JPH08291725A - Automatic stopping and restarting device for engine of vehicle - Google Patents

Abstract

PURPOSE: To provide an automatic stopping and restarting device for an engine of a vehicle which can be adopted to a vehicle on which an automatic transmission is mounted without influencing on a driver. CONSTITUTION: A select position sensor 14 is arranged on a select lever which has a drive range and a neutral range of an automatic transmission 13 senses switching to the drive range or the neutral range. A first controller 21 controls the automatic transmission 13 based on sensed output of the select position sensor 14. A vehicle speed sensor 17 senses vehicle speed. A rotation sensor 18 senses rotational speed of an engine 11. A brake sensor 19 senses whether or not a brake pedal is operated. A second controller 22 temporarily stops or restarts the engine 11 based on the sensed outputs of the select position sensor 14, the vehicle speed sensor 17, the rotation sensor 18 and the brake sensor 19.

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 and temporarily stopping and restarting an engine according to a driving condition of a vehicle.

[0002]

2. Description of the Related Art Conventionally, as this type of device, an electronic control unit for controlling operation is provided with a priority circuit, and a clutch sensor for detecting whether or not a clutch pedal is stepped on the control input of this priority circuit. The detection output of is connected with a sensor other than this sensor that detects vehicle operation,
When all the predetermined detection outputs of the sensors other than the clutch sensor that detect vehicle operation are input to the priority circuit, and the detection output of the clutch sensor that the clutch pedal is finally depressed is input to the priority circuit. Japanese Patent Laid-Open Publication No. Hei 4-13395 discloses an engine automatic stop starter in which an electronic control unit operates a starter to restart an engine. As a sensor for detecting vehicle operation other than the clutch sensor, a water temperature sensor for detecting engine cooling water temperature, a shift position sensor for detecting shifts to a plurality of gear stages or a neutral position of a manual transmission, and the like are shown as sensors for detecting vehicle operation. ing. In the engine automatic stop / start device configured as described above, the engine coolant restarts immediately after the clutch pedal is depressed with the engine coolant temperature at or above the predetermined temperature and the manual transmission in the neutral position. Therefore, the engine does not start when the driver does not intend, and it is possible to prevent the driver from being confused.

[0003]

However, although the above-described conventional engine automatic stop / start device can be used in a vehicle equipped with a manual transmission having a clutch pedal, the automatic transmission having no clutch pedal is provided. There was a problem that could not be adopted in the vehicle. Further, in the above-mentioned conventional engine automatic stop and start device, the engine restarts in the state where the manual transmission is in the neutral position, so the engine may restart even if the clutch pedal is inadvertently pressed while waiting for a signal. However, there was still room for improvement in the fuel consumption rate.

An object of the present invention is to provide an automatic engine stop and restart system for a vehicle which can be used in a vehicle equipped with an automatic transmission without burdening the driver. Another object of the present invention is to provide an automatic engine stop and restart device for a vehicle that can further improve the fuel consumption rate of a vehicle equipped with a manual transmission.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 5 corresponding to the embodiments. The first aspect of the present invention is to provide a select position sensor 14 provided on a select lever having at least a drive range and a neutral range of the automatic transmission 13 to detect switching to the drive range or the neutral range, as shown in FIG. It is an improvement of a vehicle that includes a first controller 21 that controls the automatic transmission 13 based on the detection output of the position sensor 14. Its characteristic configuration is that the vehicle speed sensor 17 for detecting the vehicle speed and the engine 11 are
Sensor 18 for detecting the rotation speed of the vehicle and brake sensor 1 for detecting whether or not the brake pedal is depressed.
9, the second position for temporarily stopping or restarting the engine 11 based on the detection outputs of the select position sensor 14, the vehicle speed sensor 17, the rotation sensor 18, and the brake sensor 19.
And a controller 22.

A second aspect of the present invention detects a vehicle speed sensor 17 for detecting a vehicle speed, a brake sensor 19 for detecting whether or not a brake pedal is depressed, and a rotational speed of the engine 11 as shown in FIG. The rotation sensor 18, a shift position sensor 54 that detects a shift of the manual transmission 53 to a plurality of gear stages or a neutral position, and a clutch sensor 60 that detects whether or not the clutch pedal is depressed.
An automatic engine stop and restart device for a vehicle, which includes a controller 61 that controls the engine 11 based on the detection outputs of the vehicle speed sensor 17, the brake sensor 19, the rotation sensor 18, the shift position sensor 54, and the clutch sensor 60. Is an improvement. The characteristic configuration is that the engine 11 is temporarily stopped, the vehicle speed sensor 17 detects that the vehicle speed is zero, the brake sensor 19 detects that the brake pedal is depressed, and the shift position When the sensor 54 detects that the transmission 53 is in the neutral position and the clutch sensor 60 detects that the clutch pedal is stepped on, the transmission position sensor 54 determines whether the transmission 53 is in a plurality of gear stages. The controller 61 is configured to restart the engine 11 when it is detected that the shift has been made to.

[0007]

In the automatic engine stop and restart system shown in FIG. 1, the select position sensor 14, the vehicle speed sensor 17, the rotation sensor 18 and the brake sensor 19 are such that the select lever is in the neutral range and the vehicle speed is zero. The second controller 22 temporarily stops the engine 11 when it detects that the rotation speed of the engine 11 is an idle rotation speed and that the brake pedal is depressed. When the engine 11 is temporarily stopped, the select position sensor 14, the vehicle speed sensor 17, the rotation sensor 18, and the brake sensor 19 indicate that the select lever is in the drive range, the vehicle speed is zero, and the engine 11 When it is detected that the rotation speed is zero and that the brake pedal is depressed, the second controller 22 electrically sets the automatic transmission 13 to the neutral range even though the select lever is in the drive range. The engine 11 is restarted in the held state, and the hold of the automatic transmission 13 in the electrical neutral range is released while the engine 11 is at the idling speed.

In the engine automatic stop and restart system shown in FIG. 5, the engine 11 is temporarily stopped, and the vehicle speed sensor 17, the brake sensor 19, and the shift position sensor 5 are provided.
4 and the clutch sensor 60, the vehicle speed is zero,
Brake pedal depressed, manual transmission 53
Is detected to be in the neutral position and the clutch pedal is depressed, and when the shift position sensor 54 detects that the manual transmission 53 is shifted to one of a plurality of gears, Controller 6
1 restarts the engine 11.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, an engine 11 mounted on a vehicle is a diesel engine in this example, and an automatic transmission 13 is connected to the engine 11 via a torque converter 12. Although not shown, the driver's seat is provided with a select lever having at least a drive range and a neutral range, and this lever is provided with a select position sensor 14 for detecting switching to the drive range or the neutral range. In this example, the drive range is a low range in addition to the normal drive range,
It also includes a second range and a reverse range. The detection output of the select position sensor 14 is connected to the control input of the first controller 21,
The control output of is connected to the automatic transmission 13. Further, the fuel injection amount of the fuel injection pump 16 that injects fuel into the engine 11 is controlled by the electronic governor 16a.

A main shaft 13a protruding from the automatic transmission 13 is provided with a vehicle speed sensor 17 for detecting the rotation speed of the shaft 13a, and a crankshaft 11a of the engine 11 is provided with a rotation sensor 18 for detecting the rotation speed of the shaft 11a. Further, a brake pedal (not shown) provided in the driver's seat is provided with a brake sensor 19 for detecting whether or not the pedal is depressed. Further, when the driver's seat is turned on, the system switch 23 that makes the engine automatic stop and restart device of the present invention operable, and the engine automatic stop and restart device are activated to temporarily stop the engine 11. An automatic stop lamp 24 that lights up to indicate the state is provided.

The respective detection outputs of the vehicle speed sensor 17, the rotation sensor 18, the brake sensor 19 and the system switch 23 are connected to the control input of the second controller 22, and the control output of the second controller 22 is the electronic governor 16a and the starter motor. It is connected to a starter switch 26 for starting 25 and an automatic stop lamp 24. The control output of the first controller 21 is connected to the control input of the second controller 22, and the detection output of the select position sensor 14 is input to the second controller 22. Further, the second controller 2
The control output of 2 is connected to the control input of the first controller 21, and a signal for electrically holding the automatic transmission 13 in the neutral range is input to the first controller 21 even though the select lever is in the drive range. .

The operation of the engine automatic stop and restart system of the vehicle thus constructed will be described with reference to FIGS. After the driver starts the engine 11 and turns on the system switch 23 to finish the warm-up operation of the engine 11, the vehicle (not shown) is driven at a predetermined vehicle speed z = 5 to 10 km.
/ Run at or above the hour. The condition that the vehicle is run once at a predetermined vehicle speed or higher is to prevent the automatic engine stop and restart device of the present invention from operating during warm-up operation of the engine 11. The vehicle temporarily stops when waiting for a signal, etc., and a driver depresses a brake pedal (not shown) to switch a select lever (not shown) to a neutral range (not shown).

At this time, the vehicle speed sensor 17 and the rotation sensor 1
8, brake sensor 19 and select position sensor 14
Is that the vehicle speed is zero, the rotation speed of the crankshaft 11a is an idle rotation speed, that is, x ₁ = 800 rpm or less, the brake pedal is depressed, and the select lever is switched to the neutral range. Since each of them is detected, the second controller 22 stops the fuel injection to the engine 11 by controlling the electronic governor 16a after the lapse of the above-mentioned various conditions based on these detection outputs and y seconds have elapsed. The engine 11 is stopped. At the same time, the second controller 22 turns on the automatic stop lamp 24. As a result, since the engine 11 is stopped when it is temporarily stopped due to waiting for a signal or the like, unnecessary fuel consumption is eliminated and the fuel consumption rate is improved.

When the vehicle is started by turning the signal to blue, the driver switches the select lever to the drive range while depressing the brake pedal. At this time, the vehicle speed sensor 17, the rotation sensor 18, the brake sensor 19
And the select position sensor 14 detects that the vehicle speed is zero, the rotation speed of the crankshaft 11a is zero, the brake pedal is depressed, and the select lever is switched to the drive range. , The second controller 22 electrically holds the automatic transmission 13 to the neutral range via the first controller 21 based on these detection outputs, even though the select lever is in the drive range. The starter switch 26 is turned on to operate the starter motor 25 and restart the engine 11.

After the engine 11 is started, the rotation speed of the crankshaft 11a is the idle rotation speed, that is, x ₂ = 300 rpm.
Or more and when x = ₁ 800 rpm is detected by the rotation sensor 18 that has become less and a brake sensor 19 that the brake pedal is depressed for confirmation is detected, the second controller 22 first controller 21 The hold of the automatic transmission 13 in the electrical neutral range is released via. At the same time, the second controller 22
Turns off the automatic stop lamp 24. As a result, the engine 11 is not restarted against the driver's intention, and the vehicle can be started smoothly.

FIG. 5 shows a second embodiment of the present invention. 5, the same reference numerals as those in FIG. 1 indicate the same parts. In this example,
The engine 11 mounted on the vehicle is a diesel engine in this example, and a manual transmission 53 is connected to the engine 11 via a clutch 52. This manual transmission 5
Although not shown, 3 is configured to be able to shift to a plurality of gear stages or neutral positions by switching a shift lever provided in the driver's seat. This transmission 53 detects shifts to the plurality of gear stages or neutral positions. A gear shift position sensor 54 is provided. Further, the engine 11 has an electronic governor 16a for controlling the fuel injection amount of the fuel injection pump 16 as in the first embodiment.

The main shaft 53a protruding from the manual transmission 53 is provided with a vehicle speed sensor 17 for detecting the rotational speed of the shaft 53a, and this pedal is stepped on a brake pedal (not shown) provided in the driver's seat. A brake sensor 19 for detecting whether or not the brake is applied is provided. The crankshaft 11a of the engine 11 is provided with a rotation sensor 18 for detecting the rotation speed of the shaft 11a, and a clutch pedal (not shown) provided in the driver's seat detects whether or not the pedal is depressed. The clutch sensor 60 is provided. Further, the system switch 23 is provided in the driver's seat as in the first embodiment.
And an automatic stop lamp 24 are provided. The shift position sensor 54, the vehicle speed sensor 17, the brake sensor 19, the rotation sensor 18, the clutch sensor 60, and the system switch 23.
Each detection output of is connected to the control input of the controller 61, and the control output of the controller 61 is the electronic governor 16
a, starter switch 26 and automatic stop lamp 24.

The operation of the engine automatic stop and restart system of the vehicle thus constructed will be described with reference to FIGS. The driver starts the engine 11 and turns on the system switch 23, and the warm-up operation of the engine 11 ends.
Further, a vehicle (not shown) is driven at a predetermined vehicle speed z = 5-10 km /
After the vehicle has run for more than an hour, the driver depresses a brake pedal (not shown) when the vehicle is temporarily stopped due to waiting for a signal or the like, and a shift lever (not shown) is switched to switch the manual transmission 53. Shift to the neutral position. At this time, the vehicle speed sensor 17, the rotation sensor 18, the brake sensor 19
And the shift position sensor 14 indicates that the vehicle speed is zero, and the rotation speed of the crankshaft 11a is the idle rotation speed, that is, x.
_{Since 1} = 800 rpm or less, the brake pedal is depressed, and the manual transmission 53 is switched to the neutral position, the controller 61 determines whether the above conditions are satisfied based on these detection outputs. By controlling the electronic governor 16a after the elapse of y seconds after being filled, the fuel injection to the engine 11 is stopped and the engine 11 is stopped. At the same time, the controller 61 turns on the automatic stop lamp 24.

When the vehicle is started with the signal changing to blue, etc., the driver switches the manual transmission 53 to a plurality of gear stages by switching the shift lever while depressing the brake pedal and the clutch pedal. Shift to one. At this time, the vehicle speed sensor 17 and the rotation sensor 1
8, the brake sensor 19, the clutch sensor 60, and the shift position sensor 54 indicate that the vehicle speed is zero, the rotation speed of the crankshaft 11a is zero, the brake pedal is depressed, and the manual transmission 53 is plural. Each of the shift positions is detected, and the controller 61 turns on the starter switch 26 and restarts the engine 11 based on these detected outputs. At the same time, the controller 61 turns off the automatic stop lamp 24. As a result, the engine 11 is restarted immediately before the driver tries to start the vehicle, so that the engine is restarted when the clutch pedal is depressed with the manual transmission in the neutral position. The fuel consumption rate of the engine 11 can be further improved as compared with the stop / start device.

An accelerator sensor for detecting whether or not the accelerator pedal is depressed may be used instead of the brake sensor for detecting whether or not the brake pedal is depressed in the first and second embodiments. Good. In this case, contrary to the brake sensor, the condition that the engine is temporarily stopped and restarted is that the accelerator sensor detects that the accelerator pedal is not depressed. An accelerator sensor may be used in addition to the brake sensor. In the first and second embodiments, the second controller of the first embodiment and the controller of the second embodiment control the electronic governor of the fuel injection pump to stop the fuel injection to the engine. Although the engine is stopped, the fuel injection pump having the mechanical governor is provided with the rotating means for rotating the control lever in addition to the cable connecting the clutch pedal and the control lever. The engine may be stopped by the controller and the controller of the second embodiment controlling the rotating means to rotate in the direction in which the injection of fuel into the engine is stopped.

Further, although the diesel engine is mentioned as the engine in the first and second embodiments, this is an example, and a gasoline engine may be used. In this case, the second controller of the first embodiment and the controller of the second embodiment turn off the ignition switch that electrically connects and disconnects the ignition circuit that operates the engine ignition device and the battery, or turns off the ignition circuit and the battery. The engine can be stopped by turning off a switch other than the ignition switch that connects and disconnects the circuit to be connected. Furthermore, the numerical values mentioned in the first and second embodiments are examples and are not limited to these numerical values.

[0022]

As described above, according to the present invention, the select position sensor for detecting the switching of the select lever of the automatic transmission, the vehicle speed sensor for detecting the vehicle speed, and the rotation sensor for detecting the rotational speed of the engine. And the second controller temporarily stops or restarts the engine based on the detection output of either or both of the brake sensor and the accelerator sensor that detect whether the brake pedal or the accelerator pedal is depressed. With this configuration, the engine is stopped while it is temporarily stopped due to waiting for a signal or the like, so that unnecessary fuel consumption is eliminated and the fuel consumption rate is improved. Further, when the vehicle is started with the engine temporarily stopped, the engine does not restart against the driver's intention, and the vehicle can be started smoothly. As a result, even in a vehicle equipped with an automatic transmission, the automatic engine stop and restart device can be adopted without imposing a burden on the driver.

In a vehicle equipped with a manual transmission,
When the engine is temporarily stopped, and one or both of the vehicle speed sensor, the brake sensor, the accelerator sensor, the gear shift position sensor and the clutch sensor detect the predetermined vehicle operating state, the gear shift position sensor is operated by the manual transmission. If the controller is configured to restart the engine when it detects that the gear has been shifted to one of multiple gears, the manual transmission will not be able to operate when the clutch pedal is depressed in the neutral position. The fuel consumption rate of the engine can be further improved as compared with the conventional engine automatic stop / start device in which the engine restarts.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an engine automatic stop and restart device for a vehicle according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the preceding stage of the apparatus.

FIG. 3 is a flowchart showing the operation of the middle stage of the apparatus.

FIG. 4 is a flowchart showing the operation of the latter stage of the apparatus.

FIG. 5 is a configuration diagram corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the preceding stage of the apparatus.

FIG. 7 is a flowchart showing the operation of the latter stage of the apparatus.

[Explanation of symbols]

 11 Engine 13 Automatic Transmission 14 Select Position Sensor 17 Vehicle Speed Sensor 18 Rotation Sensor 19 Brake Sensor 21 First Controller 22 Second Controller 53 Manual Transmission 54 Shift Position Sensor 60 Clutch Sensor 61 Controller

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[Procedure amendment]

[Submission date] August 8, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

An accelerator sensor for detecting whether or not the accelerator pedal is depressed may be used instead of the brake sensor for detecting whether or not the brake pedal is depressed in the first and second embodiments. Good. In this case, contrary to the brake sensor, the condition that the engine is temporarily stopped and restarted is that the accelerator sensor detects that the accelerator pedal is not depressed. An accelerator sensor may be used in addition to the brake sensor. In the first and second embodiments, the second controller of the first embodiment and the controller of the second embodiment control the electronic governor of the fuel injection pump to stop the fuel injection to the engine. the engine is stopped, but the fuel injection pump having a mechanical governor, the accelerator pedal and the machine
A rotation means for rotating the control lever is provided separately from a cable for connecting the control lever pivotally attached to the mechanical governor, and the second controller of the first embodiment and the controller of the second embodiment have the rotation. The engine may be stopped by controlling the means to rotate the fuel in the direction to stop the injection of fuel into the engine.

Claims (4)

[Claims] 1. A select position sensor (14) provided on a select lever having at least a drive range and a neutral range of an automatic transmission (13) for detecting switching to the drive range or the neutral range, and the select position. A vehicle provided with a first controller (21) for controlling the automatic transmission (13) based on a detection output of a sensor (14), a vehicle speed sensor (17) for detecting a vehicle speed, and a rotation of an engine (11). A rotation sensor (18) for detecting a speed, either or both of a brake sensor (19) or an accelerator sensor for detecting whether or not a brake pedal or an accelerator pedal is depressed, and the select position sensor (14). Based on each detection output of the vehicle speed sensor (17), the rotation sensor (18), the brake sensor (19) or the accelerator sensor, or both. Serial engine (11) automatic engine stop and restart system for a vehicle, characterized in that a temporary second controller for stopping or restarted (22) a. 2. The select position sensor (14) detects that the select lever is in the neutral range, the vehicle speed sensor (17) detects that the vehicle speed is zero, and the rotation sensor (18) detects the engine (11). When it detects that the rotation speed of is the idle rotation speed, and the brake sensor (19) or the accelerator sensor detects that either the brake pedal is depressed or the accelerator pedal is not depressed, or both. The automatic engine stop and restart system for a vehicle according to claim 1, wherein the second controller (22) is configured to temporarily stop the engine (11). 3. The engine (11) is temporarily stopped, the select position sensor (14) detects that the select lever is in the drive range, and the vehicle speed sensor (17) detects that the vehicle speed is zero. The rotation sensor (18) detects that the rotation speed of the engine (11) is zero, and the brake sensor (19) or accelerator sensor has the brake pedal depressed or the accelerator pedal has not been depressed. When either or both of the above are detected, the second controller (22) electrically holds the automatic transmission (13) in the neutral range even though the select lever is in the drive range. Engine (11)
2. The vehicle according to claim 1, wherein the automatic transmission (13) is released from a hold in an electrical neutral range when the engine (11) is at an idle speed. Automatic engine stop and restart device. 4. A vehicle speed sensor (17) for detecting a vehicle speed, one or both of a brake sensor (19) and an accelerator sensor for detecting whether a brake pedal or an accelerator pedal is depressed, and an engine (11). ) Of the manual transmission (53), a shift position sensor (54) for detecting the shift of the manual transmission (53) to a plurality of gear stages or a neutral position, and whether or not the clutch pedal is depressed. A clutch sensor (60) for detecting whether the vehicle speed sensor (17), the brake sensor (19) or the accelerator sensor, or both, the rotation sensor (18) and the shift position sensor (54). A controller (61) for controlling the engine (11) based on each detection output from the clutch sensor (60)
In an automatic engine stop and restart device for a vehicle equipped with, the engine (11) is temporarily stopped, and the vehicle speed sensor (17) detects that the vehicle speed is zero, the brake The sensor (19) or the accelerator sensor detects one or both of the fact that the brake pedal is stepped on or the accelerator pedal is not stepped on, and the shift position sensor (54) detects the transmission ( 53) is in the neutral position, the clutch sensor (60) in the state of detecting that the clutch pedal is depressed, the shift position sensor (54) is the transmission (53) is the The engine automatic control system for a vehicle, characterized in that the controller (61) is configured to restart the engine (11) when it is detected that one of a plurality of gears is shifted. Stop and restart system.