a structure in which only the engine is stopped by stopping the fuel injection pulse. It is possible.

Further, in the embodiment of the present invention, the interrupting flowchart for judging the execution or cancellation of the next automatic stop according to the number of times of stop is used, and the engine is stopped according to the number of times of stop of the engine measured within the predetermined time. Although the control is performed so as to change the time until the automatic stop, the interrupt flow chart shown in FIG. 4 is used to delay the time until the next automatic stop of the engine, and the engine measured within a predetermined time is used. It is also possible to control to change the time until the engine is automatically stopped according to the number of times of stop.

By the way, when the interruption operation occurs (300), it is judged whether or not it is in delay (30).
2) is performed, and if this determination (302) is NO, it is determined (312) whether or not the time for counting the number of times described later has elapsed. The delay time of the judgment (302) is
As shown in FIG. 5, it is set corresponding to the number of engine stops.

When the judgment (302) is YES, the number of times the engine is stopped is the second set value (COUNT).
It is determined (304) whether or not it is less than T2. If this determination (304) is YES, the prohibition flag is set to 0 (306), and the process proceeds to the determination (312) described later.

If the judgment (304) is NO, it is judged (308) whether or not a predetermined delay time which is a delay time has elapsed. If this determination (308) is NO, the process proceeds to the determination (312) described later, and the determination (308)
Is YES, the prohibition flag is set to 0 (310),
It is determined whether the count time has elapsed (312). If the determination (312) is NO, the RTI (3
20).

If the judgment (312) is YES,
A determination (314) is made as to whether or not the number of stops is equal to or greater than a first set value (COUNT1). If this determination (314) is NO, processing for clearing the number of stops (3
If the determination (314) is YES, the delay time is set based on the number of stops and the setting data, and the number of stops is cleared (318) after setting the prohibition flag to 1 (316). RTI (32
0).

As a result, similarly to the above-described embodiment, the number of times the engine is stopped within a predetermined time can be measured, and the measured data can be set to delay the time until the next automatic stop. If the operating time is short, the charging time at the next operation can be extended by delaying the time until the next automatic stop, and the appropriate charging time can be secured. Can be surely achieved, which is practically advantageous.

Further, as in the above-described embodiment, in the case of a traffic jam in which the vehicle repeatedly stops and starts in a short time, the engine may be stopped by delaying the time until the next automatic stop. It can be avoided and the fuel consumption can be maintained in a good state, which is economically advantageous.

Further, as in the above-mentioned embodiment, since it can be dealt with only by changing the program in the control means, the structure is not complicated and the manufacture is easy.
The cost can be reduced, which is economically advantageous.

[0050]

As described in detail above, according to the present invention, when the vehicle is stopped, the engine is operated so as to be stopped in a predetermined operating state, and the engine is restarted by the depression operation of the clutch and is restarted. In a vehicle start-stop system that prohibits the automatic engine stop operation immediately after that for a predetermined time, the number of times the engine is stopped within a predetermined time is measured, and the time until the engine is automatically stopped is determined according to the measured number of engine stops. Since the control means for controlling to change is provided, it is possible to measure the number of times the engine is stopped within a predetermined time, and change the time until the engine is automatically stopped according to the measured number of times the engine is stopped. If the operating time of is short, the charging time at the next operation can be lengthened to ensure an appropriate charging time. The protection of the tartar is surely achieved, which is practically advantageous, and it is possible to avoid stopping the engine in the case of traffic congestion such as when the vehicle repeatedly stops and starts in a short time, thus reducing fuel consumption. It can be maintained in good condition, which is economically advantageous. Further, since it can be dealt with only by changing the program in the control means,
The structure is not complicated, the manufacturing is easy, the cost can be reduced, and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a flow chart for controlling a vehicle start-stop system according to an embodiment of the present invention.

FIG. 2 is a flowchart for interruption of the vehicle start-stop system.

FIG. 3 is a block diagram of a vehicle start / stop device.

FIG. 4 is a flowchart for interruption of a vehicle start-stop system according to another embodiment of the present invention.

FIG. 5 is a diagram showing the relationship between the number of stops and the delay time.

[Explanation of symbols]

 2 Vehicle Start / Stop Device 4 Control Means 6 Engine Rotation Signal 8 Vehicle Speed Sensor 10 Clutch Switch 12 ERS Switch 14 Electric Load 16 Start Relay 18 Stop Relay

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[Procedure amendment]

[Submission date] March 3, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Fig. 2]

[Figure 3]

[Figure 1]

[Figure 4]

[Figure 5]

Claims (1)

[Claims] 1. When the vehicle is stopped, it is operated to stop the engine in a predetermined operating state, the engine is restarted by depressing the clutch, and the automatic stop operation of the engine immediately after restart is prohibited for a predetermined time. In the vehicle start-stop system, the control means is provided for measuring the number of times the engine has stopped within a predetermined time and changing the time until the engine automatically stops according to the measured number of times the engine has stopped. A starting / stopping device for a vehicle characterized by: