JPS58221725A - Starter-motor driving circuit for car equipped with automatic speed change gear - Google Patents

Abstract

PURPOSE:To detect the start disabling state of a starter-motor which is caused by burning-out of a fuse by fitting a fuse in each position detecting switch circuit for parking position and neutral position and installing a circulit which alarms burning-out of fuse. CONSTITUTION:Indication lamps 8 and 9 and fuses 4a and 4b are connected to a parking position detecting switch 5 and a neutral position detecting switch 6, respectively, and an ignition relay 13 is also connected to those switces through diodes 12a and 12b. The contact 13b of the ignition relay 13 is connected to a starter switch 3 to start a starter motor 14. An alarm device 17 is connected to each of switch 5, 6 through gates G1-G4, and alarms burning-out of each fuse 4a, 4b. Thus, start-disabling state due to burning-out of fuse caused by a motor load 16 can be alarmed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention forms a power supply circuit to an ignition relay via a shift position detection switch that closes when the shift lever of an automatic transmission is operated to a parking position or a neutral position, and In the starter motor drive circuit that drives the starter motor by activation of the above-mentioned ignition relay by operation, a fuse is individually provided in each of the energizing circuits of the shift position detection switches for the parking position and the neutral position, and the fuses are connected to each other. The present invention relates to a starter motor drive circuit for a vehicle equipped with an automatic transmission, which is configured to issue an alarm when at least one of the following is disconnected.

2. Description of the Related Art Conventionally, there is a starter motor drive circuit installed in an automatic transmission as shown in FIG.

In FIG. 1, the positive electrode of the battery 1 is connected to the on contact 3a and the on contact 3 via a safety device 2 such as a hiege pull link.
The ignition switch 30 is connected to an ignition switch 3 consisting of a start contact 3b that can be switched with the switch A closed, and a shift lever of an automatic transmission, which is a shift position detection switch, is connected to the ignition switch 30 through a fuse 4 to an on contact 3a.
A parking position detection switch 5, which is closed when the shift lever is in the parking position 0, and a bidirectional position detection switch 6, which is closed when the shift lever is in the neutral position, are connected in parallel. The position detection switch 5 is connected to a diode 12a for blocking current backflow, and the neutral position detection switch 6 is connected to a diode 1 for blocking current backflow.
2b, each of the ignition relays 13 is connected to a relay coil 13a whose one end is grounded. Then, the parking position detection switch 5 and the diemate 12
A parking position indicator lamp 8 that lights up when the parking position detection switch 5 is closed and a parking position indicator lamp 8 that lights up when the neutral position detection switch 6 is closed is located at the connection point between the a and the neutral position detection switch 6 and the diode 12b, respectively. A lighting neutral position indicator lamp 9 is connected. On the other hand, a relay contact 13b is inserted into a power supply line connecting the start contact 3b of the ignition switch 3 and the starter motor device 14, and is closed when the relay coil 13 is energized. When the engine is started, the shift lever is placed in the parking position or neutral position [&]L, and when the ignition switch 3 is switched to the on contact 3a, the ignition relay 13 is activated via the parking position detection switch 5 or the neutral position detection switch 6. When the relay contact 13b is energized and the ignition switch 3 is operated to the start contact 3b, power is supplied from the starter motor unit 1 to the starter motor device 14 through the start contact 3b of the ignition switch 3 and the relay contact 13b, and the starter motor device 14 is started. The main relay in the motor device 14 is activated, and the starter motor is started by supplying power from the energizer pull 15.

In addition, in Fig. 1, 7 is a backward position detection switch, and 10 is a reverse position detection switch.
is the shift lever reverse position indicator lamp, lla.

11b is a reversing light, and 16 is another electrical load.

By the way, in such a conventional starter motor drive circuit, in order to prevent the vehicle from starting at the same time as the starter motor is started, the ignition switch 3 is connected to the start contact 3b only when the shift lever is in the parking position or the neutral position. K is designed so that the starter motor can be started by the starting operation of switching.

However, the parking position indicator lamp 8. Neutral position indicator lamp9. Reverse position indicator lamp 10° Reverse light 11
If either a, llb, etc. is shorted due to a failure, or an overcurrent flows due to a failure of the electrical load 16,
Fuse 4 is blown and the starter motor cannot be started. In this case, you can replace the blown fuse, but it is impossible to tell whether the starter motor's inability to start is due to a blown fuse unless you inspect it. There was a problem.

The present invention has been made in view of the above, and has a starter motor drive circuit that can drive the starter motor only when the shift lever of an automatic transmission is operated to the parking position or the neutral position. In order to make it easy to drive the starter motor even if the fuse installed in the power supply line to the detection switch is disconnected, a fuse is installed in each power supply circuit for each shift position detection switch in the parking position and neutral position. The system is provided separately, and a warning is given when at least one of the fuses is blown to suggest driving at a shift position where the fuse is not blown.

Hereinafter, the present invention will be explained based on the drawings.

FIG. 2 is a circuit diagram showing one embodiment of the present invention. First, to explain the configuration, the positive electrode of the battery 1 is connected to the on contact 3a and the on contact 3 via the safety device 2 such as a fusible link.
The ignition switch 30 is connected to an ignition switch 3 consisting of a start contact 3b that can be switched with the switch a closed, and the ignition switch 30 on contact 3a has a parking position that is in the closed state when the fuse 4a and the shift lever of the automatic transmission are in the parking position. The detection switch 5, the current backflow blocking diode 12a, and the ignition relay 13, one end of which is grounded, are connected in series.

Further, a neutral position detection switch 6 which is closed when the fuse 4b and the shift lever of the automatic transmission are in the neutral position, a diode 12b for blocking reverse flow, and a relay coil 13a are connected in series. A parking position indicator lamp 8 is connected to the connection point between the parking position detection switch 5 and the diode 12a so as to turn on when power is supplied when the parking position detection switch 5 is closed. 12
A neutral position indicator lamp 9 is connected to the connection point with b so as to be turned on when power is supplied when the neutral position detection switch 6 is closed. In addition, an ignition relay 1 is connected to the power line connecting the start contact 3b of the ignition switch 3 and the starter motor device 140.
3 relay contact 13b is inserted, and relay contact 1
3b is closed, the main relay in the starter starter device 14 is activated, and power is accordingly supplied to the starter motor in the starter motor device 14 through the starter motors 1 to 15 connected to the battery 1. It is now possible to do so.

Furthermore, at the connection point between the fuse 4b and the neutral position detection switch 6, a reverse position display lamp 10 and reverse lights 11a, llb are connected via a reverse position detection switch 7 that is closed when the shift lever is in the reverse position. are connected in parallel, and in addition, another electrical load 16 is also connected to the same connection point.

On the other hand, two input terminals of NOR gate G are connected to both ends of the parking position detection switch 5, and two input terminals of NOR gate G are connected to both ends of the neutral position detection switch 6. The output terminals of are connected to the input terminals of OR gate q, respectively, and the output terminal of 01t gate G is connected to ANJJ.
It is connected to one input terminal of gate G4. The other input terminal of the ANI) gate G is connected to a line connecting the star) 9 point 3b of the ignition switch 3 and the starter motor device 14 via the relay contact 13b, and the output terminal of the AND gate G4 is Starter γ-,
A signal is connected to an alarm device 17 which is connected to V''IL; 15 and supplied with power, and the alarm device 17 is triggered by the output signal of the ANL) gate G4.

Next, the effect will be explained.

When the shift lever of the automatic transmission is set to the parking position or the neutral position, the parking position detection switch 5 or bi-tral position detection switch 6 is activated in conjunction with the shift lever operation.
is in the closed state, and when the ignition switch 3 is set to the ON contact 3h, electricity is supplied via the fuse 4a, the parking position detection switch 5, or the heater 4b, and the neutral position detection switch 6, and the parking position indicator lamp 8 or the neutral position detection switch is energized. The indicator lamp 9 lights up, and at the same time, the relay coil 13a of the relay 13 is energized and energized via the diode 12a or the diode 12b, and the relay contact 13b is closed. here.

When the ignition switch 3 is switched to the start contact 3b, power is supplied to the starter motor of the starter motor device 14 through the starter T-7""t1215, and the starter motor starts, similar to the conventional starter motor drive circuit shown in FIG. Start.

On the other hand, if, for example, the neutral position indicator lamp 9 is short-circuited, when the shift lever is placed in the neutral position and the ignition switch 3 is turned on to the on contact 3a, an overcurrent flows through the fuse 4b and the fuse 4b is blown. Then, since the parking position detection switch 5 is open, one of the NOROR gate G8 outputs is at H level and the other is at L level, and the NOROR gate G3 output is at L level. As input fuse 4b is blown, both inputs are at L level and NOOR gate G
3 output becomes H level, and AN through OR gate G3.
I) One input of gate q4 becomes H level and ANI
) Gate G4 enters the permissive state.

Now, turn the ignition switch 3 to the start contact 3b.
When switching to , the other inputs of ANI) gate G become H level, and the output of ANI) G4 becomes H level. This H level signal triggers the alarm device 17, and the alarm device 17 outputs a buzzer and a buzzer. A lamp or similar device will issue a warning that the fuse has blown. in this case,
Since the fuse 4b is blown, if the shift lever remains in the neutral position, the relay coil 13a of the ignition relay 13 will not open and the starter motor cannot be driven, but if the shift lever is moved to the parking position, the relay The coil 13a is now coupled, making it possible to drive the starter motor.

On the other hand, if the fuse 4a is blown because the shift lever is set to the parking position and the ignition switch 3 is set to the on contact 3a while the parking position indicator lamp 8 is short-circuited, then the case where the fuse 4a is blown is opposite to the case where the fuse 4b is blown. JR Gate G
The output of the NOR gate voltage becomes H level, and the output of the NOR gate voltage becomes L level. When the output of becomes H level and the ignition switch 3 is switched to the start contact 3b, the alarm device 17 is activated in the same way as when the fuse 4b is blown.
A warning will be issued. In this case, the starter motor cannot be driven if the shift lever remains in the parking position, but if the shift lever is moved to the neutral position, the relay coil 13a is energized and the starter motor can be driven. become.

In addition, when the starter motor is started again with the power supply 4b cut off due to a short circuit in the reverse position indicator lamp 10° reverse light 11a, llb or a failure of the electric load 16 while driving the vehicle, an overcurrent flows. , First, put the shift lever in the neutral position and start the ignition switch 3. When you perform the starting operation by switching to the contact point 3b, an alarm will be issued from the alarm device 17 in the same way as when the neutral position indicator lamp 9 is shorted and the engine 4b is cut out. is issued and the starter motor cannot be driven if the shift lever remains in the neutral position, but it becomes possible to drive the starter motor if the shift lever is moved to the parking position. Next, when you move the shift lever to the parking position and start the ignition switch 3,
Since the fuse 4a is not blown, the relay coil 13a becomes energized, the starter motor in the starter motor device i14 starts, and at the same time, the inputs of both NOR gates become H level, and the NOR gate 1. The output of N(JR gate q.

One input is 1 (level), the other is L level, and N
(The output of JIL gate G becomes H level, and the output of gate 014 becomes H level, so the output of ANI) gate q4 becomes H level when the ignition switch 3 is started, and the alarm device 17 issues an alarm. Emitted.

In the present embodiment, a circuit for indicating vehicle backward following the reverse position detection switch 7 and other electrical loads 16 are connected to the connection point between the fuse 4b and the neutral position detection switch 6. The present invention is not limited to this, and it may be connected to the connection point between the fuse 4a and the parking position detection switch 5, or may be connected separately to both connection points.

As mentioned in 5 above, in this embodiment, if the fuse 4b is blown, the shift lever can be moved to the parking position and the starter motor can be started, and if the fuse 4a is blown, the shift lever can be moved to the neutral position. Since the starter motor can be started by using the fuse 4a or fuse 4b, the occurrence of the starter motor being unable to start is significantly reduced compared to the conventional starter motor drive circuit.
Since a warning is issued when the fuse is blown, even an ordinary driver can easily determine that the fuse has blown, and repairs can be made immediately, thereby preventing failures that would result in the starter motor not being able to start.

As explained above, according to the present invention, the configuration is
An energizing circuit is formed to the ignition relay via a shift position detection switch that closes when the shift lever of the automatic transmission is operated to the parking position or neutral position, and the starter is activated by activation of the ignition relay by the start operation of the ignition switch. In the starter motor drive circuit that drives the motor, a fuse is individually provided in each of the energizing circuits of the shift position detection switches at the parking position and the neutral position, and an alarm is issued when at least one of the fuses is blown. As a result, it is possible to prevent the starter motor from being unable to start due to a disconnection of the fuse provided in the energizing circuit to the shift position detection switch, and it is possible to prevent the inability to start the engine due to the starter motor not starting.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a starter motor drive circuit of a conventional automatic transmission-equipped vehicle, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. 1... Battery a 3... Ignition switch 3a... On contact 3b... Start contact 4a, 4b... Fuse 5...
Parking position detection switch 6...Neutral position detection switch 7...Reverse position detection switch 8...Parking position display lamp 9...Neutral position display lamp

Claims (1)

[Scope of Claims] An energizing circuit is formed to an ignition relay via a shift position detection switch that closes when a shift lever of an automatic transmission is operated to a parking position or a neutral position, and the ignition relay is activated by a starting operation of the ignition switch. In the starter motor drive circuit of a vehicle equipped with an automatic transmission that drives the starter motor by the operation of 1. A starter motor drive circuit for a vehicle with an automatic transmission, comprising an alarm means for issuing an alarm when at least one of the means interrupts a current-carrying circuit.