A control system for an internal combustion engine controls a fuel injection amount based on operating conditions of the engine and an evaporative fuel concentration-dependent correction coefficient. The control system includes a purge control valve arranged in a purging passage connecting a canister for temporarily storing evaporative fuel generated from a fuel tank and an intake passage. This coefficient is held to a predetermined value for a predetermined time period after purging is permitted, and to another for a predetermined time period after purging is inhibited. In another aspect, the purge control valve is controlled based on operating conditions of the engine and a purging flow rate correction coefficient. This coefficient is held when purging is inhibited, and is progressively set to a larger value depending on the evaporative fuel-dependent correction coefficient, after purging is permitted. In another aspect, when a vehicle on which the engine is installed is started, the purge control valve is controlled based on a special purging control amount which is progressively increased based on a parameter related to a standing start of the vehicle. In another aspect, the operation of the purge control valve is inhibited for a predetermined time period dependent on a temperature of the engine, after the start of the engine.

Control system for internal combustion engines

A semiconductor device having a double-side wiring structure, in which a single crystal semiconductor thin film is formed integrally with transistor elements and is laminated on an insulating thin film. The single crystal semiconductor thin film is formed with through-holes and the insulating thin film is formed on its back side with electrodes and a shielding film. A light valve device using the semiconductor device is also disclosed. Over the single crystal semiconductor thin film, there are formed switching elements of transistors, pixel electrodes connected electrically with the switching elements, and drive circuits for scanning and driving the switching elements. Also disclosed is a miniature highly dense light valve device. In this light valve device, an electrooptical substance is arranged between a multi-layer substrate. The multi-layer substrate is formed with electrodes and a shielding film at the opposed side of the insulating film to the side formed with the grouped elements through the insulating film. A transparent opposite substrate is also formed so that the optical transparency of the electrooptical substance is controlled by the switching elements.

Light valve device using semiconductive composite substrate

An engine control system having an oxygen density sensor arranged in an intake system at a position downstream of a throttle valve for detecting the amount of air newly introduced into the engine. The sensor is a limit electric current detection type capable of detecting a continuously changing density of the oxygen. An amount of fuel to be injected is calculated in accordance with the output level of the sensor by using mapped data of the output level of the sensor signal. A precise detection of new air is made possible while maintaining the advantages of the known D-J system. An ignition timing also may be calculated by the signal from the oxygen sensor.

Engine control system

An exhaust gas recirculation control system for an engine, in which the recirculation rate is controlled so as to have a desired value by an exhaust gas recirculation control valve disposed between the exhaust pipe and the inlet pipe of the engine. The control valve is controlled by an electronic control unit which determines the desired recirculation rate from a predetermined relationship based on the operating condition of the engine which is determined by the engine speed and the engine pressure as well as on the output of an oxygen sensor. The inlet pipe of the engine may be divided into two inlet paths, one of which has mounted thereon the oxygen sensor.

Engine exhaust gas recirculation control system

Invented is a method of making combustion air for a fossil fuel burner, as a coal burning power plant, oil refinery or gas fired household appliance. Combustion air is made from solar, wind, biomass, hydropower or geothermal. A staged progression using lower cost greenhouses, or flatplates, or solarponds, feed warm air to higher cost concentrator solar collectors. Wind energy, biomass, geothermal energy heat and compress combustion air. Hydropower also heats and compresses combustion air. Solar evaporation from salt or impure water creates water or local rain for the hydropower system. Combustion air thus is made economically hot, compressed and high velocity, and placed into a heavily insulated pipes for long distance transmission to a distant power plant.

Use of renewable energy like solar, wind, geothermal, biomass, and hydropower for manufacturing combustion air for a fossil fuel burner and firebox

An air-fuel ratio control system for an automobile engine of a type having a fuel injection system wherein at least two of parameters including the engine speed, the opening of a throttle valve and the negative pressure developed inside a fuel intake passage are utilized to detect the rate of flow of incoming air to be mixed with an injected mist of fuel to form a combustible mixture. The amount of fuel to be injected into the intake passage depends on the detected rate of flow of the incoming air. A composition sensor for detecting the concentration of an exhaust gas component is also provided for controlling an EGR control valve for controlling the recirculation of a portion of exhaust gases from an exhaust passage into the intake passage.

Air-fuel mixture control for automobile engine having fuel injection system

PURPOSE:To control the actual air-fuel ratio at the optimum condition by setting a rich air-fuel ratio in a specific operation range of an engine and providing a control system to control EGR amount by an exhaust gas sensor for compensating the air-fuel ratio CONSTITUTION:A microcomputer 14 is provided to control a fuel injection nozzle 5 and a three-way solenoid valve 12 to control the opening degree of an EGR valve controlling EGR amount, while an exhaust gas sensor 19 is provided in an exhaust passage to be connected to the computer 14 Then, in a specific operation range A of an engine, an injection pulse width L0 is previously set to obtain a rich air-fuel ratio According as the actual air-fuel ratio detected by the exhaust gas sensor 19 is richer or leaner than the theoretical one, a duty ratio D of a solenoid valve 12 is increased or reduced by the computer 14 to control the opening of the EGR valve 9, and the EGR amount is regulated for adapting the actual air-fuel ratio to the theoretical one

Exhaust gas purification device for fuel injection type engine

PURPOSE:To provide optimum control of actual air fuel ratio by providing an exhaust sensor in an exhaust path to controllably feedback EGR amount for air fuel ratio control while compensating for the air fuel ratio accompanying EGR. CONSTITUTION:A microcomputer 14 for controlling a fuel injection nozzle 5 and a three-way solenoid valve 12 for controlling the opening of a EGR valve 9 for controlling EGR amount is provided while an exhaust sensor 19 is provided in an exhaust path to be connected to the computer 14. Duty ratio D of the solenoid valve 12 is increased or decreased by the computer 14 according to the case of actual air fuel ratio detected by the exhaust sensor 19 richer or leaner than theoretical air fuel ratio to control the opening of the EGR valve 9 and adjust the EGR amount for providing actual air fuel ratio coinciding with the theoretical one.

Exhaust gas purifying apparatus for fuel injection system engine

PURPOSE:To make the air to fuel ratio precise during the normal driving, and to improve the transition responsibility at the transition driving, by providing two control means so that the control system for the engine can be changed for the normal driving and the transition driving. CONSTITUTION:A microcomputer 14 comprises a central processor CPU23, a A/D converter, an analog multiplexer 25, an input interface circuit 26, an output interface circuit 27, etc., and a throttle sensor 15, a suction negative pressure sensor 16, a water temperature sensor 17, a revolutional frequency sensor 18 and an exhaust sensor 19 are connected thereto. The computer 14 judges whether it is in the normal driving state or transition driving state, and during the normal driving the first EGR control is carried out by an output signal of the exhaust sensor 19, and at the transition driving the second EGR control is carried out according to the MAP3 to increase the transition responsibility.

Apparatus for purifying exhaust gas of fuel jet type engine

PURPOSE:To suppress NOX gas generation over a wide operation range by a method wherein during a specific operation range a control value prestored in accordance with an operation state is read out to set an opening of an EGR control valve and during the rest operation range the valve is controlled by the output of an exhaust sensor CONSTITUTION:An EGR valve 9 installed on the way of an EGR passage 8 is, for example, of a diaphragm type that its opening is controlled in accordance with a negative intake pressure introduced into its negative pressure chamber 9a A negative intake pressure at down stream of a throttle valve 4 is introduced into the negative pressure chamber 9a via an intake passage 10, and a three-way solenoid valve 12 to control the negative intake pressure is installed on this passage 10 Over a specific operation range including a low load and a high load, a control value corresponding to the operation state is read out from a memory means inside a microcomputer 14 where control values are prestored in accordance with operation states to control a solenoid valve 12, and over the rest operation state an EGR valve 9 is feedback controlled in accordance with an output of an exhaust sensor 18

Iida Katsuyoshi

Papers

Air-fuel mixture control for automobile engine having fuel injection system

Exhaust gas purification device for fuel injection type engine

Exhaust gas purifying apparatus for fuel injection system engine

Apparatus for purifying exhaust gas of fuel jet type engine

Purifying device of exhaust gas in fuel injection type engine