Patent ID: 9322354
Filing Date: 2016-04-26
CPC Classification: F02D

Claim Text:
1. An in-vehicle engine control device comprising: a solenoid valve driving control circuit unit for a plurality of electromagnetic coils for driving solenoid valves in order to sequentially drive the solenoid valves for fuel injection provided in respective cylinders of a multi-cylinder engine; a boosting circuit unit that generates a boosted high voltage for performing rapid excitation on the electromagnetic coils; an arithmetic and control circuit unit that has a microprocessor as a main constituent element; and an injection control circuit unit that performs relay between the microprocessor and the solenoid valve driving control circuit unit, wherein the arithmetic and control circuit unit includes the microprocessor determines generation moments of valve opening command signals INJn for the electromagnetic coils and a valve opening command generation period Tn on the basis of signal voltages of at least some of an air flow sensor, an accelerator position sensor, and a fuel pressure sensor included in a low-speed analog sensor group, which are input to the multi-channel A/D converter, and operations of a crank angle sensor and an engine speed sensor of an opening and closing sensor group, the boosting circuit unit includes a divided voltage of the voltage across both ends of the high-voltage capacitor is input to the arithmetic and control circuit unit as a boosted detection voltage Vx, an analog signal voltage proportional to the inductive element current Ix and the boosted detection voltage Vx is input to the high-speed A/D converter, and data which is digitally converted by the high-speed A/D converter is stored in a current present value register and a voltage present value register, the boosting control circuit portion includes the logical circuit portion compares a value of a target higher-side current Ix the logical circuit portion compares a value of a target higher-side voltage Vx the arithmetic and control circuit unit is divided into a data processing function of setting numerical values of the target higher-side current Ix