JPH06200792A - Start/stop device for vehicle - Google Patents

Abstract

PURPOSE:To secure the proper charging time, surely protect a battery, and keep the fuel consumption satisfactory by measuring the time from the start to the stop of an engine, and changing the time to the automatic stop of the engine in response to the measured time and the operation state. 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 time from the start to the stop of the engine. The time to the automatic stop of the engine is changed in response to the measured time and the operation state.

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.

Further, there is one disclosed in JP-A-63-80027. 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 wiper motor that stops the wiper motor with a stop signal. And a stop circuit.

Further, there is 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 ignition control device by 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.

Further, there is one disclosed in Japanese Utility Model Publication No. 58-142338. The engine stop / start device for a vehicle disclosed in this publication stops the engine when it detects a predetermined setting condition for stopping the engine when the vehicle is stopped, and restarts the engine by a normal start operation after stopping the engine. Means are provided for adjusting the delay time until the engine is stopped after detecting the desired setting condition of the device capable of starting.

[0008]

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 automatic stop of the engine is prohibited for a certain period of time.

As a result, if the prohibition time is set to be short, the battery cannot be sufficiently charged during a traffic jam in which the time from starting to stopping the engine is short, and the battery may deteriorate. It is difficult to say that there is a disadvantage that it is disadvantageous in practical use.

If the prohibition time is set longer than necessary, the battery will be sufficiently charged, but it will be difficult to stop the engine and the fuel consumption, which is the original purpose of the vehicle start-stop system, will not be improved. However, there is a disadvantage that it is economically disadvantageous.

[0012]

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, measures the time from the start to stop of the engine, and measures the time of the next engine depending on this measured time and the operating state. It is characterized in that a control means for controlling the time until the automatic stop operation is changed is provided.

[0013]

According to the invention as described above, when the control means is activated, the time from the start to the stop of the engine is measured, and the time until the next automatic stop operation of the engine is changed according to the measured time and the operating state. The battery is fully controlled and the battery is fully charged, while improving fuel efficiency.

[0014]

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 time from the start to the stop of the engine is measured, and the time until the next automatic stop operation of the engine is determined by this measured time and the operating state. Is added, for example, a function for controlling to delay is added.

More specifically, the control means 4 inputs various detection signals from the input side engine rotation signal 6 for detecting the operating condition, the vehicle speed sensor 8, the clutch switch 10, the ERS switch 12 and the electric load 14, respectively. However, the output start relay is determined by determining the time until the next engine automatic stop operation and the engine stop / restart time based on the various detection signals and the measurement time that measures the time from engine start to engine stop. A control signal is output to 16 or the stop relay 18.

Further, the control means 4 has a timer unit (not shown) for measuring the time from the engine start to the engine stop, and from the engine restart to the engine stop.

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 operates and the control program starts.

Then, it is judged (100) whether or not the ERS switch 12 is ON. If this judgment (100) is NO, that is, if the ERS switch 12 is OFF,
Start relay 16 and stop relay 18 are respectively OF
F (136) 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 the determination (128) 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
To OFF (120).

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 if the determination (106) is NO, that is, the prohibition condition is not satisfied, whether the stop relay 18 is ON or not. If the judgment (106) is YES, the stop relay 18 OF which will be described later is turned off.
Move to F (120).

If the determination (108) as to whether the above-mentioned 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 (118), and judge (1
If 08) is NO, it is judged (110) whether the vehicle speed is in the non-input state for only one second.

If the determination (110) as to whether 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 it is judged (11)
If 0) is YES, the clutch switch 10 is OF
Whether or not it is F is determined (112).

Here, it is judged whether the vehicle speed is in the no input state for one second (110) or the clutch switch 10 is turned off.
The determination (112) is whether or not the driver has the intention of stopping and starting the vehicle.

If the above judgment (112) is NO,
Similar to the determination (110), the ignition (IG) no-input state, which will be described later, is shifted to the determination (122) whether 0.5 seconds has elapsed, and the determination (112) is Y.
In the case of ES, it is judged (114) whether or not a predetermined prohibition time has elapsed since the restart.

When the determination (114) is NO, the process proceeds to the determination (122) of whether or not the non-input state of the ignition (IG) described later has passed, for example, 0.5 seconds, and the determination (114). If is YES, the stop relay 18 is turned on (116) and the engine is stopped. That is, the above judgments (110), (112), (1
When 14) is NO, that is, when 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 (116), it is determined whether the ignition (IG) is not input for 0.2 seconds (118).
If the determination (118) 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 (11)
If 8) is YES, that is, if it is determined that the engine has completely stopped, the stop relay 18 is turned off (120). 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 no input state of the ignition (IG) is, for example, 0.
It is determined whether 5 seconds have passed (122) and whether the clutch switch 10 is ON (124),
If these judgments (122) and (124) are NO, it is considered that there is no intention to restart, and the process returns to the judgment (100) of whether the ERS switch 12 is ON, and the judgment (122), If each of (124) is YES, it is determined that there is a will to restart, the start relay 16 is turned on (126), 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 (128) and whether the clutch switch 10 is turned on for 0.1 second. Judgment (130) is performed and judgment (12
If 8) is NO, the clutch switch 10 is set to 0.1
If the determination (128) is YES, the start relay 16 is turned off (132).

If the judgment (130) is YES, it is judged whether the ERS switch 12 is ON (1
00), if the determination (130) is NO, the start relay 16 is turned off (132).
That is, the restart is completed when the determination (128) of whether the engine speed is 500 rpm or more is NO and the determination (130) of 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.

Further, after the start relay 16 is turned off (132), the prohibition time count is started (13
4) is performed, and initialization is performed to determine (114) whether a predetermined prohibition time has elapsed after restarting. Then, the process returns to the determination (100) as to whether the ERS switch 12 is ON.

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

This interrupt operation is an operation that occurs when the relay is ON, and sets an inhibition time used during the automatic stop determination of the engine.

When an interrupt operation occurs (200), it is judged whether the start relay 16 is ON (202). If this judgment (202) is YES, time measurement is started (204). , Performs the start processing of time measurement of the prohibited time, and shifts to the RTI (210).

When the above-mentioned judgment (202) is NO, it is judged whether the stop relay 18 is ON (206). When this judgment (206) is NO, the time measurement is performed. Is terminated and the prohibition time is set based on the measurement data (208), and the process proceeds to RTI (210). If the judgment (206) is YES, the RT is not set.
I (210).

FIG. 4 shows a method of setting such a prohibited time.
As shown in FIG. 5, a map showing the relationship between the measurement time and the prohibition time is set, arbitrary points A to F are set on this map at equal intervals, and the time data of these points A to F is stored in the control means 4. It is set in the data area of the read only memory (ROM) (see FIG. 5).

Data a to e corresponding to points A to F
The prohibition time can be determined by performing an interpolation calculation from the measurement time using the interval data X and the interval data X.

In this way, it is possible to measure the time from restart to stop and set the measured time data to delay the stop prohibition time immediately after the next restart, and when the engine operating time is short. In addition, the charging time at the time of the next operation can be lengthened, an appropriate charging time can be ensured, the battery can be surely protected, and it is practically advantageous.

Also, 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 good fuel economy, 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 in a vehicle equipped with an electronic fuel injection system, in which the fuel injection pulse is stopped to stop only the engine. It is possible.

Further, in the embodiment of the present invention, when the interrupt control flowchart is interrupted in the main control flowchart, the ON operation of the relay is detected and interrupted. It can also be interrupted when stopped.

[0049]

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 stop operation of the engine immediately after that for a predetermined time, the time from the start of the engine to the stop is measured, and the time until the next automatic stop operation of the engine is determined by this measured time and the operating state. Since control means to control to change is provided, the time from restart to stop can be measured and the stop prohibition time immediately after the next restart can be changed by that data, and the engine operating time can be shortened. In some cases, the charging time for the next operation can be lengthened to ensure an appropriate charging time, ensuring the protection of the battery and ensuring practical use. In addition to being advantageous, it is possible to avoid stopping the engine in the case of a traffic jam where the vehicle repeatedly stops and starts in a short time, and it is possible to maintain a good fuel economy and economically. It is advantageous. Further, since it is possible to deal with it only by changing the program in the control means, the structure is not complicated, the manufacture 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 a vehicle start / stop device.

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

FIG. 4 is a map showing the relationship between prohibited time and measured time.

FIG. 5 is a read-only memory (RO) of control means for time data of arbitrary points A to F taken at regular intervals on a map.
It is a figure which shows the state set to the data area of M).

[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]

[Figure 1]

[Figure 5]

[Fig. 2]

[Figure 3]

[Figure 4]

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 time from the start to the stop of the engine and changing the time until the next automatic stop operation of the engine according to the measured time and the operating state. A starting / stopping device for a vehicle characterized by: