Abstract: A catalyst for internal combustion engine exhaust purification without frequently switching to a rich burn mode. The catalyst includes a catalyst A containing an NOx absorbing substance and an NOx reducing catalyst, a catalyst B containing a hydrogen adsorption substance and a hydrogen oxidizing catalyst, an electron conductive substance C, and an ion conductive substance D. Electrons move between the catalyst A and the catalyst B through the electron conductive substance C, ions move through the ion conductive substance D, and an electrochemical reducing reaction and an electrochemical oxidizing reaction respectively occur on the catalyst A and on the catalyst B. Therefore, it is possible to quickly reduce the adsorbed NOx using the adsorbed hydrogen without depending on the atmosphere.

Abstract: A nonvolatile memory built in a vehicle control computer and storing control software and an auxiliary storage for setting an unerasable region to the nonvolatile memory and updating the control software in an erasable region to new control software are used.

Abstract: A fuel pressure detector and a pressure accumulator are disposed in a fuel distribution line, an engine control apparatus controlling activation of a fuel pump based on output from the fuel pressure detector. The fuel pump is activated at maximum capacity to fill the fuel distribution line with fuel at a controlled pressure controlled by a fuel pressure regulator, then stopped. In this state, fuel accumulated under pressure in the pressure accumulator replenishes the fuel distribution line until fuel pressure inside the fuel distribution line drops to a predetermined value due to fuel injection by fuel injection valves.

Abstract: A nonvolatile memory built in a vehicle control computer and storing control software and an auxiliary storage for setting an unerasable region to the nonvolatile memory and updating the control software in an erasable region to new control software are used.

Abstract: A non-volatile memory device 80 or 800 is provided, wherein intrinsic information indicating variances of characteristics of individual units is stored in advance in the inexpensive memory device 80 or 800 through a simple processing procedure with a view to adjusting a control quantity with high accuracy upon ordinary control by executing software with a microcomputer 55A or 300A. Thus, a control system for a motor vehicle exhibiting excellent performances can be implemented at low costs, which allows accurate and precise adjustment to be realized through a simplified adjusting step while reducing an extraneous space for adjustment of variance without need for use of any specific part of high precision.

Abstract: A thermal flow sensor comprising a heat-sensitive electrical resistor having a substantially uniform temperature profile so that the heat radiation which causes a measurement error is decreased. The resistor element of the resistor comprises a main heat-sensitive section having a first resistance temperature coefficient and a thermal bullet section having a second resistance temperature coefficient greeter than the first temperature coefficient by at least 1,000 ppm, the thermal buffer section being positioned in the vicinity of the support means. The first temperature coefficient may be a negative value and the second temperature coefficient may be a positive value and the base member may be made of zirconia. Alternatively, the thermal flow sensor of the present invention may comprises the heat-sensitive resistor element which has a negative resistance temperature coefficient along its entire length.

Abstract: In an engine speed control method including detecting a signal representing an error between an actual engine speed and a desired idling speed, and controlling both an ignition timing of an engine according to the error signal and an intake air quantity or an air/fuel mixture quantity to be sucked into the engine in order to make an engine speed to the desired engine speed; the improvement comprising the step of correcting the intake air quantity and the air/fuel mixture quantity to the engine according to an ignition timing error signal representing an error between an actual ignition timing of the engine and an ignition timing predetermined in accordance with an engine operation condition.

Abstract: A failure-time control device for a fuel injection controller of an internal combustion engine provided with a failure-time by-pass throttle valve control device to maintain a by-pass throttle valve at a definite aperture on the basis of an output signal from a trouble detecting device for detecting trouble occurred in an intake air flow detecting device; and a failure-time fuel injection valve control device which calculates a fuel quantity on the basis of a relationship of a fuel injection quantity with respect to an aperture of a main throttle valve to be determined by a definite aperture maintained by said by-pass throttle valve and the number of revolution of the engine, based on an output signal from said trouble detecting means, and which feeds by injection the fuel into the internal combustion engine by controlling the fuel injection valve on the basis of the quantity as calculated.

Abstract: A fuel-injection control system for an internal combustion engine capable of ensuring the stable and proper backup operation of the engine in case of a failure of an intake-air sensor without suffering from any substantial influence from the amount of intake air flowing through a bypass conduit which bypasses a part of intake air in an intake passage across a throttle valve.