JPS60153425A - Controller of internal combustion engine with mechanical supercharger - Google Patents

Abstract

PURPOSE:To prevent a failure of an engine body by disengaging a solenoic clutch when any trouble of the engine is detected, so as to interrupt supercharging function. CONSTITUTION:An air cleaner 4, an air chrometer 5, a throttle valve 6, a supercharger 7, a serge tank 8 and a fuel injection valve 9 are arranged in order in an intake pipe 2. The supercharger 7 is a root pump and is provided with a solenoid clutch 11, which is connected to a crank pulley 13 with a belt 12. There are provided an engine speed sensor, the KCS sensor of a knock control system, a catalyst temperature sensor, a sensor for oxygen concentration inside exhaust gas, a hydraulic sensor, a cooling water temperature sensor, a car speed sensor and so forth. When the detected values of those sensors exceed respective predetermined values, a trouble signal is provided to disengage the solenoid clutch 11.

Description

[Detailed description of the invention] Technical field The present invention relates to a control device for an internal combustion engine with a mechanical supercharger.

BACKGROUND OF THE INVENTION Internal combustion engines with a mechanical supercharger connected to the engine crankshaft via an electromagnetic clutch are known. Generally, the electromagnetic clutch is disconnected when the engine load is relatively low and continued when the engine load is relatively high (1). In such an internal combustion engine, when the electromagnetic clutch continues, the engine body and the supercharger are directly connected mechanically, and if an abnormality occurs in the engine in such a state, the abnormality will be caused by supercharging. The situation will be exacerbated, and it may even progress to failure of the engine itself.

OBJECTS OF THE INVENTION An object of the present invention is to prevent failure of the engine body by stopping supercharging when an abnormality in the engine is detected.

Structure of the Invention According to the present invention, in an internal combustion engine equipped with a mechanical supercharger connected to an engine output shaft via an electromagnetic clutch, the electromagnetic clutch engagement control device is configured to engage and engage the electromagnetic clutch according to the engine load. A control device for an internal combustion engine with a mechanical supercharger is provided, which includes a main control circuit means and a sub-control circuit means for detecting an abnormal state of the engine and disconnecting an electromagnetic clutch in the event of an abnormality.

Description of the embodiment (2) In Fig. 1, the engine body 1 has an intake pipe 2 and an exhaust pipe 3.
is connected. An air cleaner 4, an air flow meter 5, thrower valves 1 to 6, a supercharger 7, a surge tank 8, and a fuel injection valve 9 are arranged in this order in the intake pipe 2. The supercharger 7 utilizes a roots pump, and an electromagnetic clutch 11 is attached to the support shaft of one rotor 10, and the electromagnetic clutch 11 is connected to a crank pulley 13 by a heald 12.

Therefore, when the electromagnetic clutch 11 is continued, the supercharger 7 is interlocked with the crankshaft, and when the electromagnetic clutch 11 is disconnected, the supercharger 7 is disconnected from the crankshaft, and the rotor 10 is connected to the intake air. The engine rotates at idle. The electromagnetic clutch 11 is turned on and off by sending a signal to the relay 14, and the signal is sent from the control device 15.

A bypass pipe 16 is connected to the intake pipe 2 by bypassing the throttle valve 2 and the supercharger 7, an idle speed control valve 17 and a check valve 18 are attached to the bypass pipe 16, and the control device 15 consists of a digital computer. , air flow meter 5 and (3) Signals from the rotor position sensor, engine speed, cooling water temperature, etc., and signals from various sensors as shown in Figure 2 are input, and the fuel injection valve is rotated at 9° idle.・−
A control signal is output to the control valve 17 and the relay 14. Control of the fuel injection valve 9 is performed by known means.

A control signal to the relay 14 for operating the electromagnetic clutch 11 is sent from the main control circuit means (Z) 30 and the abnormality detection sub-control circuit means 31, which are input to the AND circuit 20. The main control circuit means 30 can, for example, turn the solenoid valve 11 on and off at a predetermined throttle opening based on the output of a throttle position sensor. Or it can also be controlled according to the engine speed. The sub-control circuit means 31 includes an engine speed sensor 21, a knock control system KCS sensor 22, and a catalyst temperature sensor 2.
3. Oxygen concentration sensor 24 in exhaust gas, oil pressure sensor 25
, a cooling water temperature sensor 26, a vehicle speed sensor 27, and other abnormality detection sensors, and when the detection value of each of these sensors exceeds a predetermined value (4), it outputs 1 as an abnormality signal, or the KCS sensor 22
In the case of , outputs 1 when there is a failure, and 02 sensor 2
4 outputs 1 when its output deteriorates. In other cases, 0 is output. All of these signals are sent to the OR circuit 3.
Therefore, if one of the signals is detected as 1, the OR circuit 32 outputs 1. This signal is inverted by an inverter 33 and input to the AND circuit 20. Therefore, when all the outputs of the abnormality detection sensors are 0, which indicates no abnormality, the output of the OR circuit 32 becomes 0, and the output of the inverter 33 becomes 1, which are input to the AND circuit 20. Therefore, in a state where no abnormality is detected, when the electromagnetic clutch continuation signal of the main control circuit means 30 becomes 1, the AN
D circuit 20 outputs 1. However, if any of the abnormality detection sensors 21 to 27 determines that there is an abnormality and detects 1, the OR circuit 32 months, the inverter 33 becomes O, and the AN
The output of the D circuit 20 becomes O regardless of the signal from the main control circuit means 30, and the electromagnetic club 1. Chi 11 is broken. Therefore, the engine is operated at empty (5) air, equivalent to non-supercharging, to reduce the burden of abnormal conditions and prevent the engine from failing. Of course, such an abnormality is alerted to the driver, so that the driver can take appropriate measures.

As described in detail, according to the present invention, engine failure can be prevented even if an abnormality occurs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an internal combustion engine according to the present invention, and FIG. 2 is a diagram showing essential parts of an electromagnetic clutch control device. 7...Supercharger, 11...Electromagnetic clutch, 15...
Control device, 30... Main control circuit means, 31... Sub control circuit means. (6)

Claims (1)

[Claims] In an internal combustion engine equipped with a mechanical supercharger connected to an engine output shaft via an electromagnetic clutch, the electromagnetic flanch intermittent control device includes a main control circuit means for disengaging and disengaging the electromagnetic clutch according to the engine load; 1. A control device for an internal combustion engine with a mechanical supercharger, comprising sub-control circuit means for detecting an abnormal state and disconnecting an electromagnetic clutch in the event of an abnormality.