JPH10184504A - Start confirming device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce number of revolutions which it is judged that an engine is not started regardless of that the engine is started actually by judging that the engine is normally started when engine speed having prescribed rate or more is held for a prescribed time after a cell motor is stopped. SOLUTION: Pulse which is proportional to engine speed from a tachometer 21 and signals from sensors 41 to 44 are inputted to an input port of a micro computer 11 of a start confirming device 10 in an engine for an automobile. In the microcomputer 11, it is judged that an engine is normally started when engine speed having a first rate or more of a prescribed engine speed is held for a second prescribed time in a first prescribed time, from rotating start of a cell motor and when, in the case where a rate lower than the first rate is set as a second rate, engine speed having a second rate or more of a prescribed engine speed is held for a fourth prescribed time within a third prescribed time after stopping of the cell motor and.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for confirming the start of an automobile engine.

[0002]

2. Description of the Related Art In a conventional starting confirmation apparatus for an automobile engine, a starter motor is remotely started via a remote controller, and thereafter, the number of revolutions of the engine is detected, and if the number of revolutions is higher than a predetermined number of revolutions. If so, it is determined that the engine has started normally. After that, the start of the starter motor is stopped, and the rotation of the engine is continued for a predetermined timer time.

[0003]

In the above conventional example, when the engine is actually started, but knocking or the like occurs, the detected engine speed is reduced to the predetermined value. May not be reached. In this case, if the ignition is kept on, the engine normally rotates within several tens of seconds after that, as in the case of normal idling.

In the above case, however, it is determined that the engine is actually started, but not started, and an operation of restarting the starter motor is executed. In this case, there is a problem that the life of the starter is shortened, and there is a problem that the battery is wasted by unnecessary start of the starter.

An object of the present invention is to provide an automobile engine start confirmation device capable of minimizing the number of times that the engine is actually started, such as knocking, but the number of times the engine is determined not to be started is reduced as much as possible. It is intended for.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a start-up confirmation apparatus for an automobile engine which detects that the engine has started normally after the start of rotation of a starter motor. During a predetermined period of time, the number of rotations equal to or greater than the first percentage of the predetermined number of rotations
If the number of rotations equal to or more than the second ratio of the predetermined number of rotations is maintained for the fourth predetermined time during the third predetermined time after the stop of the starter motor, the engine is started. This is a start confirmation device that determines that the vehicle has started normally.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing an automobile engine start confirmation device 10 according to one embodiment of the present invention.

[0008] The apparatus 10 for confirming the start of an automobile engine
Is an automobile engine start confirming device for rotating the starter motor and detecting that the engine has started normally after the rotation is stopped.
And a receiving unit 12 and a relay circuit 13.

Around the start confirmation device 10, a pulse output means 20 for outputting a pulse proportional to the engine speed, a tachometer 21, and a key switch circuit 30
, An accessory circuit 31 and an ignition circuit 32
, A self-motor circuit 33 and a side brake sensor 41
, Hood opening / closing sensor 42, parking position sensor 43, door opening / closing sensor 44, remote controller 50
Are provided.

The pulse output means 20 is an example of an engine speed detecting means for detecting the engine speed.

The remote controller 50 is provided with a start button 51, a stop button 52, and a threshold change button 53.

A pulse proportional to the number of revolutions of the engine is input to an input port of the microcomputer 11 through a lead wire drawn from an input terminal of the tachometer 21, and signals from the sensors 41 to 44 are input. Also,
A signal indicating the operation state of the engine key is input, and a signal from the receiving unit 12 is input. The microcomputer 11 realizes the operation of the flowchart shown in FIG.

The microcomputer 11 determines that the cell motor has not been rotated for a second predetermined time during a first predetermined time period from the start of rotation of the cell motor for a second predetermined time period. This is an example of a starter stopping means for stopping the operation.

The microcomputer 11 maintains a rotation speed equal to or more than a first ratio of the predetermined rotation speed for a second predetermined time during a first predetermined time from the start of rotation of the starter motor. When the ratio lower than the first ratio is set to the second ratio, the third ratio is set after the stop of the starter motor.
An example of engine start determination means for determining that the engine has started normally when the rotation speed equal to or more than the second ratio of the predetermined rotation speed is maintained for the fourth predetermined time during the predetermined time period. It is.

Further, after the first predetermined time from the start of rotation of the starter motor, the microcomputer 11 maintains a rotation speed equal to or more than a first ratio of the predetermined rotation speed for a second predetermined time, During the third predetermined time after the stop of the starter motor, the rotation speed equal to or higher than the second ratio of the predetermined rotation speed is lower than the second ratio even if the rotation speed is not maintained for the fourth predetermined time. When the ratio is set to the third ratio, the third rotation of the predetermined rotation speed after the stop of the starter motor is performed.
This is an example of a means for determining that the engine has not started normally if the engine is rotating at a ratio of not more than.

FIG. 2 is a flowchart showing the operation of the above embodiment.

First, after the preheating is completed, the accessory power supply is turned off and the starter motor is turned on (S1).
In the case of a diesel vehicle, the preheat is heating of the glow lamp (the engine cannot be started while the vehicle is being heated), and in the case of a gasoline vehicle, it is a stable time after ignition.

Here, the rotational speed during idling is set as a threshold value. Then, the time when the engine speed at that time is 80% or more of the threshold is measured,
% Or more (0.5 second or more (second predetermined time T2)) (S2), the starter motor is stopped (S2).
4).

On the other hand, if the engine speed does not reach 80% or more of the threshold value, or if the time cannot be maintained for 0.5 seconds even if it exceeds 80%, the starter motor is turned on. , And waits for 5 seconds (first predetermined time T1) (S3). And even after 5 seconds,
The time when the engine speed is 80% or more of the threshold is set to 0.
The stop motor is also stopped when it cannot be maintained for more than 5 seconds. It should be noted that monitoring is performed for a certain period of time after the cell is turned off, and if the start cannot be detected during that time, a retry is performed.

The engine speed is 80% of the threshold value.
After the starter is stopped by maintaining the above time for 0.5 second or more (S4), if the time during which the engine speed is 50% or more of the threshold is 2 seconds or more,
It is determined that the engine has been successfully started, and the timer operation is started (S9).

However, when the engine speed is equal to the threshold value of 80,
% Or more for 0.5 seconds or more, and after the starter is stopped (S4), the engine speed does not reach 50% or more of the threshold value, or the engine speed becomes 50% or more of the threshold value. % Or less than 2 seconds (fourth predetermined time T4) (S5), turn off the starter motor (S4) for 6 seconds (third predetermined time). Wait for the time T3) (S6). This 6
If the engine speed is 50% or more of the threshold
If it has been maintained for more than one second, the timer operation is started to start the engine. If the rotation speed after 6 seconds is less than 25%,
The retry operation is started as a start failure (S7). If it exceeds 25%, and if the number of time extensions is less than 10, the time is further extended for 6 seconds (S8, S10), and the above operations (S5 to S6) are repeated.

In the above embodiment, the engine is actually started, such as knocking, but the number of times that the engine is determined not to be started can be reduced as much as possible.

FIG. 3 is a diagram showing a change in the number of revolutions of an engine with an automatic choke in the above embodiment.

In the example shown in FIG. 3, the threshold value (80% of the idling storage value) during the start of the starter motor is set at 700 rpm, and the number of rotations and the movement of the starter motor when the engine is started normally are shown.

When the starter motor is turned on, a rotational speed of the starter motor of about 400 rpm is detected. In this example, about 1
After a lapse of seconds, the engine starts and the number of revolutions becomes 1000 rpm. When the rotational speed exceeds 700 rpm for 0.5 seconds, the start of the engine is detected and the starter motor is turned off. After the cell motor is turned off, the timer operation starts because the threshold value (50% of the idling storage value) after the cell motor is turned off for 2 seconds.

FIG. 4 is a diagram showing a change in the number of revolutions of an engine with an automatic choke in the above embodiment.

FIG. 4 is a diagram showing a measurement example in the case where normal start-up can be performed by switching the threshold after turning off the starter motor.

When the starter motor is turned on, the number of rotations of the starter motor is detected. Once the engine starts, it increases once,
Threshold value while the starter motor is on (80 of idling stored value)
%) For more than 0.5 seconds, so that the starter motor is turned off.

When the starter motor is turned off, the number of revolutions is equal to the threshold value when the starter motor is on (80% of the idling storage value).
Even if it is turned off, the threshold value after the starter motor is turned off (50% of the idling memorized value) is switched, so it is possible to detect the number of revolutions exceeding the engine start threshold value for 2 seconds and start timer operation as normal start. .

FIG. 5 is a diagram showing a change in the number of revolutions of the engine with an automatic choke in the above embodiment.

The example shown in FIG. 5 is an example in which the engine starts knocking after the cell motor is turned off, such as when it is cold, and it takes a little time for the engine to operate normally.

While the cell motor is ON, the threshold (80% of the idling stored value) during the cell motor ON is detected for 0.5 seconds, and the cell motor is turned OFF. After turning off the cell motor, knocking occurred due to cold weather and the engine was not stopped, but the threshold value after the cell was turned off (50% of the idling memory value)
The engine is running without exceeding.

Normally, after 6 seconds, it is detected that the engine has not been started, and the engine is restarted. However, since it exceeds the third threshold value (25% of the idling memory value), the engine is restarted up to 10 times every 6 seconds. And wait for the engine to start.

FIG. 5 shows an example in which the oil or the like softens during this waiting, knocking subsides, and a normal start is performed about 10 seconds after exceeding the threshold value (50% of the idling memorized value) after the cell is turned off.

In the above embodiment, 80% of the threshold, 50%
%, 25%, respectively, the first percentage, the second percentage, and the third percentage.
In the case of the ratio, the first ratio, the second ratio, and the third ratio may be set to percentages other than the above percentage.

In the above embodiment, the first predetermined time T1 is set to 5 seconds, the second predetermined time T2 is set to 0.5 seconds, and the third predetermined time T3 is set to 60 seconds.
The second predetermined time T1 and the second predetermined time T1 are set to two seconds as the fourth predetermined time T4.
2. As a third predetermined time T3 and a fourth predetermined time T4,
A time other than the above may be set.

FIG. 6A shows an example of the above embodiment.
FIG. 6 (2) is a diagram showing a case where the engine has not been started when 5 seconds have elapsed at 80% or less, and FIG. 6 (2) is a diagram showing a case where the engine has not started when 5 seconds have elapsed at 80% or less.

[0038]

According to the present invention, the number of times that the engine is actually started, such as knocking, but it is determined that the engine has not been started can be reduced as much as possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a vehicle engine start confirmation device 10 according to one embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the embodiment.

FIG. 3 is a diagram showing a change in the rotation speed of an engine with an automatic choke in the embodiment.

FIG. 4 is a diagram showing a change in the rotation speed of an engine with an automatic choke in the embodiment.

FIG. 5 is a diagram showing a change in the rotation speed of an engine with an automatic choke in the embodiment.

FIG. 6 is a diagram showing a case where the engine is not started and a case where it is not started when 5 seconds have elapsed at 80% or less in the embodiment.

[Explanation of symbols]

 Reference numeral 10 denotes a device for confirming the start of an automobile engine. 11 denotes a microcomputer. 20 denotes a means for outputting an engine speed pulse.

Claims (3)

[Claims] 1. An automobile engine start confirmation device for rotating a cell motor and detecting that the engine has started normally after the rotation has stopped, an engine speed detecting means for detecting an engine speed, and the cell motor. During the first predetermined time from the start of rotation of
When the rotation speed equal to or more than the first ratio of the predetermined rotation speed is maintained for the second predetermined time, the starter motor stopping means for stopping the starter motor, and during the first predetermined time from the start of rotation of the starter motor. ,
When the rotation speed equal to or higher than the first rotation speed of the predetermined rotation speed is maintained for the second predetermined time and the second rotation speed is set to a lower rotation speed than the first rotation speed, the second rotation speed after the stop of the starter motor is stopped. An engine start determining means for determining that the engine has started normally when the rotation speed equal to or higher than the second ratio of the predetermined rotation speed is maintained for a fourth predetermined time during the predetermined time period A start-up confirmation device for an automobile engine, comprising: 2. The engine control device according to claim 1, wherein the engine start determining means includes:
After the rotation speed equal to or more than the first ratio of the predetermined rotation speed is maintained for the second predetermined time, the second ratio of the predetermined rotation speed is maintained for a third predetermined time after the stop of the starter motor. Even if the above rotation speed is not maintained for the fourth predetermined time,
When the ratio lower than the ratio is set as the third ratio, the engine is rotated at a speed equal to or less than the third ratio at the predetermined rotation speed within a third predetermined time after the stop of the starter motor. And a means for judging that the engine has not been started normally. 3. The engine control device according to claim 1, wherein the engine start determination means includes:
After the rotation speed equal to or higher than the first ratio of the predetermined rotation speed is maintained for the second predetermined time, during the third predetermined time after the stop of the starter motor, the ratio lower than the second ratio is changed. Third
In this case, the engine continues to rotate at the third ratio or more of the predetermined rotation speed, and the rotation speed of the second rotation or more of the predetermined rotation speed is equal to or higher than the fourth specified speed. An apparatus for confirming the start of an automobile engine, which is means for determining that the engine has started normally when the time is maintained.