JPH11257114A - Engine automatic stopping and starting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly set engine automatic starting timing by installing a sensor sensing motion of a preceding vehicle, adding a traveling state of this preceding vehicle to the starting conditions of engine automatic stopping and starting, and restarting the engine from an automatic stopped state in the case where the preceding vehicle starts traveling. SOLUTION: In an engine automatic stopped state, in the case where a preceding vehicle traveling feeling seat 9 has sensed that a preceding vehicle (being within the range of about 10 m ahead) comes to a traveling state the stoppage, an actuating signal is outputted to a shift switching arrangement from a controller 10, setting a shift lever position to a neutral position. In addition, an engine starting motor 12 is energized with current, cranking an engine 1. In the case where engine speed reaches to the rotational frequency being judgeable to be engine starting, current-energization to an engine starting motor 13 is stopped. Then with an accelerator pedal 8 operated, the shift lever position is selected to a drive position and thus traveling is statred.

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 a vehicle with an automatic transmission. It is.

[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. For this reason, the engine is stopped when certain conditions are satisfied, such as when the vehicle stops, to reduce the fuel consumption during a temporary stop, and when the predetermined conditions are satisfied during the stop, the engine is stopped. There is an automatic stop / start device for the engine that automatically starts again. At this time, the automatic start of the engine is automatically started according to the driver's intention, for example, depressing the accelerator, releasing the brake, etc. There are conditions. Such a device is described in, for example, Japanese Patent Application Laid-Open No. 9-60539.

[0003]

Under the conventional conditions for restarting the engine described above, the engine is restarted based on the driver's intention to start, and the driver may look aside. However, since the start operation such as depressing the accelerator pedal and the like is performed after the engine is restarted after noticing that the preceding vehicle has run, there is a problem that a time delay occurs before running.

It is an object of the present invention to provide an accurate automatic start control of an automobile for automatically stopping and starting an engine.

[0005]

A vehicle is provided with a sensor for detecting the movement of the vehicle in front of the vehicle. When the vehicle detects that the vehicle in front starts moving from a stopped state during automatic stop, a signal is sent from the sensor to the controller, Upon receiving the signal, the controller outputs a signal for switching the shift position of the automatic transmission to the neutral position to the shift switching device, and switches the shift position to neutral by the switching device, and from the controller to the engine start motor via a relay. An ON signal is sent to energize the engine start motor to restart the engine.

When the accelerator pedal is turned on after the completion of the engine start, a signal for switching to the drive position is output from the controller to the switching device, and the switching device switches the shift position to the drive position and travels.

With the above configuration, the engine can be started accurately when the engine needs to be restarted while the vehicle is automatically stopped in addition to the operation by the driver's will, the depression of the accelerator, the release of the brake, and the like.

[0008]

Embodiments of the present invention will be described below.

FIG. 1 shows an example of the configuration of an automatic engine stop / 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 shift lever for shifting a shift, a shift switching device 6 for automatically switching the shift lever, and sensors 7 and 8 for detecting shift positions, which determine whether or not the accelerator pedal 8 is depressed with an accelerator pedal. The accelerator switches 9 and 10 as detecting means are front vehicle running sensors for detecting the stop or running of the preceding vehicle.

Reference numeral 11 denotes a controller, an input port 111 for receiving output signals from the rotation sensor 4, the shift position sensor 7, the accelerator switch 9, and the front vehicle traveling detection sensor 9, and a signal from the input port 111. In accordance with a control program stored in a memory (ROM) 112, a central processing unit (CPU) 114 interconnected with a memory (RAM) 113 for performing data processing and an output for transmitting an output signal of the CPU 114 to the outside. And a port 115.

When the CPU 114 determines that the restart condition of the engine 1 is satisfied, an output signal is sent from the output port 115 to the relay 12, and the relay 12 is turned on.
By doing so, the engine start motor 13 is rotated to start the engine 1. When the shift switching condition of the automatic transmission 14 is satisfied, an output signal is sent from the output port 115 to the shift switching device 6 to switch the shift lever 5.

FIG. 2 schematically shows the starting conditions in such an engine starting device.

In the engine automatic stop state S1, the front vehicle running sensor 10 detects that the preceding vehicle (for example, a front vehicle within a range of about 10 m) has changed from the stopped state to the running state. Controller 11
When it is determined that the failure is not found in the failure diagnosis in the step S3, the controller 11 sends the shift switching device 6
At S4, and the shift lever position is set to the neutral position in S4.

At this time, power is supplied to the engine start motor 13 in step S5, and the number of rotations of the engine 1 is determined by the rotation sensor 4 as the number of rotations at which the engine 1 can be determined to be started.
For example, when a rotation of 600 r / min or more is detected, it is determined in S6 that the engine 1 has been started, and the energization of the engine start motor 13 is stopped S7, and the engine start is completed S8.

After the start of the engine 1, the depression of the accelerator pedal 8 is detected by the accelerator switch 9 at step S9.
In this case, the shift lever position is changed to the drive position in S10, and after switching to the drive position, the automatic start mode is ended S11 and the normal operation mode S12 is performed.
Becomes In this case, even if the preceding vehicle does not change from the stopped state to the running state, the accelerator pedal 8 is driven by the driver's will.
When an operation such as stepping on is performed, the engine start motor 13 is started by energizing the engine start motor 13 because no failure is found by the failure diagnosis in the controller 11 in S3.
(S4 to S12). The present starting condition is also effective when other starting conditions are added.

[0016]

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 a state in which the vehicle must be in a state, that is, an automatic stop state when the preceding vehicle starts running, it is possible to provide an accurate engine automatic start timing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an automatic engine starting device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of an automatic engine start of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Crankshaft, 3 ... Disc gear, 4 ... Rotation sensor, 5 ... Shift lever, 6 ... Shift switching device, 7
... Shift position detection sensor, 8 ... Accelerator pedal,
9 ... accelerator sensor, 10 ... vehicle running ahead sensor
11 Controller, 12 Relay, 13 Engine start motor, 14 Automatic transmission, 111 Input port, 112 Memory (ROM), 113 Memory (RA
M), 114: central processing unit, 115: output port, S1: engine automatic stop state, S2: state in which the traveling state is sensed by the sensor from the stop state of the preceding vehicle, S3
… No failure judgment by controller failure diagnosis,
S4: A shift lever position is set to a neutral position by a switching device. S5: A state in which energization of the engine start motor is started. S6: A state in which rotation equal to or higher than the engine start rotation speed is detected by a rotation sensor. S7: An engine start motor. S8: The engine has been started, S9: The depression of the accelerator pedal is detected by the accelerator switch, S10: The shift lever position is set to the drive position, S11.
... End of automatic start mode, S12 ... Normal operation mode.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G08G 1/16 G08G 1/16 E

Claims (2)

[Claims] When a predetermined stopping condition is satisfied, the controller automatically stops the engine of the automobile and when a predetermined starting condition, for example, a condition such as releasing a brake, depressing an accelerator pedal, etc. is satisfied. An engine automatic stop / start device in which the controller automatically starts the engine, provided with a sensor capable of sensing a stop / run state of a vehicle located ahead of the driving vehicle, that is, a preceding vehicle, while the engine is stopped by the automatic stop; The sensor sends a signal to the controller when the sensor detects a running state from the stop of the vehicle in front, and sends a signal to the shift switching device to switch the shift position of the automatic transmission to the neutral position from the controller. The device automatically switches to the neutral position and sends a signal from the controller. Engine automatic stop and start system that is characterized in that to automatically start the output to the engine energizes the motor for engine start. 2. The automatic engine stop / start device according to claim 1, wherein the controller detects the depression of an accelerator pedal after the start is completed, and when the accelerator pedal is depressed, the controller shifts the shift position of the automatic transmission to the drive position. An automatic stop / start device for an engine, characterized in that a signal for switching to the drive position is output, and the drive device is automatically switched to the drive position for running.