Vehicle-mounted engine controller

Abstract

The system has voltage gain circuit (160A) with loading diodes (162a,162b) that are connected in series to the inductors (161a,161b). A high voltage capacitor (163) is charged by current flowing through the inductors and diodes. The opening / locking control circuit (170) is provided with low-voltage opening / locking unit (171) which is connected between vehicle accumulator (101) and electromagnetic coils (107a-107d). The voltage gain control circuits are charged alternately so that overlapping of the peak values of exciting currents of inductors is avoided. The high voltage opening / locking unit (172) is connected between high voltage capacitor and electromagnetic coils. The selective opening / locking units are connected in series with the electromagnetic coils. The line timings and spacer periods of the selective opening / locking units are adjusted by a microprocessor (110). The voltage gain control circuits are charged alternatively so that overlapping of the peak values of exciting currents of inductors is avoided. The charging timing of the voltage gain control circuits is set in the timing circuits, based on predetermined time. The back current prevention diode (173) is connected in series with low-voltage opening / locking apparatus.

Description

technical field [0001] The present invention relates to a vehicle-mounted engine control device, in order to drive a solenoid valve for fuel injection of an internal combustion engine at a high speed, a high voltage obtained after being boosted by a vehicle-mounted battery is instantly supplied to an electromagnetic coil for driving the solenoid valve, and the voltage of the vehicle-mounted battery is used to perform the operation. The valve opening keeps the control, especially related to the structure of the improved booster circuit. Background technique [0002] Fuel injection control that sequentially selects and sets the valve opening timing and valve opening period by a microprocessor that operates based on a crank angle sensor for driving a plurality of solenoid coils for driving a fuel injection solenoid valve provided in each cylinder of a multi-cylinder engine In the device, various improvements have been made to the booster circuit for rapid valve opening by overv...

AI Technical Summary

Problems solved by technology

[0008] The control device of the fuel injection valve disclosed in Patent Document 1 has the following problems: when the engine rotates at a high speed, it is necessary to perform a step-up conversion operation at a high frequency, and the inductive element mounted on the electronic board and the excitation current of the inductive element are controlled. The heat generated in the intermittently driven switching element is too large locally, and when the high-frequency step-up conversion operation is not required during low-speed rotation, the excitation current of the induction element is also large, and the overcurrent burden of the battery when the engine is cold started larger

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