Nippondenso Co., Ltd.

Nippon Soken, Inc.

Hiroyuki Aota

Junya Morikawa

Toyoji Yagi

Takaji Murakawa

Hiroshi Tashiro

Tokio Kohama

Hideki Obayashi

Masatoshi Kuroyanagi

Shigenori Isomura

Toshikazu Ina

Yurio Nomura

Osamu Fukasawa

A vibration damping control system for an automotive vehicle is provided. This system includes a torque generator operating with given operation timing to produce a torque vibration of a preselected frequency and an operation timing controller. The operation timing controller initially determines a phase difference between engine revolution and frequency of vehicle vibration formed of a resultant vector defined by a first vibration component caused by movement of a crankshaft of the engine and a second vibration component caused by movement of a piston of the engine. The controller then modifies the operation timing of the torque generator to provide the torque vibration in an opposite phase relative to the vehicle vibration based on the phase difference determined to compensate the vehicle vibration.

Vibration damping control apparatus for vehicle

An air/fuel control system for an internal combustion engine or the like delivers evaporated gas from the engine's fuel tank and adsorbed in a canister to an intake of the engine via a discharge route. A purge vacuum switching valve (VSV 16) disposed in the discharge route controls the rate at which the evaporated gas is delivered to the engine intake. Using a sensor, the air/fuel ratio of the engine intake is determined and the deviation of the detected air/fuel ratio from a target ratio calculated according to learned air/fuel ratio parameters is calculated. The density of the evaporated fuel stream is determined based on that deviation, and the VSV is driven based on the calculated evaporated gas density. If the air/fuel parameters are not learned within a predetermined time, the VSV is driven at a fixed rate. A drive signal to the engine's fuel injection system also may be corrected based on the calculated evaporated fuel density.

Air-fuel ratio system for an internal combustion engine

A system for solving disturbances in the air-fuel ratio caused by a change in the normal correction factor, and permitting achievement of a highly accurate air-fuel ratio control. Fuel evaporative gas generated in a fuel tank is adsorbed in a canister, and then discharged into an intake pipe of an internal combustion engine. ECU calculates the fuel supply quantity to the internal combustion engine on the basis of the condition in which the internal combustion engine is operating, performs feedback control and learning control of an air-fuel ratio on the basis of a detection signal from an oxygen sensor, and corrects the fuel supply quantity by means of an air-fuel correction factor. ECU also controls fuel injection by an injector by decrement-correcting the fuel supply quantity in response to the quantity of discharged evaporative gas. Furthermore, ECU adjusts, upon decrement correction of the fuel supply quantity in response to the quantity of discharged evaporative gas, the quantity of the decrement correction so as to be proportional to the normal correction factor including the air-fuel ratio correction factor.

Fuel evaporative gas and air-fuel ratio control system

Disclosed is an engine starting apparatus which suppresses engine vibrations and noises during engine cranking and reduces consumption of electric power supplied for engine cranking. When an engine starts to rotate to produce its torque, electric power supplied to a starter motor for engine cranking is reduced gradually so that a sum of torques produced by the starter motor and the engine may be prevented from increasing excessively. In the case a generator/motor is used for engine starting, operation of the generator/motor is switched from motor operation to generator operation for suppressing excessive speed rise when engine starting is completed.

Engine starting apparatus for vehicles

A piezoelectric apparatus includes a piezoelectric device which is biased by a fluid force instead of a spring. Since the fluid force can be maintained within a predetermined value even after the piezoelectric device has been used number of times, and since the fluid force can be modulated by fluid pressure providing means and valve means when the fluid force is decreased from the predetermined valve, the present piezoelectric apparatus can maintain the initial pressure on the piezoelectric device.

Laminated type piezoelectric apparatus

An internal combustion engine has a plurality of cylinders and intake passages leading to the cylinders respectively. A plurality of intake control valves block and unblock the intake passages respectively. Drive devices open and close the intake control valves mutually-independently. A detecting device serves to detect a predetermined condition of the engine under which a speed of the engine is required to vary. A control device performs a control of closing the intake control valves mutually-independently by use of the drive devices after the detecting device detects the predetermined condition of the engine.

Growing community of inventors

Kariya, Japan

Hiroyuki Aota