JP2000130299A - Starter protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an intermittent operation for thermally damaging a starter by starting time registering action after judgment is performed with a key switch operation in order to measure a lapsed time, and inhibiting an operation of the starter when the lapsed time is lapsed for a constant time or more after the starter is operated in association with an operation of the key switch. SOLUTION: When a key switch 4 is turned on in order to operate a starter 5 for cranking an engine 6, cranking is not normally executed. In the case where the key switch 4 is turned off once and then it is turned on again, a time registering action is performed by a current-carrying timer in a control circuit unit 2, a time registering time Tn is cumulated to output a current- carrying cumulating value T0. In the case of the current carrying cumulating value T0 > a current-carrying preventing set time T2, a non current-carrying condition of the switch circuit is held. In the case of a stop cumulating time T0' > the stop set time T2 after the key switch 4 is turned off from a turning-on condition, the stop cumulating time T0' and the current-carrying cumulating time T0 are reset.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter protection device for preventing a starter from intermittently operating in a short time due to an erroneous key switch operation and protecting the starter from thermal damage.

[0002]

2. Description of the Related Art Conventionally, as a prior art, a battery and a load are connected by turning on a key switch of a vehicle, power is supplied to the load, and power to the load is cut off after a time set by a timer operation. 57-927
Japanese Patent Application Publication No. 9-No. This prior art connects a battery and a load by turning on a key switch, supplies power to the load and drives the load for a set amount, and then operates a timer to shut off the power after a set time has elapsed, thereby reducing the load on the load. This is to stop unnecessary power supply.

[0003]

In a case where battery power is supplied to a load under the operation of a key switch for operating a starter of a vehicle, the key is again turned on for a timer set time until the power supply is cut off. The starter can be operated by turning on the switch, but if the starter is operated intermittently within a short time, there is a problem that the starter is thermally damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. The key switch is turned on to activate the starter, and after the key switch is turned off, the key switch is turned on for a certain period of time. The present invention relates to a starter protection device that protects the starter by prohibiting the operation of the starter.

[0005]

According to a first aspect of the present invention, there is provided a starter protection device, comprising: an operation determining means for determining an operation of a key switch; The apparatus includes a time measuring means, a starter operating means for operating a starter in accordance with an operation of the key switch, and an operation inhibiting means for inhibiting the operation of the starter after the time measuring means has measured for a predetermined time or more.

The operation prohibiting means of the starter protection device according to the second aspect of the present invention holds the prohibition state for a predetermined time after the operation of the starter is prohibited.

The operation prohibiting means of the starter protection device according to the third aspect of the present invention continuously prohibits the operation of the starter when the operation of the key switch is determined after the elapse of the operation prohibition time of the starter.

The time measuring means of the starter protection device according to the invention of claim 4 clears the measured time when an emergency signal other than a key switch is inputted.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a starter protection device according to the present embodiment. According to this device, the power cutoff control for the starter to be protected is
This is performed by opening / closing control of a starter main switch operated by a power control element including a MOS FET or a bipolar transistor.

In FIG. 1, 1 is a starter main switch for controlling power supply to the starter, 2 is a control circuit for controlling opening and closing of the starter main switch 1, 3 is a battery mounted on the vehicle, 4 is a battery from the battery 3. A key switch for transmitting a power supply voltage to the control circuit unit 2, a starter 5 which operates by receiving a power supply voltage from the battery 3 through the control circuit unit 2 by an on operation of the starter main switch 1, and an engine 6 which is started by the operation of the starter 5 It is.

The configuration of the starter main switch 1 includes a stator C 1 connected to a plus terminal of the battery 3,
A stator C2 connected to the power terminal of the starter 5, a rod L provided with a movable contact C at the tip thereof for contacting the stators C1 and C2, one end connected to the output of the control circuit unit 2, and the other end grounded Holding coil CL2, one end of which is in control circuit unit 2
And a suction coil CL1 whose other end is connected to the power supply terminal of the starter 5.

The operation of the starter main switch 1 is as follows. When the attracting coil CL1 and the holding coil CL2 are excited by the output current from the control circuit section 2, the rod L is pushed up and the movable contact C at the tip contacts the stators C1 and C2. Let it. As a result, a closed circuit is formed between the battery 3 and the starter 5, and the power supply voltage is supplied from the battery 3 to the starter 5 through the starter main switch 1. When the power supply voltage is supplied to the starter 5, the potential between the attraction coils CL1 becomes the same, so that only the holding coil CL2 is energized by applying the battery voltage, so that the position of the rod L is held and the power supply voltage is applied to the starter 5. It is supplied continuously. Then, the bias of the starter main switch 1 is maintained.

FIG. 2 shows a relay control system for operating the starter main switch 1 by sending an exciting current from the battery 3 to the suction coil CL1 and the holding coil CL2 of the starter main switch 1 through an auxiliary relay energized and controlled by the control circuit section 2A. FIG. According to this method, the exciting coil C of the auxiliary relay 7
One end of L3 is grounded by the control circuit 2A, and the other end is connected to the plus terminal of the battery 3 through the key switch 4.

When the key switch 4 is turned on and the control circuit 2A is operated to ground one end of the exciting coil CL3, an exciting current flows through the exciting coil CL3 through the key switch 4 and the control circuit 2A. As a result, the auxiliary relay 6 is energized and the suction coil C of the starter main switch 1 is turned on.
L, the exciting current flows from the battery 3 to the holding coil CL2, and the starter main switch 1 operates.

The movable contact C of the auxiliary relay 6 is a stator C1.
By contacting 0 and C20, the exciting current flows from the battery 3 to the attraction coil CL1 and the holding coil CL2 of the starter main switch 1 through the auxiliary relay 6 to operate. This relay control method uses the suction coil CL1, the holding coil CL
Since the exciting current flows through the auxiliary relay 7 through the auxiliary relay 7, a high exciting current can be caused to flow in a less expensive manner as compared with the electronic control system in which the exciting current is sent from the MOSFET or the bipolar transistor of the control circuit unit 2 shown in FIG. .

Next, the protection operation of the starter by the control circuit unit 2 will be described with reference to the flowchart of FIG. The operation of the protection device will be described in the following four operations. 1. At the time of the normal operation in which the key switch 4 is turned on and the starter operates. 2. Even if the key switch is turned on again after the key switch 4 is turned off and the starter stop set time elapses before the starter stop set time elapses, a starter thermal damage preventing operation for inhibiting the starter operation until the starter stop set time elapses. 3. OFF even if key switch 4 is turned OFF from ON
A continuous energization prevention operation that shuts off energization to the starter main switch 1 when the state does not return. 4. Even after the key switch 4 is turned off, even if the key switch is turned on again, a re-biting prevention operation for cutting off the power supply to the starter main switch 1 until a preset re-biting prevention set time (re-input prevention set time) elapses.

1. At the time of normal operation: First, when the key switch 4 is turned on by the driver when the engine 6 is started, O
The N signal is input to the control circuit unit 2 (Step S1).
At this time, since the stop timer function of the control circuit unit 2 is not operating, the stop cumulative value Tn 'does not exceed 0, and Tn'> 0.
(Step S2). Therefore, step S5
Then, an energization timer Tn for determining an energization time of a switch circuit (hereinafter simply referred to as a switch circuit) in the control circuit unit 2 for operating the starter main switch 1 is operated (step S5).

The counted timer value is accumulated to provide an energized accumulated time T0 (step S6). This cumulative current value T
0 is compared with a preset energization prevention set time T2 (step S7), and the switch circuit is energized while the energization accumulation value T0 is shorter than the energization prevention set time T2 (step S8). As a result, the starter main switch 1 is turned on to supply the power supply voltage from the battery 3 to the starter 5.

Next, when the key switch 4 is turned off (step S1), the energization cumulative time T0 calculated in step S6 is compared with the stop set time T1 (> T2) (step S12). If it is determined that the cumulative energization time T0 is shorter than the stop set time T1, the stop timer Tn 'is operated to maintain the operation prohibition state of the starter 5 due to the ON operation of the key switch 4 for a predetermined time (step S).
13).

The counted timer value is accumulated, and the accumulated stop time T0 'is output as a calculated value (step S14).
The cumulative stop time T0 'is compared with the preset stop time T2 (step S15). When the cumulative stop time T0' is shorter than the preset stop time T1, the stop timer value is set until the cumulative stop time T0 'becomes longer than the preset stop time T1. Accumulate Tn.

In step S15, if the cumulative stop time T0 'has become longer than the preset stop time T1, the cumulative energizing time T
0 and the cumulative stop time T0 'are reset.

2. Starter thermal damage prevention: After the key switch 4 is turned off, the key switch 4 is turned on again before the cumulative stop time T0 'does not exceed the stop set time T1.
If the switch circuit is energized with N to activate the starter 5, thermal damage may be caused.

In this operation, if it is determined in step S1 that the key switch 4 has been turned on again, the process proceeds to step S5 through steps S3 and S4.

In step S5, the timer operation is again performed by the energization timer, and in step S6, the counted time Tn is accumulated to output the energization accumulated value T0.

Since the cumulative energizing time T0 is not reset before the key switch 4 is turned ON, the cumulative energizing time T0 is a value added in step S6. Prevention set time T
2 (step S7), and the non-energized state of the switch circuit is maintained (step S10).

After the key switch 4 is turned off from ON, if the cumulative stop time T0 'becomes longer than the preset stop time in step S15, the cumulative stop time T0 and the cumulative energizing time T0' are reset. Therefore, the energization prevention set time T2 becomes longer than the energization accumulation time T0, and when the key switch 4 is turned ON, the steps S2 to S2 are performed in the same manner as in the normal operation.
The switch circuit is turned on through the process of step 8.

3. Continuous energization preventing operation: Normally, when the key switch 4 is turned to the original position after the starter 5 is operated by turning the key switch 4 in the ON direction, the key switch 4 is turned off.
Although the state is changed to the F state, the key switch 4 is not returned to the OFF state due to a defective return despite the OFF operation, and if the switch is kept ON, the switch circuit is continuously energized. Therefore,
This operation prevents continuous energization.

First, when the key switch 4 is turned on (step S1), the stop timer is not operated, and the energization timer Tn for determining the energization time is operated (step S1).
5).

The counted timer value is accumulated, and the energized accumulated time T0 is output as a calculated value (step S6). The cumulative energization value T0 is a preset energization prevention set time T2.
(Step S7), and the switch circuit is energized while the energization accumulation value T0 is shorter than the energization prevention set time T2 (step S8). However, O of key switch 4
When the N state continues, the current supply cumulative time T0 is determined in step S6.
Are added.

If it is determined in step S7 that the cumulative energization time T0> the energization prevention set time T2 is determined, the switch circuit is turned off (step S10). If the key switch 4 is still ON even after the non-energized state, the cumulative energized time T0 is further accumulated in step S6, and the cumulative energized time T0> the energization prevention set time T2 is determined in step S7. Maintain de-energization.

Next, the stop set time T1> the cumulative energization time T
If the key switch 4 is ON when 0 is determined, the operations of steps S5 to S10 are repeated to maintain the non-energized state of the switch circuit.

4. Prevention of re-biting: After the key switch 4 is turned on, before the cumulative stop time T0 ′ measured with the key switch 4 being turned off exceeds the stop set time T1,
When the key switch 4 is turned on again, this ON operation is invalidated and the switch circuit is de-energized, thereby preventing the starter 5 from being reactivated in a short time.

First, when the key switch 4 is turned on as an operation (step S1), the stop timer is running, so that the power supply timer Tn for determining the power supply time is activated (step S5).

The measured timer value is accumulated, and the energized accumulated time T0 is output as a calculated value (step S6). The cumulative energization value T0 is a preset energization prevention set time T2.
(Step S7), and the switch circuit is energized while the energization accumulation value T0 is shorter than the energization prevention set time T2 (step S8).

When the key switch 4 is turned off (step S1), the energization cumulative value T0 calculated in step S6 is compared with the stop set time T1 (step S12). If it is determined that the energization timer accumulated value T0 is shorter than the stop set time T1, the stop timer Tn 'is operated (step S13).

The counted timer value is accumulated, and the accumulated stop time T0 'is output as a calculated value (step S14).
This cumulative stop time T0 'is compared with the preset stop time T1 (step S15). When the cumulative stop time T0' is shorter than the preset stop time T1, the stop timer value is set until the cumulative stop time T0 'becomes longer than the preset stop time T1. Accumulate Tn.

However, if the key switch 4 is turned on again before the cumulative stop time T0 'becomes longer than the stop set time T1, the stop timer is activated and the stop timer value is larger than 0, so that the routine proceeds to step 3. .

In step S3, it is determined whether the cumulative stop time Tn 'has exceeded the set time T3 for preventing re-biting, and if not, the switch circuit is de-energized (step S4).
If it is determined in step 3 that the cumulative stop time Tn 'has exceeded the re-biting prevention set time T3, the flow advances to step S5 to enter a switch circuit energizing operation associated with the key switch 4 ON. In this embodiment, the key switch 4 is turned on and off.
Although the start-stop operation of the starter 5 is controlled by F, an emergency signal (not shown) is input from the outside to the control circuit unit 2 so that the pseudo key switch is recognized, the switch circuit is turned on, and the starter is turned on. It may be activated. Alternatively, the key switch OFF is pseudo-recognized by the emergency signal, and if the cumulative stop time T0 ′ becomes longer than the preset stop time T1, the current supply cumulative time T0 and the cumulative stop time T0.
The starter may be operated by resetting 0 'to make the switch circuit conductive. As a result, the vehicle can be moved in an emergency without key switch operation.

[0039]

According to the first aspect of the present invention, the operation determining means for determining the operation of the key switch, the time measuring means for starting the timing operation after the determination of the operation of the key switch and measuring the elapsed time, and Since the starter operating means for operating the starter in accordance with the operation of the switch and the operation prohibiting means for prohibiting the operation of the starter after the time measuring means has measured for a predetermined time or more, the intermittent operation for thermally damaging the starter is provided. Has the effect that it can be prohibited.

According to the second aspect of the present invention, the operation prohibiting means holds the operation prohibition state for a predetermined time after prohibiting the operation of the starter, so that there is an effect that the restart of the starter can be prohibited within a predetermined time.

According to the third aspect of the present invention, the operation prohibiting means continuously prohibits the operation of the starter when the operation of the key switch is determined after the elapse of the prohibition of operation of the starter. There is an effect that the continuous operation of can be prohibited.

According to the fourth aspect of the present invention, the time measuring means clears the measured time when an emergency signal other than the key switch is input, so that the starter can move the vehicle in an emergency.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a first embodiment of a starter protection device according to the present invention.

FIG. 2 is an overall configuration diagram of another embodiment of a starter protection device according to the present invention.

FIG. 3 is a flowchart illustrating an operation of the starter protection device according to the present embodiment.

[Explanation of symbols]

1 Starter main switch, 2, 2A control circuit section,
4 Key switch, 5 starter, 6 engines.

Continuing on the front page (72) Keiichi Ogura, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo, Mitsubishi Electric Co., Ltd. (72) Inventor Shigeru Shiroyama 2-3-2, Marunouchi, Chiyoda-ku, Tokyo, Mitsubishi Electric F term in the company (reference) 5H001 AA07 AB05 AC01 AD01

Claims (4)

[Claims] 1. An operation determining means for determining an operation of a key switch, a time measuring means for starting a timing operation after determining the operation of the key switch and measuring an elapsed time, and a starter for operating a starter in accordance with the operation of the key switch. A starter protection device comprising: an operation unit; and an operation prohibition unit that prohibits the operation of the starter after the time measurement unit measures for a predetermined time or more. 2. The starter protection device according to claim 1, wherein the operation prohibiting unit holds the prohibition state for a predetermined time after prohibiting the operation of the starter. 3. The operation prohibiting means continuously prohibits the operation of the starter when the operation of the key switch is determined after the elapse of the operation prohibition time of the starter.
2. The starter protection device according to 1. 4. The starter protection device according to claim 1, wherein the time measurement means clears the measurement time when an emergency signal other than a key switch is input.