JPH0579434A - Starter starting controller - Google Patents

Abstract

PURPOSE:To start an engine by effectively utilizing residual electric power when a starter is operated in the condition close to a completely discharged battery. CONSTITUTION:This is a starter starting controller which has a controller comprising an input/output circuit 16 for opening the contact point of a relay 3 after a constant time when a key switch 2 is turned on for driving the starter, a microcomputer 17 which detects battery voltage at the time of operating the starter, and makes signal processing in which an opening time of a relay contact oint is adjusted according to the length of time when the detected voltage is less than a specified value voltage, and an input/output circuit. Consequently, since the battery power can be effectively utilized at the time of starting the engine, complete electric discharge of the battery may seldom take place.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to controlling a starter of an internal combustion engine mounted on a vehicle, and more particularly to starting the engine in response to a battery state.

[0002]

2. Description of the Related Art As a conventional device, it has been disclosed in JP-A-60-69262.

The above example is control in which the starter is not activated during inertial rotation or engine rotation. This did not take into account the downtime at the next restart.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to use the remaining electric power effectively to start the internal combustion engine (engine) when the starter is operated with the battery being nearly discharged.

[0005]

[Means for Solving the Problems] Means for detecting a battery voltage when the starter is operating, means for detecting whether or not this voltage is below a specified value, and a ratio for falling below the specified value. By the means, the size of the pause is changed.

[0006] The magnitude of time varies depending on the outside air temperature.

[0007]

[Function] The battery voltage when the starter is operated is
It depends on the discharge rate of the battery and on the ambient temperature. When the discharge rate of the battery is high, once the starter is operated, it takes time for the voltage to return to the original level. Then, when the voltage is not restored and the starter is operated again,
The crank speed does not increase and the engine cannot start.

Therefore, since the battery voltage when the starter is operated for the first time changes the pause time depending on the ratio below the specified value, the battery voltage when the starter is operated next is returned to the original engine voltage. Easy to start.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

The battery 1, the key switch 2, the contacts of the relay 3, the attraction coil 7 of the magnet switch 6, and the brush 10 of the motor 9 are connected in series.

The main contact 11 is turned on and the holding coil 8
Then, it continues to be turned on, current flows through the motor 9, and the magnetic pole 12 causes the motor 9 to continue to rotate.

The rotation of the motor 9 is decelerated by the planetary gear 13 and transmitted to the pinion 14 to rotate the ring gear of the engine 15 to start the engine.

Immediately after turning on the key switch 2, the engine 1
5 should start, but if not start key switch 2
If the battery is continuously turned on, the battery 1 will be discharged.

In order to prevent this, the coil 5 of the relay 3
Energize to open contact 4. The discharge current of the battery 1 is once stopped and the battery 1 is recovered. In other words, it has a down time. After that, the contact 4 of the relay 3 is closed again to operate the starter.

The input / output circuit 16 has a function of inputting the signal of the key switch 2, the battery voltage, the engine speed, the outside air temperature, operating the relay 3, or outputting the operation of the fuel injection slip, and makes a judgment or the like. The operation of the control circuit 18 performed by the microcomputer 17 will be described with reference to FIG.

FIG. 2 shows the case where the key switch is continuously turned on. This is the case where the engine does not start even if the T1 starter is operated for the specified time. Then, the time T2 in which the average value of the battery voltage is smaller than the specified voltage V1 is detected. The pause time T3 is adjusted according to the magnitude of the time T2. Then, when the T1 starter is operated again for the specified time and is started, that is, when the engine speed becomes close to the idle speed, a current is supplied to the coil 5 of the relay 3 so as to stop the operation of the starter.

The specified voltage V1 is set as shown in FIG. 3 depending on the outside air temperature.

When the outside air temperature is low (-), as shown in FIG. 4, only the starter is operated when the key switch 2 is turned on. This is because the lubricating oil, such as engine oil, circulates around the rotating portion to facilitate movement, and the crank rotation speed is increased to start the engine.
This is because there is a high probability that the engine can be started even if the discharge rate is high.

FIG. 5 shows a software flowchart of the microcomputer for performing the operation of FIG.

FIG. 6 shows a software flowchart of the microcomputer for performing the operation of FIG.

[0021]

According to the present invention, since battery power can be effectively used for engine starting, the battery discharge at the time of starting is reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a starter start control device according to the present invention.

FIG. 2 is a characteristic diagram of starter operating time and rest time.

FIG. 3 is a diagram showing a relationship between a specified voltage and an outside air temperature.

FIG. 4 is a characteristic diagram of fuel injection control when the outside air temperature is low.

5 is a software flowchart of the microcomputer of FIG.

6 is a software flowchart of the microcomputer of FIG.

[Explanation of symbols]

1 ... Battery, 2 ... Key switch, 3 ... Relay, 4 ... Contact, 5 ... Coil, 6 ... Magnet switch, 7 ... Suction coil, 8 ... Holding coil, 9 ... Motor, 10 ... Brush,
11 ... Main contact, 12 ... Magnetic pole, 13 ... Planetary gear, 14
... pinion, 15 ... engine, 16 ... input / output circuit, 1
7 ... Microcomputer, 18 ... Control circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Katsumi Otsuki 2520 Takaba, Katsuta-shi, Ibaraki Pref., Automotive Equipment Division, Hitachi, Ltd. (72) Eiji Naito 2477 Kashima Yatsu Kashima-yatsu, Katsuta-shi, Ibaraki Prefecture 3 Hitachi Automotive Engineering Co., Ltd. (72) Inventor Koichi Tadokoro 2520 Takaba, Katsuta City, Ibaraki Prefecture Hitachi Automotive Systems Division

Claims (2)

[Claims] 1. An internal combustion engine comprising an engine, a battery, a starter, a key switch for driving the starter, a relay in series, an engine control device, an outside air temperature sensor, and an engine rotation sensor, and a key switch for driving the starter. The battery voltage when the starter and the input / output circuit that opens the contact of the relay after a certain period of time from turning on is detected, and the relay contact is opened depending on the length of time below a certain specified voltage. A starter start control device comprising a control device including a microcomputer for performing signal processing for adjusting time and an input / output circuit. 2. When the temperature is cold below a certain specified temperature, the microcomputer and the input / output circuit for issuing a signal that moves the starter but does not operate the fuel injection nozzle of the engine after the key switch is turned on, and the following: A starter start control device comprising a control device for performing the control according to claim 1 when a starter drive signal is applied.