JPS5828565A - Method for controlling automatic stoppage and starting of engine - Google Patents

Abstract

PURPOSE:To reduce the frequency of driving of a starter, by prohibiting the automatic stoppage of an engine for a prescribed time after the engine is started under an automatic engine stop/start function set. CONSTITUTION:After an engine 20 is automatically stopped at the time of the constitution of a prescribed condition, a starter 42 is driven through a control circuit 1 to automatically start the engine again when an automatic engine stop/ start switch 10 is turned on, the rotational frequency of the engine based on the output of an ignition circuit 14 is lower than a set level, an alternator is generating no electricity, a changeover switch 26 is turned off and a clutch pedal 16 is fully depressed and a lower limit switch 18B is turned on. Subsequently, the control circuit 1 prohibits the automatic stoppage of the restarted engine, under an automatic engine stop/start function. In other words, a timer is started at the time of the restarting of the engine to prohibit its automatic stoppage for the set time of the timer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for automatically stopping and starting an engine to automatically stop or start an engine.

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.

On the other hand, if the engine is stopped after stopping at a traffic light at an intersection in a city, the engine must be restarted each time the vehicle starts, which is not only troublesome but also lacks the speed of starting.

However, the stop time in city driving accounts for a small proportion of the total driving time, and the amount of fuel consumed during exhaust gas emitted during idling cannot be ignored.

Therefore, recently, when driving in the city, the engine is automatically stopped under certain conditions, such as when the car stops at an intersection at 9 o'clock, and the engine is automatically started with a normal oversight operation (depressing the clutch pedal). An automatic engine stop/start device has been developed.

In a conventional engine automatic stop/start device, after setting the engine automatic stop/start function, the engine is automatically stopped or started when a predetermined condition is met.

However, under vehicle operating conditions such as when the engine is stopped immediately after starting and then restarted, such as during road congestion, the starter does not start frequently, leading to over-discharge of the battery and preventing the engine from restarting. This can be difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a control method for automatically stopping and starting an engine, which reduces the frequency of starting the starter and prevents deterioration of battery function.

In systems that automatically stop or start the engine under predetermined conditions based on output output, after setting the engine automatic stop/start function, the engine is started based on the function, and then the engine automatically stops for a predetermined period of time. The main point is that it is configured to prohibit.

Embodiments of the present invention will be specifically described below based on the drawings. FIG. 1 shows an engine to which the present invention is applied.

The overall structure of the engine automatic stop/start device is shown. In the figure, 1 is a control circuit, which is composed of a microcombiner and the like. Detection outputs from various sensors are input to the control circuit 1. 10 is a round main switch that sets or cancels the function of automatically stopping or starting the engine (hereinafter referred to as FIR8).When the main switch 10 is pressed after starting the engine during normal operation, BH8 is activated. is set. When the main switch 10 is pressed again after setting ER8, BH3 is canceled. The setting of BH8 is automatically canceled under other predetermined conditions, which will be described later.

Furthermore, 12 is a vehicle speed sensor, and this vehicle speed sensor 12 detects whether the vehicle is in a running state or in a stopped state, and the detection output of this sensor 12 is used to determine whether the engine automatically stops. used. 14 is an ignition circuit], and the ignition pulse signal output from the ignition circuit 14 is transmitted to the control circuit 1.
is processed as an engine speed signal. This engine speed signal is used to determine the conditions of BH3 setting, automatic engine stop, automatic start, and BH8 setting cancellation, as will be described later. 16 is a clutch pedal;
Reference numeral 8B indicates a clutch upper switch and a Tatsuta A7 switch which are turned on and off in conjunction with the clutch pedal 16, respectively. All of these switches detect the amount of engagement of the clutch pedal 16, and the clutch upper switch 18 is turned on when the clutch pedal 16 is depressed by a certain percentage of the full stroke (for example, 30X or more). , sends a signal to the control circuit 1, and sends a signal to the control circuit 1.
control so that the engine does not stop. Further, when the clutch pedal 16 is fully depressed, the clutch four-a switch 18B is turned on and a signal thereof (a signal that allows automatic engine starting) is sent to the control circuit IK.

Also, is the engine 2011C a water temperature sensor that detects the engine cooling water temperature? 22. An oil pressure switch 24 is provided to detect the oil pressure of the engine oil, and these detection outputs are input to the control circuit l. This is a changeover switch for charging the battery with the output of the 26-volt alternator, and the switch 26 is turned on when the alternator is generating power. 28 is a battery voltage input, and 30 is a magnet switch for controlling the operation of the air conditioner, which is turned on when the air conditioner is operated.

Furthermore, 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. These switches 30.32
．． This detects whether or not the 34Fi electrical load is suddenly decreasing. Also, 36 is a turn signal switch that detects the right turn state of the vehicle, and 38 is a door switch that detects the opening/closing state of the door on the driver's seat side. Of these detection outputs, the former is the engine automatic stop condition, and the latter is the ER & 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 detects whether the defogger is being used (turned ON in the idle state), and a defogger switch 54 detects whether the defogger is being used.

Now, the predetermined conditions are met, and the ERA is set to the main switch 10.
After the settings are made, automatic stopping and automatic starting of the engine 20 is performed as follows. When the conditions for stopping the engine 20 are met, the control circuit 1 outputs a carrot stop signal (4-level) 44 to the fuel-rich cut relay 40, and as a result, the fuel cut relay 40 stops the fuel supply system in the engine 20. A fuel cut signal 50 is applied to a fuel cut solenoid (not shown) and an ignition cut signal 60 is applied to the ignition circuit 14.
is output and the engine stops. However, in order to achieve the automatic engine stop function, it may be configured such that only the ignition cut is performed when the fuel is cut, but in this case, the driving feeling may be affected because the engine runs on. There are drawbacks that worsen.

On the other hand, when the 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.When other conditions are satisfied (described later), the control circuit 1 An engine start signal 46 is output to the sister relay 41, and as a result, a starter signal 70 is output to the starter 42 and the engine 20 is started.

Next, lR8 of the engine automatic stop/start cover shown in Figure 1.
Each operation mode of setting, engine stop after FiR8 setting, and engine start will be explained based on FIGS. 2 to 4. FIG. 2 shows an operation mode for setting lR8, and as shown in the figure, setting of lR8 becomes possible when the AND of the following five conditions is satisfied.

<1) The setting of lR8 must be canceled.

(2) 'The main switch for setting IAR8 is in the on state.

(3) The engine is rotating (for example, the engine rotation speed is 400±s o rpm or more).

(4) The alternator is generating power.

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

Here, (1) OBR8lR8 setting may be performed manually by suppressing the main switch or automatically; this will be described later.

K (
3) (D) The determination is made based on the engine rotational speed and the power generation state of the alternator in (4). This is to accurately detect whether the engine is in a rotating state or not.

Next, FIG. 3 shows an operation mode for automatically stopping the engine by lR8. As shown in FIG. 3, when the following conditions (1) to Nishiki are ANDed, the engine is automatically stopped.

(1) lR8 must be set.

(2) The carrot rotation speed is a predetermined rotation speed (for example, 85
0 rpm) or less.

(3) Clutch upper, lower switch 18 people, 18
B are both in the OFF state, that is, the clutch pedal 16 is not depressed.

(4) The turn signal switch 36 is in the OFF state,
In other words, the right turn signal is not output.

(5) The head 2/gas switch 32 is in the OFF state.

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

(7) The water temperature 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 1 osc)
What's in it.

(8) The air conditioner magnet switch 30 is in the OFF state] with Hitoshi at 11.

(9) A predetermined period of time (for example, 4 seconds) has elapsed after the engine was started by lR8.

舖 The vehicle is in a stopped state.

(2) The slave sensor 50 is in the OFF state.

The wheel idle switch 52 is in the OFF state.

I The defogger switch 54 is in the OFF state.

The above is the above, but among the conditions (2) above, the condition that the engine rotation speed is 85 Orpm or less is to take into account engine stoppage due to stalling, and (4) is also used as a judgment condition. This is because when the vehicle turns right, the driver must pay attention to checking for oncoming vehicles, etc., and it is not desirable to stop the engine in such a situation. Furthermore, conditions (5), +6), and (8)% are used to determine whether the engine should be stopped in order to avoid over-discharge of the battery 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.

This is because condition (9) is satisfied because the automatic engine stop is performed only after the engine is started by lR8.

Further, the condition α. that “the vehicle is in a stopped state” is determined based on the presence or absence of a change in the level of the detection output (pulse train signal) of the vehicle speed sensor 12. Condition (3) was established because the clutch pedal cannot be depressed except when starting the engine or changing gears, and in this device, the engine cannot be started by depressing the clutch pedal. This is because it is configured as follows.

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 code for automatically starting the engine by ICtR8. As shown in the figure, the engine is automatically started when the following conditions (1) to (4) are ANDed.

(1) lR8 must be set.

(2) If the engine rotation speed is the set rotation speed (e.g. 50r)
pm) 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) are for determining whether the engine is in a stopped state, but both the carrot rotation speed signal and the alternator power generation state signal are used for this determination. This is to enable reliable determination even when one of the signals is not input to the control circuit l.

On the other hand, to cancel this after setting lR8, proceed as follows.A) To manually cancel the setting, press the main switch lO once, then press it again after performing the suppression operation.) The setting of lR8 will be canceled. .

B) When it is automatically released (1) When the engine is restarted by manually operating the exit switch.

Wow) When opening the driver's side door.

(8) When the battery voltage drops.

(4) When restarting, it takes a certain amount of time (for example, 2
seconds) or more.

In the above case, the setting of lR8 is automatically canceled.

Among the above conditions, (1) is due to the fact that the engine automatically stops due to lR8, and the driver may forget the 9th turn and restart it with the current switch out of habit, and (2) is due to the driver's This is to take replacement into account and to avoid confusion among people who are unfamiliar with ICR8. t (3), +4) (If you operate lR8 with reduced power/capacity, it will be difficult to restart it, so use FIR8 only that time) Start it, and set lR8 at the same time as starting. I am trying to remove it.

Next, FIG. 5 shows the relationship between the starter signal and the automatic engine stop prohibition signal. When the nine engine starting conditions described above are satisfied and the clutch pedal is depressed, an engine starting signal 46 is output to the starter relay 41, and as a result, a starter signal 70 ((B) in the same figure) is sent to the starter 42.

This starter signal 70 is the engine rotational speed force; the set rotational speed R at which it is determined that the engine has started (see figure (m))
At the running point (time T,), the engine stops automatically (), and the control circuit 1 starts to turn off the high fuel level). The time is output for a period of 4 seconds in this embodiment, and the automatic engine stop operation is prohibited.

Next, FIG. 6 shows the control details of the control circuit 1 at the time of starting the engine, which is an embodiment of the control method for automatically stopping and starting the engine according to the present invention. In the figure, when a task is started in step 100, it is determined in the next step 102 whether or not the engine starting condition has been met. If the determination is 9, the same determination is repeated.9 If the engine starting conditions are satisfied and the determination is 9, the process moves to step 104, and in step 104, the control circuit 1 connects the sister relay 41 to the engine The starting signal 46 is output, and as a result, the starter signal 7 is sent from the starter relay 41 to the sister starter 42.
0 is output.

Next, in step 106, it is determined whether the engine has started or not.
In other words, it is determined whether or not the pulse of the starter signal 7o is at a low fall point. If it is determined in step 106 that the engine has not been started, the same determination is repeated.

On the other hand, if it is determined in step 106 that the engine has started, automatic stopping of the engine by lR8 is prohibited in the next step 108. That is, an engine automatic stop prohibition signal is output. Then, in the next step 110, lR8
(e.g. 4 seconds) to prohibit automatic engine stop due to
Thailand is set! is started. Furthermore, in the next step 112, it is determined whether or not the contents of the timer have reached the set value, and if it is determined that the contents have not reached the set value, the same determination is repeated.

On the other hand, if it is determined in step 112 that the content of the timer has reached the set value and is 9, the process moves to step 114, and in step 114, the inhibition of automatic engine stop by lR8 is canceled. That is, at this point, the engine automatic stop prohibition signal (pulse signal) falls. Then, in the next step 116, the tie! is reset and the task ends at step 118.

As explained above, the present invention is configured such that after setting the engine automatic stop/start function, the engine is started based on the function, and then the automatic engine stop operation is prohibited for a predetermined period of time. The frequency of starting the starter can be reduced, and as a result, deterioration in battery performance can be prevented.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of an automatic engine stop/start device to which the present invention is applied, FIGS. 2 to 4 show operating modes in the control circuit 1, and FIG. 2 shows operating modes when lR8 is set. , Fig. 3 is an explanatory diagram showing the operating mode when the engine is automatically stopped, Fig. 4 is an explanatory diagram showing the operating mode when the engine is automatically started, and Fig. 5 is an explanatory diagram showing the relationship between the starter signal and the engine automatic stop prohibition signal. timing chart shown,
FIG. 6 is a flow chart showing an embodiment of the control method for automatically stopping and starting the engine according to the present invention. 1... Control circuit, lO... Main switch, 12.
...Vehicle speed sensor, 14...Ignition circuit, 18 people, 18B
...Clutch switch, 28-- (Tsuteri voltage sensor, 40-fuel cut relay, 41--starter relay, 42--starter. Agent: Tatsuyuki Unuma (and 2 others)

Claims (1)

[Claims] In a device that automatically stops or starts the engine under predetermined conditions, after setting the engine automatic stop/start function, the engine is started based on the function, and then the engine automatic stop operation is performed for a specified time. A control method for automatically stopping and starting an engine that prohibits mold.