Abstract: A pressure detecting apparatus having a pressure introducing pipe is installed on an intake surge tank for detecting inner pressure in the intake surge tank. The intake surge tank is provided with a throttle passage having a throttle is disposed in the intake surge tank along a flow direction of the gas for increasing a flow speed of the gas. A pressure inlet at a leading end of the pressure introducing pipe is positioned in a vicinity of the throttle.

Abstract: A delivery pipe of a fuel supply system for injectors mounted on a cylinder head is divided for each injector or a group of injectors. Divided pipe parts are coupled with each other through a flexible member to allow flexing of the delivery pipe. Each injector is connected with the delivery pipe through a flexible coupling member and with the cylinder head through a flexible cushioning member. Alternatively, a fuel passage is formed in the cylinder head in place of the delivery pipe to supply fuel to the injectors after heating in the cylinder head.

Abstract: To excellently grow flame kernel while lowering breakdown voltage, a bypass electrode comprising a semiconductor material is installed in a path bypassing an inductive spark gap between a center electrode and a ground electrode, and the center electrode and the ground electrode are electrically connected by the bypass electrode and capacitive discharge is carried out by applying breakdown voltage between the center electrode and the ground electrode via the bypass electrode, and thereafter, inductive discharge is carried out through the inductive spark gap.

Abstract: A delivery pipe of a fuel supply system for injectors mounted on a cylinder head is divided for each injector or a group of injectors. Divided pipe parts are coupled with each other through a flexible member to allow flexing of the delivery pipe. Each injector is connected with the delivery pipe through a flexible coupling member and with the cylinder head through a flexible cushioning member. Alternatively, a fuel passage is formed in the cylinder head in place of the delivery pipe to supply fuel to the injectors after heating in the cylinder head.

Abstract: An abnormal combustion detection apparatus for an internal combustion engine quickly detects the occurrence of preignition by using a knock sensor. When the knock sensor detects an engine knocking, the ignition timing is delayed. If despite the delay of ignition timing, the knocking is not decreased and the air-fuel ratio detected after the delay of ignition timing is less than the air-fuel ratio detected before the delay of ignition timing, it is determined that preignition has occurred.

Abstract: An apparatus for detecting a condition of burning in an internal combustion engine includes a pair of opposed electrodes provided in a combustion chamber of the engine, and an AC voltage applying device for applying an AC voltage between the opposed electrodes. A current detecting device is operative for detecting a current flowing between the opposed electrodes. A current generating means for generating a current-representing signal depending on the detected current, the current generating means having a differentiating circuit for differentiating the AC voltage into the capacitance-current representing signal. In another aspect of this invention, the apparatus further comprises calculating means for calculating ratios between a parameter represented by the burning-ion current representing signal and a parameter represented by a signal depending on the AC voltage applied between the opposed electrodes.

Abstract: A fuel injection control device in a cylinder direct injection engine which switches between premixed combustion by intake stroke injection and stratified combustion by compression stroke injection in accordance with a change of an engine speed or a required load, where an unpleasant torque shock occurring when the injection mode is changed and the combustion state is changed despite the vehicle operating in the driving pattern such as driving on an upward slope or downward slope is prevented by maintaining the same injection mode while the vehicle continues to operate in the same driving state and where stratified combustion by the compression stroke injection is carried out when the vehicle is in driving on a downward slope, but is augmented by intake stroke injection when the vehicle sharply accelerates and the torque becomes insufficient.

Abstract: A combustion monitoring apparatus for an internal combustion engine is provided which includes a voltage supply circuit, a combustion monitoring circuit, and a control circuit. The voltage supply circuit applies the voltage to plug electrodes of a spark plug mounted in a combustion chamber of the engine. The combustion ion monitoring circuit monitors a variation in amount of combustion ions existing between the plug electrodes to determine a combustion condition of the engine based on the current flowing through the plug electrodes produced by application of the voltage to the electrodes. The control circuit controls an operation of the voltage supply circuit so that the voltage is applied across the plug electrodes prior to a discharge duration of a spark plug mounted in the combustion chamber of the engine for monitoring preignition.

Abstract: An apparatus for preventing flow noise which suppresses the noise caused at the time of opening of a throttle valve provided in an intake passage of an internal combustion engine etc. At the downstream side of a pair of clearances formed at the top and bottom when the throttle valve opens, a means is provided acting on the flows of air passing through at least one of the clearances to reduce the flow rate and acting on the flows to cause the point of convergence of the flows of air passing through the pair of clearances to shift to the downstream side.

Abstract: A combustion monitoring apparatus for an internal combustion engine is provided which is designed to distinguish abnormal combustion conditions from a normal combustion conditions using a combustion ion current included in a current flowing through plug electrodes of a spark plug, resulting from motion of ions between the plug electrodes which are produced by combustion. For example, if a maximum value of the combustion ion current during one combustion cycle is smaller than a given value, it is determined that a misfire has occurred. If an attenuation time from generation of the current flowing through the plug electrodes until a variation in the current is decreased to a given value is shorter than a given time period, it is determined that a flame has been blown out before combustion is completed.

Abstract: A canister for use in an evaporative emission control system of an automotive vehicle is provided which includes a box-like casing, an inlet port formed in one end wall of the casing through which fuel vapors generated within a fuel tank are drawn into the canister, and a plurality of vapor-adsorbing passages each of which is filled with activated carbon and has a given length through which the fuel vapors drawn through the inlet port flow. The vapor-adsorbing passages are all arranged within said casing in parallel to each other. This arrangement allows the casing to be of a flat shape which facilitates easy installation of the canister within a flat space around a fuel tank.

Abstract: An antidiffusion layer is provided between a first fuel adsorption layer communicated with a fuel tank and a second fuel adsorption layer communicated with air. Since adsorbing ability of the antidiffusion layer is lower than that of the first and second fuel adsorption layers, pore diffusion of the fuel vapor from the first fuel adsorption layer to the second fuel adsorption layer is reduced. Since the antidiffusion layer forms a plurality of nonlinear passages, air diffusion of the fuel vapor is reduced. Therefore, the diffusion of the fuel vapor is suppressed with a thin, small and simple antidiffusion layer, and the canister can be simplified and the reduction of the number of parts and the cost thereof can be realized.

Abstract: To enable bonding flat and corrugated sheets at their contact points by laser welding or other welding methods while laminating and spirally winding the sheets, a process of producing a metal catalyst carrier for exhaust gas purification in the form of a metal honeycomb column composed of flat and corrugated metal sheets alternately laminated, wound together, and bonded to each other, the process includes the steps of: forming plural openings in a flat sheet of a metal; laminating one piece of the flat sheet having the openings formed therein and one piece of a corrugated sheet of a metal and bonding the laminated flat and corrugated sheets to each other to form a composite sheet; and spirally winding the composite sheet around an axis to form columnar turns each composed of an outer flat layer composed of the flat sheet and an inner corrugated layer composed of the corrugated sheet, while bonding an outer turn and an adjoining inner turn by welding an inner corrugated layer of the outer turn, in a portion ex

Abstract: By using a small heat accumulator installed in a cooling water system, malfunction of exhaust emission during warming up is prevented. Such a cooling system includes a cooling water passage for returning cooling water flowing from a cooling water outlet of an automotive engine to a cooling water inlet through a radiator, a first bypass passage for returning the cooling water just after flowing from the cooling water outlet to the cooling water inlet through the radiator, a second bypass passage for returning the cooling water just after flowing out from the cooling water outlet of the engine to the cooling water inlet through the radiator by supplying the cooling water near a heat-sensing portion of a thermostat, a flowing amount adjusting valve for enlarging a cooling water flowing ratio to the first bypass passage with respect to the second bypass passage corresponding to a reduction of a load of the engine and the heat accumulator installed through the first bypass passage.

Abstract: An evaporative emission control system which may be used in automotive vehicles is disclosed. The evaporative emission control system includes a canister, an inlet passage, a fuel vapor passage, an outlet valve, and an inlet valve. The air inlet passage is exposed at an end to the atmosphere and connected at the other end to the canister for drawing fresh air into the canister. The fuel vapor passage communicates between the canister and a fuel tank. When a pressure in the fuel tank is increased above a given level so that a difference in internal pressure between the fuel tank and the canister reaches a first value, the outlet valve establishes communication between the fuel tank and the canister to allow fuel vapor evaporated within the fuel tank to be drawn into the canister through the fuel vapor passage.

Abstract: An engine rotating speed sensor detects intake sound information due to the drive of an engine. A controller generates a signal having a frequency corresponding to a desired ratio of orders based on the detected intake sound information. Further, a phase and an amplitude the signal are controlled, and so a speaker arranged in a propagation path of the intake sound of the engine generates control sound to control the intake sound due to the drive of the engine. An engine noise control apparatus which is capable of effectively reducing or waveform-reshaping a wide range of engine noise. The apparatus has an engine rotating speed sensor for detecting an engine rotating speed and a waveform generator circuit for converting a rotation pulse signal to a periodic signal having a frequency which is a predetermined multiple of the detected engine rotating speed.

Abstract: An exhaust gas purifying apparatus includes a carrier of a honeycomb structure which is made of at least one flat metal plate and at least one corrugated metal plate which is superimposed on the flat metal plate. A catalytic layer is formed on the surface of the carrier. The carrier suited for being coated with the catalytic layer is disposed in an exhaust pipe of an internal combustion engine. The carrier is provided, on an axially intermediate portion thereof, with a large number of louvers which causes a haphazard secondary motion in the exhaust gas. A predetermined portion of the carrier including the turbulence producing portion and an additional region located adjacent to said predetermined region is coated with a larger amount of catalyst than that with which the remaining portion of the carrier is coated, whereby good purifying efficiency can be obtained for a long time.

Abstract: A device for cancelling annoying sounds caused by operation of an internal combustion engine. An intake sound of the engine, and also a rotational speed of the engine, are obtained. The phase difference between the present intake sound and a desired intake sound is obtained using map data. The map data depends on the rotational speed of the engine and is specifically calculated so that at least the (n+0.5) harmonics (n integer.gtoreq.0) are cancelled. The phase data is used to drive a ceramic speaker or two oppositely directed ceramic speakers, to appropriately compensate the input sound.

Abstract: A vibration isolator designed to improve mounting facility is disposed between a vibration source and a base on which the vibration source is supported. The vibration isolator has an elastic member provided between the vibration source and the base to elastically support the vibration source, a main chamber in which a fluid is enclosed and the volume of which is changed according to a deformation of the elastic member, a sub chamber defined by an elastic membrane and communicating with the main chamber through an orifice, a moving member provided in a fluid chamber formed by the main and sub chambers, and an actuator for driving the moving member. The actuator is fixed to the elastic membrane in a fluid sealing manner, and drives the moving member from the outside of the fluid chamber formed by the main and sub chambers through attachment members connected to the moving member.

Abstract: The present invention provides an intake control valve which is able to reduce intake air leakage, control the amount of intake air with high accuracy, and to allow easy installation to an intake manifold. The intake control valve of an intake control device according to the present invention has a valve body, a case, and an actuator. The valve body is rotatably installed in the case, opening and closing an openingclosing passage formed in the case. The case is fitted with the actuator, which functions to rotate the valve body. In the meantime, the intake manifold is provided for a mounting bore formed for insertion of the case. On the outer side of the case are installed sealing members, which contact the wall surface of the mounting bore to prevent air leakage. The intake control valve is installed in the mounting bore formed in the intake manifold after assembling the valve body, the case and the actuator into one unit.