Hitachi, Ltd.

Hitachi Car Engineering Co., Ltd.

Hitachi Automotive Engineering Co., Ltd.

Hitachi, Ltd. and Hitachi Car Engineering Co., Ltd.

Asahiko Otani

Hiroyuki Yamada

Takashi Okamoto

Kozo Katogi

Mitsuru Nagase

Kosaku Shimada

Masayoshi Hayasaka

Tomoharu Sasaki

A high-pressure fuel pump accelerates a rise in fuel pressure from engine start-up to shorten an engine start-up time, reduce an exhaust gas substance and improve or increase an engine output. The high-pressure fuel pump is part of a control device which controls an in-cylinder injection engine having a fuel injection valve, a high-pressure fuel pump, and a crank angle sensor. The high-pressure fuel pump is provided with a plunger for pressurizing the fuel placed in the high-pressure fuel pump, a pump drive cam, and a cam angle sensor. A drive signal setting device outputs drive signals to the high-pressure fuel pump at least two or more times from the time of crank angle sensor signal detection to the determination time of the crank and cam angle sensor phases.

High-pressure fuel pump control device and in-cylinder injection engine control device

A stepping motor control apparatus for controlling a stepping motor to drive a fluid flow control valve in an engine includes an operation state monitoring unit for monitoring the operation state of the engine; a step position monitoring unit for monitoring a step position of the stepping motor; a first motor drive direction-determining unit for determining the motor drive direction during normal operations of the stepping motor as determined by a target step position and the present step position of the stepping motor; a second motor drive direction-determining unit for determining the motor drive direction during anomalous operations of the stepping motor; a drive pulse-rate determining unit for determining the pulse generation rate to drive the stepping motor; and a drive unit for driving the stepping motor at the pulse generation rate determined by the drive pulse-rate determining unit.

Stepping motor control apparatus

A control system for an internal combustion engine capable of improving purification performance of a catalytic converter provides an oscillation amplitude for an air/fuel ratio of an air/fuel mixture to be supplied to an internal combustion engine. The air/fuel ratio oscillation amplitude is variable depending upon an operating condition of the internal combustion engine and/or a purification performance of a catalytic converter. Corresponding to the air/fuel ratio oscillation, an oscillation amplitude of a spark ignition timing is provided. The spark ignition timing oscillation amplitude is variable depending upon the operating condition of the internal combustion engine and/or the air/fuel ratio oscillation amplitude.

Control system for internal combustion engine with enhancement of

In a control system for an ignition timing of an internal combustion engine and a control method for the ignition timing, a basic ignition timing of the engine is set, an engine speed is detected, a target value of the engine speed is set while the engine is in idling condition, an ignition timing correction amount is determined depending upon a difference of the target value and a detected engine speed while the engine is in idling condition, the basic ignition timing is corrected with the correction amount, and after the engine speed becomes higher than or equal to a predetermined value, the engine is controlled with the corrected ignition timing.

Method and system for controlling ignition timing for internal

There are provided a first ignition timing table for high-octane fuel and a second ignition timing table for low-octane fuel. When the second table is switched over to the first table, there is at first the difference in between basic ignition timings according to the first and second tables, and then the difference is reduced with time at a constant rate. An actual ignition timing during the switchover of an ignition timing table is determined by subtracting the reducing difference from the basic ignition timing according to the first table. The actual ignition timing when knocking is detected is compared with a predetermined threshold. If the former exceeds the latter, the second table is switched over to the first table, and otherwise the second table is maintained, whereby the actual ignition timing can be changed smoothly even during the switchover of an ignition timing table.

Growing community of inventors

Mito, Japan

Asahiko Otani