JPH04318238A - Internal combustion engine control device - Google Patents

Abstract

PURPOSE:To prevent a system down at the time of insufficient power generation by cutting off a drive signal relating to an actuator to stop rotation of an internal combustion engine when voltage of a capacitor is decreased to predetermined voltage or less in a condition that a speed of the internal combustion engine is low generated further with low generating power of a generator. CONSTITUTION:In a control circuit 6, various actuators 7 of a fuel pump and an ignition coil or the like are driven based on various operational condition detection signals of voltage V of a capacitor, speed D of an internal combustion engine and the like. In a microcomputer 62 in the control circuit 6, a predetermined drive signal A is output to the actuator 7 and also outputting a predetermined control signal C to a changeover switch 64 to cut off the drive signal A. Here in the microcomputer 62, first whether or not the engine speed D is a predetermined value or less is decided. Next, when the engine speed is the predetermined value or less, whether or not the capacitor voltage V is a predetermined value or less is decided. Successively, when the capacitor voltage is the predetermined value or less, the drive signal A is cut off to stop rotation of the internal combustion engine.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal combustion engine control device used in automobiles, outboard motors, etc., and more particularly to an internal combustion engine control device that prevents system failure due to overdischarge of a capacitor when power generation capacity is reduced.

0002

2. Description of the Related Art FIG. 3 is a block diagram showing a general internal combustion engine control device. In the figure, 1 is a generator that rotates synchronously with the rotation of the internal combustion engine and outputs an AC voltage, and 2 is a generator 1.
3 is a condenser that stores the output power from the generator 1; 4 is a rotation detector provided on the camshaft or crankshaft of the internal combustion engine to detect the rotation speed D; 5 6 is a voltage detector that detects the voltage V output from the capacitor 3; 6 is a control circuit that operates control parameters of the internal combustion engine based on various signals including the rotation speed D and the voltage V; 7 is a drive from the control circuit 6; This is an actuator driven by signal A.

A crank angle reference position signal synchronized with the rotation of the internal combustion engine is generated from the rotation detector 4 and is input to the control circuit 6. Further, various signals indicating the operating state of the internal combustion engine are inputted to the control circuit 6 from various detectors (not shown). Further, the actuator 7 includes not only a fuel pump, an ignition coil, a throttle, etc., but also various driving elements such as an electromagnetic suspension and a starting motor.

Next, the operation of the general internal combustion engine control device shown in FIG. 3 will be explained. The control circuit 6 has a voltage V,
The actuator 7 (for example,
(fuel pump and ignition coil), and calculates and controls fuel injection timing and ignition timing. Thereby, the internal combustion engine is optimally controlled to achieve the desired rotation speed.

At this time, the generator 1 is rotated by the operation of the internal combustion engine, charges the capacitor 3, and drives the control circuit 6 either directly or via the capacitor 3. The control circuit 6 outputs a drive signal A to the actuator 7 based on the rotation speed D, the voltage V, and various signals indicating various operating conditions. For example, when the voltage V of the capacitor 3 is low,
The ignition voltage is ensured by lengthening the energization time of the drive signal A to the ignition coil (not shown).

[0006] Normally, when the rotation speed D is below a predetermined rotation speed, such as when idling or trolling an outboard motor, the output current of the generator 1 may decrease and fall below the required current consumption of the entire system. . In this case, the current shortage to the system is compensated for by the power supply from the power storage device 3. However, if this state continues for a long time, the current shortage will exceed the power supply capacity of the capacitor 3, making it impossible to obtain the specified voltage from the capacitor 3, and eventually the operation of the system including the control circuit 6 will be affected. everything stops.

[0007]

[Problem to be Solved by the Invention] As described above, the conventional internal combustion engine control device does not take effective measures against the drop in output voltage of the capacitor 3 when the rotation speed drops, so there is a risk that the system will go down. There was a problem.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an internal combustion engine control device that prevents system failure when power generation is insufficient below a predetermined rotation speed.

[0009]

[Means for Solving the Problems] An internal combustion engine control device according to the present invention includes a rotation speed determination means for determining whether or not the rotation speed is below a predetermined rotation speed; The control circuit is provided with a voltage determining means for determining whether the voltage of the capacitor is below a predetermined voltage, and a rotation stopping means for cutting off the drive signal and stopping the rotation of the internal combustion engine when the voltage is below the predetermined voltage. It is something that

0010

According to the present invention, when the voltage of the capacitor falls below a predetermined voltage when the rotational speed is low and the generating capacity is low, the drive signal to the actuator is cut off to stop the rotation of the internal combustion engine.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control circuit according to an embodiment of the present invention, and 7, D, V, and A are the same as described above. Further, the configuration of the entire device is as shown in FIG. 3.

In FIG. 1, 61 indicates the rotation speed D and the voltage V.
and an input interface for receiving various signals including other operating conditions; 62 is a microcomputer for receiving various signals via the input interface 61; 63 is for sending the drive signal A generated from the microcomputer 62 to the actuator 7; The output interface 64 is an open/close switch that cuts off the drive signal A in response to the control signal C from the microcomputer 62.

Microcomputer 62 in control circuit 6
includes a rotation speed determination means for determining whether the rotation speed D is below a predetermined rotation speed, and a rotation speed determination means for determining whether the rotation speed D is below the predetermined rotation speed, and whether the voltage V of the capacitor 3 is below the predetermined voltage. The internal combustion engine includes a voltage determining means for making a determination, and a rotation stopping means for cutting off the drive signal A and stopping the rotation of the internal combustion engine when the voltage V is less than a predetermined voltage.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be explained with reference to the flowchart of FIG. 2 and FIG. 3. FIG. 2 shows the processing procedure of the microcomputer 62. First, the rotation speed D of the internal combustion engine is detected (step S1), and it is determined whether the rotation speed is below a predetermined rotation speed corresponding to idling or trolling (
Step S2).

[0015] If the rotational speed D is below the predetermined rotational speed, it is recognized that the vehicle is not in normal driving mode and the power generation capacity is low. Subsequently, the voltage V of the capacitor 3 (see FIG. 3) is detected (step S3), and it is determined whether the voltage is equal to or lower than a predetermined voltage (step S4).

During normal driving, it is determined in step S2 that the rotation speed D is equal to or higher than a predetermined rotation speed, and
If the remaining amount of power stored in the power storage device 3 is sufficient, it is determined in step S4 that the voltage V is equal to or higher than the predetermined voltage. Therefore, the open/close switch 64 is kept conductive, and the drive signal A calculated by the microcomputer 62 is applied to the actuator 7 as it is. For example, depending on the drive signal A, the ignition coil energization time, the fuel injection amount,
Alternatively, the air flow rate of the throttle, etc. is adjusted.

On the other hand, if it is determined in step S4 that the voltage V is less than the predetermined voltage, it is recognized that the remaining amount of stored electricity in the capacitor 3 is decreasing, so the microcomputer 62 A control signal C for cutting off the drive signal A is output. As a result, the open/close switch 64 is opened and the drive signal A is cut off, so the actuator 7 stops and the rotation of the internal combustion engine stops (
Step S5).

For example, the actuator 7 to be stopped
If it is a fuel pump, fuel injection will not be performed, and
In the case of the ignition coil, no discharge occurs, and the internal combustion engine stops rotating. As a result, the driver starts the internal combustion engine again, and the initial rotation at this time charges the capacitor 3 and restores the voltage V. Therefore,
Over-discharging of the power storage device 3 can be prevented, and the system including the control circuit 6 can be prevented from going down.

[0019]

Effects of the Invention As described above, according to the present invention, there is provided a rotation speed determination means for determining whether the rotation speed is below a predetermined rotation speed, and the voltage of the capacitor is Voltage determining means for determining whether the voltage is below a predetermined voltage;
The control circuit is equipped with a rotation stop means that cuts off the drive signal and stops the rotation of the internal combustion engine when the voltage is below a predetermined voltage, so even if the power generation capacity decreases and the capacitor voltage falls below the predetermined voltage, the system will continue to operate. This has the effect of providing an internal combustion engine control device that can prevent downtime.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a control circuit according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing procedure of the microcomputer in FIG. 1;

FIG. 3 is a block diagram showing a general internal combustion engine control device.

[Explanation of symbols]

1 Generator 3 Condenser 4 Rotation detector 5 Voltage detector 6 Control circuit 7 Actuator 62 Microcomputer 64 Open/close switch D Rotation speed V Voltage A Drive signal C Control signal S2 Step for determining rotation speed S4 Step for determining voltage

Claims (1)

[Claims] 1. A generator that rotates in synchronization with an internal combustion engine, a capacitor that stores output power of the generator, a rotation detector that detects the rotational speed of the internal combustion engine, and a voltage that detects the voltage of the capacitor. An internal combustion engine control device comprising: a detector; a control circuit that operates control parameters of the internal combustion engine based on various signals including the rotation speed and the voltage; and an actuator driven by a drive signal from the control circuit. In the control circuit, the control circuit includes a rotation speed determining means for determining whether or not the rotation speed is a predetermined rotation speed or less, and a rotation speed determining means for determining whether the rotation speed is a predetermined rotation speed or less, and a rotation speed determining means for determining whether the rotation speed is a predetermined rotation speed or less and a rotation speed determining means for determining whether the rotation speed is a predetermined rotation speed or less. An internal combustion engine control device comprising: voltage determining means for determining whether the voltage is lower than a predetermined voltage; and rotation stopping means for stopping the rotation of the internal combustion engine by cutting off the drive signal when the voltage is equal to or lower than a predetermined voltage.