Abstract: An ECU (13) includes: throttle-valve opening-degree control means (131) for controlling an intake airflow rate; target output-torque calculating means (132) for calculating a target output torque from an operating state of an engine (1) and an operation of an accelerator performed by a driver; target ignition-timing calculating means (133) for calculating target ignition timing based on the operating state of the engine (1); actual output-torque calculating means (134) for calculating an actual output torque of the engine (1) based on an engine rpm, a charging efficiency, the target ignition timing, an air-fuel ratio, and a total heating value of a fuel; and target intake-air quantity calculating means (135) for calculating a charging efficiency-to-torque conversion factor based on the charging efficiency and the actual output torque, and calculating a target charging efficiency based on the target output torque and the charging efficiency-to-torque conversion factor to calculate a target intake air quantity

Abstract: A fuel control system of the present invention is a fuel control system that controls a fuel injection quantity of an internal combustion engine by controlling combustion of a fuel at a theoretical air-fuel ratio, and is characterized in that the fuel control system estimates a volume of the fuel injection quantity from a measured refractive-index value of the fuel and controls it.

Abstract: An idle stop control device for determining on the basis of a charging state of a battery whether idle stop should be executed or not includes, as a unit for detecting the charge state of the battery, an optical fiber type battery solution concentration sensor including an optical fiber which is partially immersed in battery solution to measure the refractive index of the battery solution, thereby measuring the concentration of the battery solution.

Abstract: A fuel supply apparatus comprising a housing 10a made of a molded polymer material and containing therein a filter element 8 of a fuel filter 10 for filtering the fuel from the fuel pump 4.b and a supply passage 12 for introducing the filtered fuel from the fuel filter 10 to an engine. A pressure regulator 9 is provided for opening a valve 13 when the fuel pressure within the supply passage 12 is equal to or more than a predetermined pressure to return an excess amount of the fuel to the fuel tank 1 for regulating the fuel pressure within the supply passage 12. A a check valve 13 is also integrally incorporated in the supply passage 12 for preventing the reverse flow of the fuel from the engine.

Abstract: A pressure regulator includes a case having a fuel inlet port for receiving fuel from a fuel pump, a fuel outlet port for delivering fuel to an internal combustion engine, and an opening. A valve element is attached to an elastic diaphragm that closes the opening. The valve element has a discharge passage for discharging excess fuel by allowing the interior and the exterior of the case partitioned by the elastic diaphram to communicate with each other. A spring seat is provided in the case in face-to-face relation to the valve element in such a manner as to close the discharge passage of the valve element during pressure contact. A spring is also provided for bringing the valve element into pressure contact with the valve seat with a predetermined pressure.

Abstract: A circumferential flow type liquid pump has, and a pump casing including a pump base and a pump cover. The pump casing rotatably supports an impeller and defines an elongated arcuate pump flow path along the outer periphery of the impeller and a suction inlet and a discharge outlet at both ends of the pump flow path. A plurality of gas venting holes are formed in a sliding surface of the pump cover along the pump flow path and communicate with the outside of the pump. Bubbles formed in the fuel in the pump flow path are positively discharged out of the pump casing assembly, and no vapor lock is caused.

Abstract: A circumferential flow type liquid pump includes an impeller with vanes on its outer periphery, and a pump casing assembly defining an arcuate elongated pump flow path along the outer periphery of the impeller and a suction inlet and a discharge outlet at both ends of the pump flow path. The pump casing assembly includes a radially-extending gas venting path which is opened in the inner periphery of the pump flow path near the impeller and separated by a step from the bottom of the pump flow path, and a through-hole much larger in sectional area than the gas venting path, through which the gas venting path is communicated with the outside of the pump casing assembly. Bubbles formed by vaporization of the fuel in the pump flow path are positively discharged from the pump casing assembly, and no vapor locking is caused.

Abstract: A circumferential flow type fuel pump has an impeller rotated by engagement between a hole in the impeller and a rotating shaft having a diameter smaller than that of the hole. The center ofthe hole is eccentric with respect to the center of the impeller in accordance with the difference between the diameter of the hole and the diameter in section of the rotating shaft, so that the center of the impeller coincides with the center of the rotating shaft during rotation of the impeller.

Abstract: A circumferential flow type fuel pump has a circumferential fuel flow passage provided around an impeller and a gas discharging hole formed in the inner wall of the fuel flow passage in such a manner that the fuel flow passage is communicated with the outside of the fuel pump. The upstream and portion of the fuel flow passage extends to a position near the gas discharging hole and is formed into a flow passage enlarging part by increasing its sectional area radially outwardly, whereby the pumping capacity is substantially maintained unchanged even under severe operation conditions such as at a high fuel temperature.

Abstract: A motor-operated pump of the in-tank type including a motor for driving the pump, the motor having a commutator; a bracket covering one end of the motor disposed adjacent to the commutator; a brush held against the commutator through a through hole formed in the bracket; and a bearing for supporting a shaft of the motor. An annular projection is formed on a central portion of a surface of bracket disposed in opposed relation to the commutator, and the annular projection is formed integrally with the bracket. Alternatively, an annular projection is formed on a central portion of the commutator disposed in opposed relation to the bearing, and the annular projection is made of an electrically insulating material constituting the commutator, and is formed integrally with the commutator.

Abstract: A motor-operated pump of the in-tank type has a driving motor with a commutator; a bracket covering one end of the motor adjacent to the commutator; a brush held against the commutator through a through hole formed in the bracket; an electrical noiseprevention element in a bottomed hole formed in the bracket, and electrically connected to the brush; and a terminal electrically connected to the electrical noiseprevention element. A brush spring-holder plate is fitted in the bracket for holding a brush spring urging the brush. An outer cover is fitted on the bracket for covering the bracket and the brush spring-holder plate.

Abstract: In an in-tank type motor-operated pump, a pair of electric-noise suppressors (20) are contained in a pair of holes (22e) formed in a bracket (22) which holds brushes (4) and a rotor shaft (5), thereby incorporating the electric-noise suppressors in a body of the pump with the shortest connection wirings and without substantial increase of overall volume of the pump.

Abstract: In an in-tank type motor-operated pump having a brush motor (1), a bearing (15) for rotatably holding a rotor shaft (5) is covered with a heat resistant insulating material (25) and is mounted in a bracket (22) in which brushes (4) are slidably held, thereby preventing an accidental shortcircuit between brushes (4) via the bearing (15) at the time when the bracket (22) melts with heat.

Abstract: A fuel supplying pump having a switching circuit provided in the pump closing. The switching circuit stops the pump when an engine stops rotating due, for instance, to a fuel pipe breakage. The circuit having a transistor with a base connected to an oil pressure responsive switch.

Abstract: An in-tank type fuel pump in which an impeller within the pump chamber is rotated by a motor disposed within a fuel chamber within a main body to pump fuel. A through hole in communication with a fuel chamber of the motor portion is provided in a side wall of the pump chamber on the motor side close to the upstream end of the annular channel defining the fuel chamber of the motor portion.

Abstract: In an in-tank type motor-driven pump actuated by feeding a power from the outside of a pump casing through an external conductor, an end of the external conductor is extended inside the pump through a through hole formed in an upper motor cover; the external conductor is held in the through hole by a supporting member, and the end of the conductor is directly or indirectly connected to a brush for the motor.

Abstract: An electric fuel pump is provided with an insulative holding member 20 for holding choke coils 16 and connecting portions 23 between the choke coils and lead wires (14) as well as between the choke coils and brushes 10, to be mounted in the interior of a pump frame 1. In this electric fuel pump, the insulative holding member 20 holds and fixes the choke coils 16 and the connecting portions around the same, thereby to protect the choke coils 16 and the nearby connecting portions against vibration and shocks applied to the fuel pump. The holding member 20 also insulates conductive parts so that the same are not in contact with a housing 1 of magnetic material or the like, thereby to improve insulativity.