JPH0619826Y2 - Engine controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an engine control device, and in particular, to an abnormal signal of a sensor provided in each detection unit until the engine is normally started when the engine is started. The present invention relates to an engine control device configured to turn on / off power supply to a dead circuit and power supply to a stop circuit for making the engine insensitive according to start / stop of an engine switch.

[Conventional technology]

In order to prevent the occurrence of conditions such as insufficient hydraulic pressure of the engine and insufficient hydraulic pressure that cause abnormal operation of the engine, it is necessary to provide a sensor in each device and stop the engine when an abnormal signal is output from the sensor. ， We are trying to protect the engine.

By the way, the oil pressure, water pressure, etc. of the engine are in a predetermined state after the engine has been started for a certain period of time, and an abnormal signal notifying the abnormality is output from the sensor until the certain period of time elapses. Therefore, these sensors are prevented from operating for a certain period after the engine is started.

[Problems to be solved by the invention]

However, in the conventional engine control device, it is necessary to prevent the engine from being stopped by an abnormal signal from the sensor for a certain period of time after the engine is started, for example, an abnormal signal generated during the transition period from the engine start to a steady operation state such as insufficient hydraulic pressure. Although a dead circuit is provided for this purpose, the power supply for the dead circuit and the stop circuit at the time of abnormality and the power supply for starting the starter are controlled by separate power supplies. Therefore, a separate battery had to be prepared, and the control system had to be turned off when the engine was started, and turned on when the engine entered steady operation. This switching is troublesome, and forgetting to switch has occurred, so that an abnormality in the engine cannot be detected or a battery overdischarge occurs.

The present invention is intended to solve the above-mentioned drawbacks, and supplies power to a dead circuit or a stop circuit that makes an abnormal signal of a sensor provided in each detection unit insensitive until the engine is normally started. It is an object of the present invention to provide an engine control device in which the power is supplied to the starter and the power supply is turned on / off in response to the start / stop of the engine switch.

[Means for solving problems]

Therefore, the engine control device of the present invention includes an engine switch having a first state for keeping the engine in a starting state, a second state for keeping the engine in a stopped state, and a third state for keeping the engine in an operating state, A starter that starts the engine in response to the state 1; a battery that supplies power to the starter and a starter drive circuit for the starter; and an abnormal state during the steady operation of the engine under the third state And a stop circuit for stopping the engine when it is desired to stop the engine under the second condition, and for maintaining power supply to the stop circuit under the first condition and the third condition. In an engine control device provided with a self-holding contact circuit, power is supplied from the battery via the contact of the self-holding contact circuit, and the engine A desensitizing circuit is provided to desensitize an abnormal signal of a sensor provided in each detecting unit until the engine is normally started during operation, and under the first condition, through the self-holding type contact circuit, Power is supplied to the dead circuit and power to the stop circuit, power supply to the self-holding contact circuit is stopped under the third state, and stop under the second state. It is characterized in that the operating position of the engine switch and the first to third states are made to correspond to each other so as to operate the circuit. An embodiment of the present invention will be described below with reference to the drawings.

〔Example〕

FIG. 1 shows a configuration of an embodiment of an engine control device according to the present invention, and FIGS. 2 (I), (II) and (III) show time charts for explaining the operation in each operating state.

In FIG. 1, reference numeral 1 is a starter, 2 is a battery, and 3
Is a starter drive circuit, 4 is an engine switch, 5 is a self-holding contact circuit, 6 is a dead circuit, 7 is a stop circuit, 8 is a comparator, 9 to 12 are transistors, 13 is a thyristor, 14 to 16 are diodes, Reference numeral 17-1 is a set relay coil, 17-2 is a reset relay coil, 17a and 17b are relay contacts, 18 to 29 are resistors, 30 and 31 are capacitors, and 32 is an abnormal signal contact.

The relay contacts 17a and 17b are in the reset (R) state with the solid line position and in the set (S) state with the broken line position.

The dead circuit 6 and the stop circuit 7 are adapted to be supplied with power from the battery 2 through a relay contact 17a in a self-holding type contact circuit 5 controlled by the engine switch 4. That is, as will be described in detail later, when the engine switch 4 is turned on, the relay contact 17a is closed, the power of the battery 2 is supplied to the dead circuit 6 and the stop circuit 7, and when the engine switch 4 is turned off, the relay contact 17a is turned on. Opening, the power supply of the battery 2 to the dead circuit 6 and the stop circuit 7 is cut off.

The operation of FIG. 1 will be described below for each operation mode. The contact relationships shown in FIG. 1 are all in a stopped state.

(I) Normal operation Specifically, as shown in FIG. 2 (I), in the case of engine start, normal operation, and engine stop by the engine switch 4, the engine switch 4 is manually turned down. As a result, a base current flows through the transistor 10 and the transistor 10 is turned on. Therefore, the transistor 9 is also turned on, a starting current flows through the transistor 9 to the starter 1, and the starter 1 is started.

On the other hand, when the engine switch 4 is turned on, the set relay coil 17-1 is energized, and its relay contact 17a
Is in the S position shown by the broken line, that is, closed, and the relay contact 17b is in the S position shown by the broken line, that is, open. These relay contacts 17a and 17b are used for the set relay coil 17-1 or the reset relay coil 1
7-2 are operated respectively by the energization of 7-2, and the set relay coil 17-1 or the reset relay coil 1
Even if 7-2 is deenergized, its relay contacts 17a, 17b
Holds the state at that time. It is a so-called latching relay contact.

When the relay contact 17b is opened, the relay contact 17 is opened.
The ground state of the magnet ignition circuit connected to b is turned off, and the ignition circuit of the engine is activated.

Further, the power of the battery 2 is supplied to the dead circuit 6 and the stop circuit 7 by closing the relay contact 17a. At this time, since the transistor 10 is turned on, the potential at the point A at the inverting input terminal of the comparator 8 becomes
The voltage at the point B at the non-inverting input terminal of the comparator 8 changes the voltage of the battery 2 to the resistances 23 and 2
It is a voltage proportionally divided by the ratio of 4. Since the resistors 23 and 24 are set so that the potential at the point B becomes higher than the potential at the point A, the output of the comparator 8 becomes "H". As a result, the transistor 11 is turned on, and the point C on the collector side of the transistor 11 becomes almost the ground voltage. Therefore, the abnormality signal contact 32 for notifying an abnormality such as insufficient hydraulic pressure or insufficient hydraulic pressure that occurs until the engine reaches a predetermined rotation speed.
The thyristor 13 cannot be turned on even if it is opened and opened. That is, the dead circuit 6 operates to make the operation of the thyristor 13 insensitive.

When the engine starts, the engine switch 4 is manually
Is returned to neutral from the ON side. This turns off the transistor 10, turning on the resistor 21 and the diode 16
A charging current for charging the capacitor 30 flows via the resistor 22 and the resistor 22. After a certain period of time determined by the time constant of the resistor 22 and the capacitor 30, the potential at the point A at the inverting input end of the comparator 8 becomes higher than the potential at the point B at the specific inverting input end, and the comparator 8 Output is inverted from "H" to "L". As a result, the transistor 11 is turned off, and the voltage of the battery 2 is applied to the point C on the collector side of the transistor 11. That is, the operation of the dead circuit 6 is eliminated, and the engine enters the normal operating state. At this time, the abnormal signal contact 32 is already open.

Next, when the engine switch 4 is manually turned off, a gate current flows from the battery 2 to the thyristor 13 via the resistors 28 and 29, and the thyristor 13 is turned on. As a result, the reset relay coil 17-2 is energized, the relay contact 17b is opened, the magnet ignition circuit connected to the relay contact 17b is grounded, and the engine is stopped. Further, the relay contact 17a is opened, so that the power supply of the battery 2 to the dead circuit 6 and the stop circuit 7 is cut off. That is, the state returns to the contact state shown in FIG. The electric charge charged in the capacitor 30 is discharged through the resistor 20, and the next operation is started from the zero state.

(II) When the hydraulic pressure is abnormal That is, as shown in Fig. 2 (II), when the engine starts, but the hydraulic pressure does not rise and the abnormal signal contact 32 does not open, the engine is manually operated as in the normal operation of (I).・ While the switch 4 is turned to the on side, the engine starts normally. The operation is as described in (I) above.
However, even if the engine switch 4 is manually neutralized, the abnormal signal contact 32 remains closed, so that the dead circuit 6 does not operate after a certain time T due to the time constant of the resistor 22 and the capacitor 30. Even if is eliminated, the abnormal signal contact 32 is closed, so that the thyristor 13 is turned off and the reset relay coil 17-2 is energized. This makes relay contact 1
7b is opened, and the relay contact 17b is opened as described above.
The ground of the magnet ignition circuit connected to is lost and the engine is stopped.

(III) When the engine is stopped due to lack of gas after normal operation, that is, when the engine is in normal operation as shown in Fig. 2 (III) and the engine is stopped due to so-called lack of fuel, etc. During normal operation As described in (I), the relay contact 17a is closed, the dead circuit 6 and the stop circuit 7 are supplied with the power of the battery 2, and the relay contact 17b is open. Then, the transistor 11 in the dead circuit 6 is off, and the power source voltage of the battery 2 is applied to the point C on the collector side of the transistor 12.

If gas shortage or the like occurs under such a condition, the engine speed will decrease, for example, hydraulic pressure will become insufficient, and the abnormality signal contact 32 will close. As a result, the transistor 12 is turned on and the thyristor 13 is turned on. Therefore, the reset relay coil 17-2 is energized, and the relay contacts 17a and 17b are opened and closed, respectively. By closing the relay contact 17b, the magnet ignition circuit connected to the relay contact 17b is grounded. Also, the power supply to the dead circuit 6 and the stop circuit 7 is cut off by opening the relay contact 17a. Therefore, the thyristor 13 is turned off.

In Fig. 2, (a) shows the start of cranking,
In (b), the engine starts and the charging of the capacitor 30 starts, and (c) in the abnormal signal contact 3 when the hydraulic pressure etc. exceeds the specified value.
2 shows the transition to open, (d) the reversal of the comparator 8, (e) the engine stop start, (f) the engine stop and the timing when the oil pressure etc. becomes zero and the abnormality signal contact 32 is closed. There is.

[Effect of device]

As described above, according to the present invention, it is possible to control the cutoff of the power supply corresponding to the engine switch and use the same battery for driving the starter as the power supply. Therefore, there is no need to forget to switch over for battery over-discharge or abnormal signal detection as in the conventional system that was configured with a separate power supply.
The protection of the engine system is enhanced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of an engine control device according to the present invention, and FIGS. 2 (I), (II), and (III) are times for explaining the operation in each operating state. The chart is shown. In the figure, 1 is a starter, 2 is a battery, 3 is a starter drive circuit, 4 is an engine switch, 5 is a self-holding contact circuit, 6 is a dead circuit, 7 is a stop circuit, 8 is a comparator, 9 to 12 are Transistor, 13 is a thyristor, 14 to 16 are diodes, 17-1 is a set relay coil, 17-2 is a reset relay coil, 17a, 1
7b is a relay contact, 18 to 29 are resistors, 30, 31
Is a capacitor, and 32 is an abnormal signal contact.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F02P 11/00 A 11/04 302 A

Claims (1)

[Scope of utility model registration request] 1. An engine switch having a first state for keeping an engine in a starting state, a second state for keeping an engine in a stopped state, and a third state for keeping an engine in an operating state, and the first state. The starter for starting the engine in response to the above, the battery for supplying power to the starter and the starter drive circuit for the starter, when an abnormal state occurs during the steady operation of the engine under the third condition, and When it is desired to stop the engine under the condition of No. 2, a stop circuit for stopping the engine, and a self-holding type for maintaining power supply to the stop circuit under the first condition and the third condition. In the engine control device including a contact circuit, power is supplied from the battery via the contact of the self-holding contact circuit, and the engine is positive when starting. A dead circuit for making the abnormal signal of the sensor insensitive is provided in each detection unit until it is activated, and power is supplied to the dead circuit via the self-holding contact circuit under the first condition. Power supply to the stop circuit is performed, power supply to the self-holding contact circuit is stopped under the third state, and the stop circuit is operated under the second state. The engine control device is characterized in that the operating position of the engine switch is associated with the first state or the third state.