JPH07293292A - Automatic start/stop device for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce the electric power consumption during the automatic stop, lighten the load for a battery and permit the automatic stop for a long time, by cutting off the supply of electric power to a central processing part after the control for the automatic stop of an internal combustion engine, when the automatic stop condition for the perfect returning operation of a clutch pedal is established. CONSTITUTION:During the operation of an internal combustion engine 2, if the automatic stop condition other than the perfect returning operation of a clutch pedal 12 is established, and then the automatic stop condition of the perfect returning operation of the clutch pedal 12 is established, control is performed so as to permit the automatic stop of the internal combustion engine 2, and the supply of electric power to a central processing part 40 of a control means 36 is cut off. Further, during the automatic stop of the internal combustion engine 2, if the prescribed automatic start condition is established after the start of the supply of electricity to the central processing part 40 by the prescribed operation of the clutch pedal 12, control is performed so that the automatic start of the internal combustion engine 2 is carried out. Accordingly, the electric power consumption during the automatic stop of the internal combustion engine 2 is lightened, and the load for a battery is lightened, and the automatic stop for a long time is permitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic start / stop system for an internal combustion engine, and more particularly to reducing the power consumption during the automatic stop of the internal combustion engine by the automatic start / stop system and the load on the battery. The present invention relates to an automatic start / stop device for an internal combustion engine that can enable automatic stop for a long time.

[0002]

2. Description of the Related Art Some internal combustion engines mounted on vehicles are provided with an automatic start / stop device for automatically starting and stopping under a predetermined condition in order to reduce fuel consumption.

Examples of conventional automatic start / stop devices for internal combustion engines include, for example, Japanese Utility Model Publication No. 53-19317 and Japanese Utility Model Publication No.
There is one disclosed in Japanese Unexamined Patent Publication No. 8-169135.

The automatic starting / stopping device disclosed in Japanese Utility Model Publication No. 53-19317 is provided with a first clutch switch for generating a first detection signal when the clutch pedal is depressed, and when the depression of the clutch pedal is completed. Second
A second clutch switch for generating a detection signal of
The internal combustion engine is automatically started by the generation of the first and second detection signals at the start of the vehicle start, and the first internal combustion engine is stopped when the vehicle is stopped.
Control means for automatically stopping the internal combustion engine when the second detection signal disappears is provided to maintain the operation of the internal combustion engine when the operation maintaining condition of the internal combustion engine is satisfied, and to control the control means when the operation maintaining condition disappears. The condition detecting means for performing the operation is provided.

The automatic start-stop system disclosed in Japanese Utility Model Laid-Open No. Sho 58-169135 prohibits automatic stop in a period in which the amount of battery charge is equal to or less than the amount of battery discharge at the time of start after the automatic start of the internal combustion engine.

[0006]

By the way, the automatic start-stop system for an internal combustion engine controls the internal combustion engine to automatically stop when other automatic stop conditions including a complete return operation of the clutch pedal are satisfied. When an automatic starting condition including a complete depression operation of the clutch pedal is satisfied during the automatic stop of the internal combustion engine, there is a control for automatically starting the internal combustion engine.

In such a conventional automatic start-stop system, the control means controls the automatic stop / start-start of the internal combustion engine. Therefore, the automatic start-stop device
Even during the automatic stop of the internal combustion engine, it is necessary to supply power to the computer forming the control means.

However, when the automatic stop of the internal combustion engine is continued for a long time, the voltage of the battery is lowered due to the power consumption by the computer constituting the control means.
It may be difficult to start.

Therefore, the conventional automatic start-stop device controls the automatic start of the internal combustion engine when the automatic stop continues for a predetermined time, and controls the automatic start when the voltage of the battery drops. There is.

However, due to the performance of the battery, the automatic start / stop device cannot extend the time during which it can be automatically stopped, which is disadvantageous in that it is limited to a short time.

Further, some computers constituting the control means can switch to a low power consumption mode in order to reduce power consumption. The low power consumption mode is "SLEE
The power supply to the central processing unit (CPU) is cut off by a command such as "P", the power supply to the clock and the peripheral devices of the central processing unit is secured, and the data of the register, RAM and I / O port is saved The power supply to the central processing unit is started by the cancellation command, and the operating power of the central processing unit can be reduced.

However, the automatic start-stop system must be in a state in which the central processing unit of the computer constituting the control means is operating when determining the automatic start condition during the automatic stop of the internal combustion engine.

Therefore, in the conventional automatic start-stop system, when the low power consumption mode can be switched during the automatic stop in order to reduce the power consumption by the computer constituting the control means, the internal combustion engine is automatically stopped. It is necessary to cancel the low power consumption mode and return to the normal mode before determining the automatic start condition.

However, in the conventional automatic start-stop system, it is difficult to cancel the low power consumption mode and return to the normal mode before determining the automatic start condition during the automatic stop of the internal combustion engine. There is an inconvenience that cannot be applied to.

[0015]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention establishes an automatic stop condition other than the complete return operation of the clutch pedal while the internal combustion engine mounted on the vehicle is operating. When the automatic stop condition of the complete return operation of the clutch pedal is satisfied, the internal processing engine is controlled to automatically stop and then the power supply to the central processing unit is cut off and the clutch is provided after the internal combustion engine is automatically stopped. When the automatic starting condition other than the complete depression operation of the clutch pedal is satisfied after the power supply to the central processing unit is started by the slight depression operation of the pedal, and then the automatic passage condition of the complete depression operation of the clutch pedal is established. Is provided with control means for controlling the internal combustion engine to be automatically started.

[0016]

According to the structure of the present invention, in the automatic start / stop system, the automatic stop condition other than the complete return operation of the clutch pedal is established during the operation of the internal combustion engine, and then the automatic stop condition of the complete return operation of the clutch pedal is established. If the condition is satisfied, the power supply to the central processing unit is cut off after controlling the internal combustion engine to automatically stop, and the central processing unit is powered by a slight depression operation of the clutch pedal during the automatic stop of the internal combustion engine. When the automatic start condition other than the full depression operation of the clutch pedal is satisfied after the supply of the fuel is started and the automatic start condition of the full depression operation of the clutch pedal is satisfied next, the control means for controlling the internal combustion engine to be automatically started is provided. As a result, during the automatic stop of the internal combustion engine, it is possible to reduce the power consumption by cutting off the power supply to the central processing unit of the control means. In determining the automatic start condition during automatic stop of the combustion engine can be operated state a central processing unit of the control means.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIG. 4, 2 is an internal combustion engine mounted on a vehicle (not shown), 4 is a clutch, and 6 is a transmission. The internal combustion engine 2 has a fuel injection valve 8 and a starter motor 10. The clutch 4 is disengaged and connected by depressing and returning the clutch pedal 12. The transmission 6
The meshing state can be switched by a shift lever (not shown).

The internal combustion engine 2 is provided with a fuel injection control unit 14 for controlling the fuel injection valve 8, a vehicle speed sensor 16 for detecting a vehicle speed, a rotation speed sensor 18 for detecting an engine speed, and cooling. A water temperature sensor 20 for detecting the water temperature is provided, an electric load 22 is provided, an alternator 24 is provided,
An idle switch 26 is provided for detecting that the throttle valve (not shown) is in an idle opening state, and a brake switch 28 is provided for detecting a depression operation state of a brake pedal (not shown).

As shown in FIG. 3, the clutch pedal 12 is provided with a clutch upper switch 30 which is turned on at the time of complete return operation and turned off at the time of complete depression operation, and is turned on at the time of complete depression operation and turned off at the time of complete return operation. A lower switch 32 is provided.

The vehicle speed sensor 16 including the fuel injection control unit 14 to the clutch lower switch 32 are connected to the control means 36 of the automatic start / stop device 34 via a waveform shaping circuit 38. The control means 36 has a central processing unit 40 that calculates and processes instructions. A fuel injection valve stop relay 44, a starter drive relay 46, and an abnormality display lamp 48 are connected to the control means 36 via a waveform shaping circuit 42.

The fuel injection valve stop relay 44 stops driving the fuel injection valve 8 to cut off the fuel. The starter drive relay 46 turns on and drives the starter motor 10. The abnormality display lamp 48 is turned on or blinks to give an alarm when an abnormality is detected.

The automatic start / stop device 34 includes a control means 3
A central processing unit 40 of 6 controls automatic start / stop of the internal combustion engine 2. The control means 36 is automatically operated by a signal input from the vehicle speed sensor 16 including the fuel injection control unit 14 to the clutch lower switch 32 while the internal combustion engine 2 mounted on the vehicle is in operation, except for the complete return operation of the clutch pedal 12. The stop condition is met, then clutch pedal 1
If the automatic stop condition of the complete return operation of No. 2 is satisfied, the internal processing engine 2 is controlled to automatically stop, and then the central processing unit 4
The power supply to 0 is cut off.

Further, the control means 36 includes the vehicle speed sensor 16 including the fuel injection control section 14 to the clutch lower switch 3.
A signal input from 2 starts supplying power to the central processing unit 40 by slightly depressing the clutch pedal 12 while the internal combustion engine 2 is automatically stopped, and then an automatic start condition other than a complete depressing operation of the clutch pedal 12 is started. Is satisfied, and then the automatic start condition for the complete depression operation of the clutch pedal 12 is satisfied, the internal combustion engine 2 is controlled to be automatically started.

Next, the operation will be described with reference to FIGS.

The control means 36 of the automatic start / stop device 34 is
Control starts during operation of the internal combustion engine 2 (step 10
Then, it is determined whether or not the automatic stop condition other than the complete return operation of the clutch pedal 12 is satisfied (step 1).
02). The automatic stop conditions other than the complete return operation of the clutch pedal 12 include vehicle speed and throttle opening.

If the determination in step 102 is NO, the process returns. As shown in FIG. 2, when an automatic stop condition other than the complete return operation of the clutch pedal 12 is established, step 102
If the determination is YES, it is determined whether or not the clutch upper switch 30 is ON by the complete return operation of the clutch pedal 12 (step 104).

If the determination in step 104 is NO, the process returns to step 102. If the determination in step 104 is YES, the automatic stop condition for the complete return operation of the clutch pedal 12 is satisfied, so the fuel injection valve stop relay 4
6, the drive of the fuel injection valve 8 is stopped to cut off the fuel, and the internal combustion engine 2 is automatically stopped (step 106).

After the automatic stop process of the internal combustion engine 2 (step 106), the control means 36 shifts to the low power consumption mode by executing a command such as "SLEEP" as shown in FIG. 2 (step 108). The power supply to the central processing unit 40 is cut off.

As a result, the control means 36 controls the internal combustion engine 2
The power consumption can be reduced by cutting off the power supply to the central processing unit 40 during the automatic stop of
A clock other than the central processing unit 40 and power supply to peripheral devices of the central processing unit 40 can be secured, and registers, RAM,
Data such as I / O ports can be saved.

While the internal combustion engine 2 is automatically stopped, it is determined whether or not the clutch upper switch 30 is off by a slight depression operation of the clutch pedal 12 (step 110).

If the determination in step 110 is NO, the process returns. If the determination in step 110 is yes,
As shown in FIG. 2, the low power consumption mode is released by inputting an OFF signal of the clutch upper switch 30 by a slight depression operation of the clutch pedal 12 to the low power consumption mode releasing terminal 50 of the control means 36 (step 112). ), The supply of power to the central processing unit 40 is started.

The control means 36 determines whether or not an automatic starting condition other than the complete depression operation of the clutch pedal 12 is satisfied after the supply of power to the central processing unit 40 is started (step 114). The automatic starting condition other than the complete depression operation of the clutch pedal 12 includes an ignition signal (ignition pulse) of the internal combustion engine 2 and a throttle opening degree.

If step 114 is NO, the process returns. When step 114 is YES, it is determined whether or not the clutch lower switch 32 is ON by the complete depression operation of the clutch pedal 12 (step 11).
6).

When step 116 is NO, the process returns to step 114. If step 116 is YES, the automatic start condition for the complete depression operation of the clutch pedal 12 is satisfied, and therefore the fuel injection control unit 14 drives the fuel injection valve 8 to start the fuel injection, and the starter drive relay is also activated. The internal combustion engine 2 is automatically started by turning on and driving the starter motor by 46 (step 11
8) and returns (step 120).

As described above, in the automatic start / stop system 34, the automatic stop conditions other than the complete return operation of the clutch pedal 12 are satisfied while the internal combustion engine 2 is operating, and then the automatic stop condition of the complete return operation of the clutch pedal 12 is established. If holds,
After controlling the internal combustion engine 2 to automatically stop, the control means 3
The power supply to the central processing unit 40 of 6 is cut off. Further, the automatic start / stop device 34 starts the supply of power to the central processing unit 40 by a slight depression operation of the clutch pedal 12 while the internal combustion engine 2 is automatically stopped, and then automatically starts other than the complete depression operation of the clutch pedal 12. If the condition is satisfied and then the automatic start condition for the complete depression operation of the clutch pedal 12 is satisfied, the internal combustion engine 2 is controlled to be automatically started.

As a result, the automatic start-stop system 34 has the central processing unit 40 of the control means 36 while the internal combustion engine 2 is automatically stopped.
It is possible to reduce the power consumption by shutting off the power supply to the central processing unit 40 of the control means 36 when determining the automatic start condition during the automatic stop of the internal combustion engine 2. be able to.

Therefore, the automatic start / stop device 34 is
The power consumption during the automatic stop of the internal combustion engine 2 can be reduced, the load on the battery can be reduced, and the automatic stop for a long time can be enabled. Further, when the automatic start-stop device 34 determines the automatic start condition during the automatic stop of the internal combustion engine 2, the central processing unit 40 of the control means 36 is supplied with power and is in an operating state, so The automatic start / stop function of the engine 2 is not impaired.

[0038]

As described above, according to the present invention, the automatic start-stop system can reduce the power consumption by shutting off the power supply to the central processing unit of the control means during the automatic stop of the internal combustion engine. In addition, the central processing unit of the control means can be activated when determining the automatic start condition during the automatic stop of the internal combustion engine.

Therefore, the automatic start-stop system can reduce the power consumption during the automatic stop of the internal combustion engine, reduce the load on the battery, and enable the automatic stop for a long time. Further, the automatic start-stop device is configured to automatically start the internal combustion engine by determining whether the automatic start condition during the automatic stop of the internal combustion engine is determined by supplying power to the central processing unit of the control unit and keeping the operating state. It does not impair the stop function.

[Brief description of drawings]

FIG. 1 is a flowchart of control showing an embodiment of an automatic start-stop system for an internal combustion engine.

FIG. 2 is a timing chart of control of an automatic start-stop system for an internal combustion engine.

FIG. 3 is a schematic configuration diagram illustrating operations of a clutch upper switch and a clutch lower switch.

FIG. 4 is a system configuration diagram of an automatic start-stop system for an internal combustion engine.

[Explanation of symbols]

 2 Internal combustion engine 4 Clutch 6 Transmission 8 Fuel injection valve 10 Starter motor 12 Clutch pedal 30 Clutch upper switch 32 Clutch lower switch 34 Automatic start / stop device 36 Control means 40 Central processing unit

[Procedure amendment]

[Submission date] July 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

In such a conventional automatic start / stop system, the control means controls the automatic stop / automatic start of the internal combustion engine. Therefore, the automatic start-stop device
Even during the automatic stop of the internal combustion engine, it is necessary to supply power to the computer forming the control means.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention establishes an automatic stop condition other than the complete return operation of the clutch pedal while the internal combustion engine mounted on the vehicle is operating. When the automatic stop condition of the complete return operation of the clutch pedal is satisfied, the internal processing engine is controlled to automatically stop and then the power supply to the central processing unit is cut off and the clutch is provided after the internal combustion engine is automatically stopped. When the automatic start condition other than the complete depression operation of the clutch pedal is satisfied after the power supply to the central processing unit is started by the slight depression operation of the pedal, and then the automatic start condition of the complete depression operation of the clutch pedal is established. Is provided with control means for controlling the internal combustion engine to be automatically started.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

As shown in FIG. 3, the clutch pedal 12 is provided with a clutch upper switch 30 which is turned on at the time of a complete return operation and turned off at the time of a small allowance depression operation. A lower switch 32 is provided.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

If the determination in step 104 is NO, the process returns to step 102. If the determination in step 104 is YES, the automatic stop condition for the complete return operation of the clutch pedal 12 is satisfied, so the fuel injection valve stop relay 4
4, the drive of the fuel injection valve 8 is stopped to cut off the fuel, and the internal combustion engine 2 is automatically stopped (step 106).

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure correction 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

Claims (1)

[Claims] 1. The internal combustion engine when an automatic stop condition other than a complete return operation of the clutch pedal is satisfied during operation of an internal combustion engine mounted on a vehicle, and then an automatic stop condition for the complete return operation of the clutch pedal is satisfied. The power supply to the central processing unit is cut off after the control is performed so as to automatically stop, and the power supply to the central processing unit is started by a slight depression operation of the clutch pedal during the automatic stop of the internal combustion engine. A control means is provided for automatically starting the internal combustion engine when an automatic starting condition other than the full depression operation of the clutch pedal is established, and then an automatic starting condition of the full depression operation of the clutch pedal is established. An automatic start-stop device for an internal combustion engine, characterized by: