Abstract: A hot-wire air flow meter for providing an air flow meter capable of accurately detecting the quantity of air drawn into the internal combustion engine and stabilizing the air flow distribution. The hotwire air flow meter includes a main passage forming an air horn for the internal combustion engine, a hot-wire element for measuring the quantity of air drawn in, a bypass passage installed in the main passage and containing the hot-wire element, the bypass passage consisting of a first passage formed along the main passage axis and a second passage formed in the radial direction of the main passage, and a throttled portion formed between the bypass passage and a throttle valve located downstream of the bypass passage.

Abstract: The present invention whose object is to provide a hot wire type of flow meter capable of accurately detecting a flow rate under various conditions required for satisfying a desire for low fuel consumption of an engine system and space saving in an engine room, the present invention being characterized in a hot wire type of air flow meter including a main flow passage forming an air intake flow passage of an internal combustion engine, a hot wire element measuring intake air, and a bypass having the hot wire element therein and disposed in the main flow passage, the hot wire type of air flow meter comprising: a flow passage forming the bypass, and formed in the axial direction of the main flow passage; and a flow passage forming the bypass and formed in the radial direction of the main flow passage, the flow passage having a structure designed in such a manner that the upper stream portion of an outlet portion thereof projects over the lower stream portion of the same.

Abstract: A compact hot-wire type air flow meter for an internal combustion engine with a high measuring accuracy is provided with a primary flow path forming an intake air passage and an auxiliary flow path incorporating therein a hot-wire element for measuring the intake air. The auxiliary flow path is defined by a flow path in an axial direction of the primary flow path and a flow path in a radial direction of the primary flow path.

Abstract: An intake structure having a throttle body and an intake body connected to the upstream end of the throttle body and provided with a by-pass air passage for mounting an air flow meter. Locating construction is provided on the joint surfaces of the throttle body and the intake body so as to locate these bodies coaxially to each other.

Abstract: A control device for a throttle valve for use with an internal combustion engine installed in a vehicle. The device has a throttle valve shaft secured to the throttle valve, and a linkage to be driven by a linkage member including an accelerator wire for opening and closing the throttle valve. The linkage is a three-joint linkage mechanism including a throttle lever secured to the throttle valve shaft, a lever-mounting shaft secured to the throttle body, a drive lever rotatably mounted on the lever-mounting shaft, and a rod connecting the throttle lever and the drive lever.

Abstract: An intake air flow sensor comprises a sensor main body and a connection unit main body, the former consisting of a main passage for passing intake air and a bypass passage for bypassing part of the air flowing through the main passage and joining it again to the air of the main passage. An intake air flow meter is disposed in the bypass passage to measure the intake air quantity. The bypass passage has an opening which opens to the main passage. A ring is fitted into the main passage of the sensor main body in such a manner as to close part of the opening of the bypass passage. An insulator is clamped by the ring and the connection unit main body. According to this construction, the area of the opening of the bypass passage to the main passage is not changed due to deformation of an insulator when the insulator is interposed between the sensor main body and the connection main body and they are fixed together by bolts.

Abstract: An air-fuel ratio control device for an internal combustion engine equipped with a plurality of variable venturi type carburetors each having a slow system, in which the flow rate of air supplied to the slow systems of the carburetors is controlled depending on the engine operation parameters including, for example, the temperature of intake air, temperature of engine oil and atmospheric pressure to improve the rate of atomization of fuel, thereby improving the idling performance of the engine and therefore improving the fuel consumption of the engine.

Abstract: A throttle valve linkage for use with a multi-carburetor assembly comprising a pair of carburetors has first and second levers secured respectively to the throttle shafts of the first and second carburetors, first and second link members respectively connected at one ends to the free ends of the first and second levers. The other ends of the first and second link members are pivotally connected by a common pivot pin which is slidably movable in a guide channel. The rotation of the first carburetor throttle shaft is transmitted by the linkage to the second carburetor throttle shaft so that the latter is rotated in a direction opposite to the direction of rotation of the first carburetor throttle shaft.

Abstract: A slow fuel controlling device for a carburetor in which fuel metered by a slow jet is mixed with air induced through a slow air bleed in the form of counter flows and the mixture thus formed is supplied into a portion of the intake passage near a throttle valve, and the diameter of the fuel feed passage is selected to substantially fill said passage with fuel by utilizing capillary action.

Abstract: An exhaust gas recirculation system whereby a part of exhaust gas is recirculated to the downstream of the carburetor throttle valve through an exhaust recirculation passage for removing the nitrogen oxides in exhaust gas discharged from an internal combustion engine, wherein a pressure control valve is provided in the after-flow of the flow control valve which controls the rate of exhaust gas recirculated to the downstream of the throttle valve disposed halfway in said exhaust recirculation passage, said pressure control valve being arranged such that its opening will be reduced when negative pressure in the downstream of the throttle valve is high and that said opening will be enlarged when said negative pressure is low, whereby the amount of exhaust gas taken into the engine is made basically proportional to the air intake so that the recirculation ratio will be maintained substantially constant over a wide range of operation.

Abstract: An exhaust gas recirculation system whereby a part of exhaust gas is recirculated to the downstream of the carburetor throttle valve through an exhaust recirculation passage for removing the nitrogen oxides in exhaust gas discharged from an internal combustion engine, wherein a pressure control valve is provided in the after-flow of the flow control valve which controls the rate of exhaust gas recirculated to the downstream of the throttle valve disposed halfway in said exhaust recirculation passage, said pressure control valve being arranged such that its opening will be reduced when negative pressure in the downstream of the throttle valve is high and that said opening will be enlarged when said negative pressure is low, whereby the amount of exhaust gas taken into the engine is made basically proportional to the air intake so that the recirculation ratio will be maintained substantially constant over a wide range of operation.

Abstract: A compact hot-wire type air flow meter for an internal combustion engine with a high measuring accuracy is provided with a primary flow path forming an intake air passage and an auxiliary flow path incorporating therein a hot-wire element for measuring the intake air. The auxiliary flow path is defined by a flow path in an axial direction of the primary flow path and a flow path in a radial direction of the primary flow path.