JPS58117330A - Control method for automatic stoppage and starting of engine - Google Patents

Abstract

PURPOSE:To prevent danger due to the starting of the engine in case of the inspection, etc. of the engine by releasing a function automatically starting or stopping the engine when an engine hood is opened during the automatic stoppage of the engine. CONSTITUTION:An engine hood passing switch ON besides a starter ON..., etc. by a normal ignition switch are made contain into an ERS setting releaser releasing the function automatically stopping or starting the engine. A passing 100 is set up to a part such as a fender 104, and brought to an ON state when the engine hood 102 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine automatic stop/start device H for automatically stopping or starting an engine, and more specifically for canceling the setting of a function for automatically stopping or starting an engine. Concerning a control method.

Generally, when we are driving on a road and encounter road congestion due to an accident with another vehicle or waiting at a traffic light, and are forced to stop for a long time, we stop the engine and then restart it when the congestion clears. conduct.

This is to avoid wasteful fuel consumption due to long periods of idling.

10,000, if you stop at a traffic light at an intersection in the city,
If the engine is stopped (started), the engine must be started each time the vehicle starts, which is not only troublesome but also lacks the speed of starting.

However, the stoppage time tr in city driving occupies a considerable proportion of the total operating time, and the amount of waste emitted during idling operation and the amount of fuel consumed cannot be ignored.

Therefore, when the car is stopped at an intersection etc. while driving in the city, the engine is automatically turned off under certain conditions (+: stop) L,
, 3M has developed an engine automatic stop/start device that automatically starts the engine with the usual start operation (depressing the clutch pedal).

& When Ichikawa descended.

However, opening the engine hood was not included in the above cancellation conditions. For this reason, when inspecting and maintaining a vehicle, when an inspector inspects the engine compartment while the driver inspects the operation of each part of the driver's seat, if the clutch is depressed while the ignition switch is on, the There is a risk that the engine will start and cause harm to the inspector.

Also, at gas stations, while the driver turns on the ignition switch and checks the amount of fuel, etc., a man on the stand inspects the inside of the engine compartment. , there is a risk that the same thing will happen if the driver gets depressed and depresses the clutch.

An object of the present invention is to provide a control method for automatically stopping and starting an engine during automatic engine stopping.

(3) A feature of the present invention is that it captures the detection outputs of various sensors or circuits that detect the operating status of each part of the vehicle, and automatically stops the engine under predetermined conditions based on these detection outputs. In B., the configuration is such that when the engine hood is opened during engine automatic stop F, the setting of the function of automatically stopping or starting the engine is canceled.

Embodiments of the present invention will be specifically described below based on the drawings. FIG. 1 shows the overall configuration of an automatic engine stop/start device for carrying out the present invention, and in the same figure, a control circuit 1 is composed of a microcomputer, etc.
Detection outputs from various sensors are input to the control circuit 1. 10 is a function to automatically stop or start the engine (hereinafter referred to as ER8). ) is the main switch for setting or canceling ER8. When the main switch 10 is pressed after starting the engine by normal operation, ER8 is set. Further, after setting ER8, if the main switch 10 is pressed again, EftS is canceled. The ER8 setting will be automatically canceled under other predetermined conditions4), but this will be explained later.

Furthermore, t, 712 is a heavy speed sensor, and this vehicle speed sensor 12 detects whether the vehicle is in a running state or a stopped state, and the detection output of this sensor 12 is used to automatically stop the engine. Used for determining F. 14 is an ignition circuit, and the control circuit 1 processes the 0-fire pulse signal output from the ignition circuit 14 as an engine rotation speed signal. This engine speed signal is determined by the settings of F and R8, as described below.
It is used to determine the conditions for automatic engine stop 1-1 automatic start, and E) LS setting cancellation. 16 is a clutch pedal, and 18A and 18B are a clutch upper switch and a clutch lower switch that are turned on and off in conjunction with the clutch pedal 16, respectively. Each of these switches detects the amount of depression of the clutch pedal 16, and the clutch upper switch 18A detects the amount of depression of the clutch pedal 16.
When the engine 6 is depressed to a full stroke (for example, 30%) or more, it is turned on (Jr l), a signal is sent to the control circuit 1, and the control circuit 1 controls the engine so as not to stop. Further, the clutch lure switch 18B is turned on when the clutch pedal 16 is fully depressed, and sends a signal thereof (a signal for permitting automatic engine start) to the control circuit 1.

The engine 20 is also provided with a water temperature sensor 22 that detects the engine cooling water temperature, and an oil pressure switch 24 that detects the oil field of the engine oil, and these detection outputs are input to the control circuit 1. 26 is a changeover switch for displaying the power generation state of the alternator, and the switch 26 is turned on when the alternator is generating power. 28 is a battery voltage sensor that detects the battery voltage, and 30 is a magnet switch that controls the operation of the near conditioner, which is turned on when the air conditioner is operated.

Further, 32 is a headlamp switch that switches the headlamp on or off, and 34 is a wiper switch that detects the operating state of the wiper.
．． 34 is a) for detecting whether or not the electrical load is in a high state. Further, 36 is a turn signal switch that detects the right turn state of the vehicle, and 38 is a door switch that detects the open/close state of the driver's side door. Of these detection outputs, the former is the engine automatic stop condition, and the latter is the ER8's automatic stop condition. Used as input for determining setting conditions and setting cancellation conditions.

Furthermore, 50 is a slope sensor that detects whether or not the gradient of the slope on which the vehicle is stopped is at least a predetermined value (for example, 2 degrees), and turns ON when the slope is at least the predetermined value; and 52 is a slope sensor that detects whether the engine is in an idle state. An idle switch 54 is a defogger switch that detects whether or not a defogger is being used (turned ON in an idle state). Further, 100 is a passive switch that detects the open state of the engine hood, and the switch 100 is turned on when the engine hood is opened.

Now, the predetermined conditions are met, and ER8 is switched to main switch 10.
After the settings are made, automatic stopping and automatic starting of the engine 20 is performed as follows. That is, when the stop condition for the engine 20 is satisfied, the engine stop signal 44 is output from the control circuit 1 to the fuel cut relay 40, and as a result, the fuel cut relay 40 outputs the fuel cut solenoid (not shown) of the fuel supply system in the engine 20. When the fuel cut signal 50 is activated,
Further, an ignition cut signal 60 is output to the ignition circuit 14, and the engine is stopped. However, in order to achieve the engine automatic stop function, it may be configured to only cut the ignition without cutting the fuel, but in this case, the engine runs on, which may affect the driving feeling. There are drawbacks that worsen.

On the other hand, when ER8 is in the setting state and the clutch pedal 16 is fully depressed while the engine is stopped, the clutch lower switch 18B is turned on, and when other conditions are met (described later), the control circuit 1 starter relay 41 An engine start signal 46 is output to the starter 4, and as a result, the starter 4
2 is energized and the engine 20 is started. Further, starter relay 41 is supplied with power from battery VB via ignition switch 80.

Next, BR8 of the engine automatic stop/start device shown in Figure 1.
Each operation mode of setting, engine stop after ER8 setting, and engine start will be explained based on FIGS. 2 to 4. FIG. 2 shows an operating mode for setting ER8, and as shown in the figure, setting of ER8 becomes possible when the following five conditions are ANDed.

(11B RS setting must be canceled.

(2) The main switch for E RS setting is in the on state.

(3) The engine is rotating (for example, the engine speed is 40
0±50 Orpm).

(4) The alternator is generating power.

(5) The driver's side door is closed (detected by the door switch).

Here, the cancellation of the ER8 setting (1) may be performed manually or automatically by suppressing the main switch, but this will be described later.

Also, to detect whether the engine is rotating or not (3
This is determined based on the engine rotation speed of ) and the power generation state of the alternator (4).This is to accurately detect whether the engine is in a rotating state.

Next, FIG. 3 shows the operation mode of automatic engine stop by ER8. As shown in the figure, when the following conditions (1) to (13) are ANDed, the engine is automatically stopped.

(1) E RS must be set.

(2) When the engine speed is at a predetermined speed (e.g. 850r)
pm) or less.

(3) Both the upper and lower clutch switches 18A and 18B are in the OFF state, that is, the clutch pedal 16 is not depressed.

(4) The turn signal switch 36 is in the OFF state, that is, no right turn signal is output.

6) The headlamp switch 32 is in the 0FF9 state.

(6) The wiper switch 34 is in the OFF state.

(7) The 71 sensor 22 is in the OFF state, that is, the engine cooling water temperature is within a specific temperature range (for example, 75°C to 105°C).

(8) The air conditioner magnet switch 3o is in the OFF state.

(9) A predetermined period of time (for example, 4 seconds) has elapsed since the engine was started by E RS.

(10) The vehicle is in a stopped state.

(11) The slope sensor 50 is in the OFF state.

(12) The idle switch 52 is in the OFF state.

(13) The defogger switch 54 is in the OFF state.

That's all for 1. Among the above conditions, (2) requires the engine speed to be 85 Orpm or less to take into account engine stoppage due to engine stalling, and (4) requires a right turn in the vehicle. This is because the driver sometimes needs to pay attention to checking the presence or absence of an oncoming vehicle, and it is not desirable to stop the engine under such conditions. History conditions (5), (6), (8)
, (13) is used to determine whether to stop the engine in order to prevent the battery from being over-discharged due to stopping the engine while the electrical load is high.

Condition (7) is such that the engine is difficult to start when the engine cooling water temperature is low or high, so the engine is not stopped in these temperature ranges.

Regarding condition (9), automatic engine stop is E Ft.
This is because it is performed for the first time after the engine is started by S.

In addition, the condition (1) ``The vehicle is in the stopped F state - 1
is determined based on the presence or absence of a level change in the detection output (pulse train signal) of the vehicle speed sensor 12. Condition (3) was provided because the clutch pedal may be depressed at times other than when starting the engine or changing gears, and this device is configured to start the engine by depressing the clutch pedal. Because there is.

As explained above, the engine rotational speed signal and the clutch signal interlocked with the clutch pedal are used as criteria for automatically stopping the engine.

Next, FIG. 4 shows an operation mode for automatically starting the engine using the ER8. As shown in the figure, the engine is automatically started when the following conditions (1) to (4) are ANDed.

(1) ER8 must be set.

(2) If the engine rotation speed is the set rotation speed (for example, 50 rpm)
) or less.

(3) The alternator is in a state where power generation is stopped.

(4) The clutch lower switch is in the ON state, that is, the clutch pedal is fully depressed.

Of the above conditions (2) and (3), the engine stops F
, the engine rotation speed signal and the alternator power generation status signal are both used for this determination. This is to ensure that the determination can be made even if it is not.

Next, an embodiment of the control method for automatically stopping and starting the engine according to the present invention will be described with reference to FIGS. 5 to 7. FIG. 5 shows an operation mode Ft for canceling the setting of E1'(S).

After ER8 is set, it can be canceled manually or automatically under certain conditions.

A) When manually canceling: After operating the main switch 10el and 11-, press the button again to cancel the ER8 setting.

B) When automatically released (1) When the ignition switch is manually operated and the engine is restarted.

(2) When the driver's side door is opened.

(3) When the battery voltage drops.

(4) When restarting, it takes a certain amount of time (for example, 2 seconds) for the engine speed to reach a certain rotation speed (for example, 550 rpm) or higher.
When it took more than

Among the above conditions, (1) is because the driver may forget that the engine has automatically stopped due to ER8 and restart it with the key switch out of habit, and (2) is due to the fact that the ER8 This is to avoid confusion for people who are unfamiliar with it. In addition, (3) and (4) are difficult to restart if ER8p is activated when the battery capacity is low.
8 is canceled, but in addition to the above rJ, the present invention further sets (5
) The ER8 setting is automatically canceled even if the engine hood is fully opened. That is, this prevents the engine from starting automatically if the clutch is carelessly operated during engine inspection or the like.

This is based on the idea that when opening Engine Two F and trying to start the engine, the ignition switch should be used to start the engine based on the driver's clear intention.

Next, an embodiment of a means for detecting the open state of the engine hood and canceling the setting of ER8 is shown in FIGS. 6 and 7.

FIG. 6 shows an embodiment in which a passive switch 100 that is turned on when the engine hood 102 is opened is provided in the fender section 104.

FIG. 7 also shows a lever 1 connected to the engine hood via a wire 106 to open the engine hood.
08 is shown.

The detection output of the passive switch 100 used in the above two embodiments is used as a judgment manual for canceling the setting of ER8 as explained in FIG. It becomes OFF state when it is in the state of
It operates in such a way that it becomes the state.

Note that the means for detecting the open state of the engine hood is not limited to the passive switch, and may be replaced with other switch means.

As explained below (as described in Section 7), in the present invention, the detection outputs of various sensors or circuits that detect the operating state of each part of the vehicle are taken in, and the engine is automatically stopped under predetermined conditions based on these detection outputs. According to the present invention, since the engine is configured to cancel the setting of the function that automatically stops or starts the engine when the engine hood is opened inside the vehicle, the engine may unexpectedly start during engine inspection or the like while the engine is automatically stopped. You can avoid danger.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic engine stop + h start device for carrying out the present invention, FIGS. 2 to 5 show operating modes in the control circuit 1, and FIG.
Figure 3 shows the operating mode when the engine is automatically stopped, Figure 4 shows the operating mode when the engine is automatically started, and Figure 5 shows the operating mode when the ER8 setting is canceled. FIG. 6 is an explanatory diagram showing one embodiment of the means for detecting the open state of the engine hood, and FIG. 7 is an explanatory diagram showing another embodiment of the means for detecting the open state of the engine hood. It is an explanatory diagram. ]... Control circuit, 10... Main switch, 12.
...Vehicle speed sensor, 14...Ignition circuit, 18A...Clutch upper switch, 18B...Clutch lower switch, 42...Starter, 80...Ignition switch, 100...Passive switch, 102... °゛Engine foot 104...fender, 108...lever. (17)

Claims (1)

[Claims] (1) Automatic engine stop, which takes in the detection outputs of various sensors or circuits that detect the operating status of each part of the vehicle, and automatically stops or starts the engine under predetermined conditions based on these detection outputs. 1. A control method for automatically stopping and starting an engine, characterized in that the setting of a function for automatically stopping or starting the engine is canceled when the engine hood is opened inside the engine.