JPH1130138A - Engine automatic stop / start device - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide an optimal automatic stop / start device for an automobile that automatically stops and starts an engine. A sensor for detecting the movement of a preceding vehicle is provided in an automobile, and when the preceding vehicle starts moving from a stop state during automatic stop, a signal is sent from the sensor to a controller, and the signal is received. The controller detects that the clutch switch is OFF and detects gear neutral, sends an ON signal to the engine start motor from the controller via a relay, and restarts the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically stopping and starting an engine, and more particularly to a condition for starting a device for automatically stopping and automatically starting an engine when a predetermined condition is satisfied in an automobile. .

[0002]

2. Description of the Related Art As a conventional technique, a vehicle generally stops at an intersection when traveling in an urban area or the like. In such a case, idling of an engine consumes fuel. Will increase.

[0003] Therefore, when certain conditions such as the stop of the vehicle are satisfied, the engine is stopped to reduce the fuel consumption during the temporary stop, and when predetermined conditions are satisfied during the stop. There is an automatic stop and start device for the engine for automatically starting the engine again. At this time, the driver's will,
For example, there are automatic start conditions of the engine based on conditions such as depression of a clutch pedal and depression of an accelerator.

For example, Japanese Patent Application Laid-Open No. 9-60539
Publication.

[0005]

Under the conventional conditions for restarting the engine described above, the engine is restarted based on the driver's intention to start.
Therefore, the driver restarts the engine by starting operation such as depressing a clutch pedal after the driver looks aside and the vehicle in front starts to move, and runs after the engine is started. There was a problem of causing a time delay.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optimum automatic start control of an automobile which automatically stops and starts an engine.

[0007]

A sensor for detecting the movement of a vehicle in front is provided in an automobile. When the vehicle starts moving from a stopped state during automatic stop, a signal is sent from the sensor to a controller. When the controller receives the signal, the clutch is not depressed, that is, when the clutch switch is OFF and the gear is neutral, that is, when it is determined that the gear is in the neutral position by the neutral position detecting unit, the controller transmits the signal to the engine start motor via a relay. By sending an ON signal, the engine start motor is energized to restart the engine.

With the above-described configuration, the engine can be started properly when the engine needs to be restarted while the vehicle is automatically stopped in addition to the operation by the driver, the depression of the clutch, the depression of the accelerator, and the release of the brake.

[0009]

Embodiments of the present invention will be described below.
FIG. 1 shows an example of the configuration of an automatic engine stop and start device. A disk gear 3 is attached to a crankshaft 2 of a power transmission unit of the engine 1, and has a rotation sensor 4 as a means for detecting the rotation speed of the engine 1 from the rotation of the disk gear 3. Reference numeral 5 denotes a clutch switch for detecting whether or not the clutch pedal 5 is depressed by the clutch pedal. Reference numerals 6 and 7 denote shift levers for gear change, and a neutral for detecting a neutral position of the gear. The switches 8 and 9 are front-vehicle traveling detection sensors for detecting stop or traveling of the preceding vehicle.

Reference numeral 10 denotes a controller, an input port 101 for receiving output signals from the rotation sensor 4, the clutch switch 6, the neutral switch 8, and the front vehicle traveling detection sensor 9, and a signal received from the input port 101. In accordance with a control program stored in a memory (ROM) 102, a central processing unit (CPU) 104 interconnected with a memory (RAM) 103 for performing data processing and the CPU 1
Output port 105 for transmitting the output signal of 04 to the outside
It is composed of

When the CPU 104 determines that the restart condition of the engine 1 is satisfied, the output signal is output to the output port 1.
05, the relay 11 is turned on, and the relay 11 is turned on to rotate the engine start motor 12 to start the engine 1.

FIG. 2 schematically shows the starting conditions in such an engine starting device. In the engine start / stop state S1, the gear is in the neutral S2 and the clutch pedal 5 is not depressed, and in S3, the forward vehicle (for example, a forward vehicle within a range of about 10 m) is changed from the stop state to the running state. When the vehicle detection sensor 9 detects S4, and when the failure diagnosis is not found by the failure diagnosis in the controller 10, all S5 are satisfied, the engine start motor 12 is energized S6, and the rotation speed of the engine 1 is reduced. When the rotation sensor 4 detects a rotation speed at which the engine 1 can be determined to be started, for example, a rotation speed of 600 r / min or more, it is determined in S7 that the engine 1 has been started and power is supplied to the engine start motor. Is stopped S8, and the engine start S9 is completed.

In this case, even if the preceding vehicle does not change from the stopped state to the running state, when the clutch pedal 5 is depressed by the driver's will, no failure is detected by the failure diagnosis in the controller 10, and the engine start for the engine is started. Power is supplied to the motor 12 to start the engine 1 (S6 to S9). The present starting condition is also effective when other starting conditions are added.

[0014]

As described above, according to the present invention, a sensor for detecting the movement of the vehicle in front is provided in the vehicle, and the running condition of the vehicle in front is added to the starting conditions for automatic engine stop and start. By restarting the engine from the state in which the vehicle must be in the state, that is, from the automatic stop state when the vehicle in front starts running, it is possible to provide an appropriate engine automatic start timing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an automatic engine start device.

FIG. 2 is a flowchart showing the flow of automatic engine start.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Crankshaft, 3 ... Disc gear, 4 ... Rotation sensor, 5 ... Clutch pedal, 6 ... Clutch switch, 7 ... Shift lever, 8 ... Neutral switch, 9
... Sensor for detecting vehicle running ahead, 10 ... Controller, 10
DESCRIPTION OF SYMBOLS 1 ... Input port, 102 ... Memory (ROM), 103 ... Memory (RAM), 104 ... Central processing unit, 105 ... Output port, 11 ... Relay, 12 ... Engine start motor, S1: Engine automatic stop state, S2 ... the gear is in a neutral state, S3 ... the clutch pedal is not depressed, S4 ... the state where the traveling state is detected from the stopped state of the preceding vehicle by a sensor, S5 ... the state where no failure is determined by the failure diagnosis of the controller, S6 ... for engine start A state in which energization of the motor is started, S7: a state in which rotation equal to or higher than the engine start rotational speed is detected by the rotation sensor, S8: a state in which energization to the engine starter motor is stopped, and S9: an engine start state.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tatsumi Nishida 2520, Oaza Takaba, Hitachinaka-shi, Ibaraki Automobile Division, Hitachi, Ltd.

Claims (1)

[Claims] 1. An engine control system for automatically stopping an engine of a vehicle when a predetermined stop condition is satisfied and automatically starting the engine when a predetermined start condition according to a driver's intention is satisfied. In the stop / start device, when the engine is stopped by the automatic stop, a sensor capable of detecting a stop / running state of a vehicle located in front of the driving vehicle is detected by the sensor when the stop / running state of the preceding vehicle is detected. When a signal is sent to the controller and it is established that the clutch pedal is not depressed and the gear is in neutral, the engine is automatically energized by applying a signal from the controller to the engine start motor. An automatic engine stop / start device, characterized in that it is configured to start the engine automatically.