Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Akio Matsumoto

Mitsuyoshi Yokota

Yoshiyuki Iwaki

Mitsuharu Morishita

Kimiaki Seki

Hitoshi Ogawa

Hiroaki Takada

Satoru Kume

Kiyoichi Shinsei

Shinichi Kouge

Tateo Kume

Michiyasu Yoshida

Yuhiko Kiyota

Yoshihiro Konno

Katsuyuki Tsuji

A vacuum pump comprises a slide shaft having one end provided with a discharging valve and a diaphragm, a cam plate in press-contact with the other end of the slide shaft to cause reciprocating movement of the slide shaft, a shaft of a motor for rotating the cam plate and a bearing casing for holding a bearing which supports the motor shaft in a freely rotatable manner, wherein the cam plate is provided at its one side surface with a recess for receiving the bearing and provided at its other side surface with a cam surface.

Vacuum pump

A motor drive vacuum pump comprises a motor provided with a rotor, a stator and a housing holding the rotor and the stator therein, a vacuum pump which is attached on the side surface of the motor housing and is driven by the motor to forcibly feed air from an intake port to a discharge port to thereby generate vacuum, a discharging passage means comprising a discharging hole for introducing the air to be discharged through the discharge port of the vacuum pump into the motor interior and a through hole formed in a part of the housing to discharge the air introduced into the motor interior to the atmosphere, and a discharge valve provided in a part of the discharging passage means.

Motor drive vacuum pump

A snap-action diaphragm having an electrically conducting central portion is electrically insulated inside a case to separate it into two parts each of which is ported to a fluid, and is biased by an electrically conducting spring towards one port which serves as an electrical contact to form a switch with the diaphragm when connected to an external circuit. The snap-action characteristic of the diaphragm between two stable states when coacting with the biasing force of the spring provides a hysteresis force that can be predetermined to avoid hunting of the switch in response to anticipated alterations in pressure difference across the diaphragm. In another embodiment, the diaphragm also acts to open or shut a valve to control fluid flow, again with the benefit of hysteresis to prevent hunting during operation.

Pressure-responsive apparatus having hysteresis to prevent hunting

A D.C. charging and starter circuit for a vehicle includes a microcomputer which monitors the state of battery switch units, a pair of charging generators and a starter switch, and operates to control various switching elements and the like to prevent accidental discharge of the batteries, and to prevent damage to either the electrical load or the generator rectifier circuits.

Microcomputer-controlled DC three-wire circuit for vehicle

A pressure control apparatus, which can be used for a braking force magnification apparatus for a vehicle or a door closing and opening apparatus includes a sensor for sensing a pressure within a vacuum booster. The sensor is of a transfer-contact-type including a medial movable contact and two stationary contacts. The movable contact makes contact with one of the stationary contacts connected to an alarm lamp but breaks contact with the other connected through a control circuit to a DC motor connected to a vacuum pump or a compressor when the absolute gauge pressure produced by the vacuum pump or compressor is below a first predetermined threshold value. The movable contact breaks contact with the one stationary contact to energize the DC motor when the absolute gauge pressure is below a second predetermined threshold value but is above the first one. When the absolute gauge pressure is above the second predetermined threshold value, the movable contact makes contact with the other contact to deenergize the DC motor.

Pressure responsive pump drive motor control apparatus having spot

A control device for a power-driven pump used for a car comprising a d.c. motor, an air pump driven by the d.c. motor and an exhaust device for reburning and purifying exhaust gas from an engine by actuating the air pump, wherein sensors for detecting quantity of air necessary to be fed into the exhaust device to purify the exhaust gas and a variable control device to variably control the revolution speed of the d.c. motor depending on the quantity of air.

Control device for a power-driven air pump for a car

An apparatus for controlling the supply of air to a burner used to recombust diesel particulates trapped in a ceramic filter. The inventive control apparatus includes an exhaust bypass line that bypasses the filter, an air supply line leading to a burner associated with the filter, a flow control valve that adjusts the cross-sectional area for the air flow in the air supply line, a relief valve that maintains a constant difference between pressures at points upstream and downstream of the flow control valve, and a control unit that controls the degree of opening of the flow control valve. With the invention, precise control over the flow rate of secondary air is ensured.

Regenerator for diesel particulate filter

The present invention relates to a power supply system for vehicles having a generator which includes an armature coil for generating three-phase alternating current, a field coil held in opposition to the armature coil, a rectifier for converting an A.C. output of the armature coil into a direct current, and a voltage regulator for setting the generated voltage of the armature coil at a constant value by controlling a current flowing through the field coil, and a first battery which is connected across output terminals of the generator; a starting motor and an electric load connected in parallel with the first battery; and consists of a two-battery power supply system for vehicles comprising a second battery which is connected to an ignition device separately from said first battery, and which is charged by a power source other than said generator.

Two-battery power supply system for vehicles

A vehicular charging and starting system is improved by providing first and second a.c. generators, rectifiers and voltage regulators, the negative terminal of the first rectifier and the positive terminal of the second rectifier being connected to a neutral or body grounded conductor. A pair of batteries are respectively positively and negatively connected to said neutral or grounded conductor. Protection circuits may be provided for overcurrent protection of the rectifiers or electrical loads, and for preventing the starter motor from rotating at an excessive speed once the engine is started.

Vehicular direct-current three-wire electric system

A pump control system has a vacuum pump driven by a DC motor to supply a negative pressure to a container first power and driving transistors which are interconnected to energize the DC motor, second power and driving transistors which are interconnected to turn an alarm lamp on, and a pressure sensor having a set of normally closed contacts which are connected to the first driving transistor and which are connected via a Zener diode to the second driving transistor; the contacts opened by at least a predetermined negative pressure within the container so as to immediately turn the first power transistor off and so as the second power transistor off with a time delay as determined by a parallel combination of a capacitor and a resistor connected to the Zener diode.

Pressure responsive pump control system having an alarm lamp

Disclosed is a control for a pumping device in vehicle application in which, upon throwing a power switch (6) and closing a brake actuator switch (8), a second driver transistor (76) is rendered conductive and a first driver transistor (75) non-conductive, thereby rendering a power transistor (71) conductive. The power transistor in the conductive state enables a DC motor (2) to be supplied with a DC voltage from batteries (5). The DC motor drives a pump (1) which in turn feeds a pressure to activate a pressure-operating unit (10). A pressure detecting switch (4) detects the pressure of the pump and particularly provides a pressure detection signal when the pressure reaches a predetermined value. In response to the pressure detection signal the first driver transistor becomes non-conductive and the power transistor becomes conductive, thus supplying the DC voltage to the DC motor.

Control for pumping devices used in vehicles

Disclosed is a control for a pumping device in a vehicle application in which, upon throwing a power switch (6), a capacitor (85) is charged and a power transistor (81) is rendered conductive thereby supplying a DC voltage from batteries (5) to a DC motor (2). The DC motor drives a pump (1) which in turn feeds pressure to a pressure-operating unit (10) for storage therein. If a given period of time has elapsed after throwing of the power switch, then the voltage charged on the capacitor increases to make a transistor (83) conductive and the power transistor (81) non-conductive. In other words, the DC motor is operated to provide pressure to the pressure-operating unit for only the given period of time after throwing of the power switch. Furthermore, upon closure of a brake actuator switch (4) another transistor (84) becomes conductive and the above transistor (83) becomes non-conductive. This renders the power transistor (81) conductive and supplies the DC voltage to the DC motor.

In a diaphragm apparatus, such as a switch having a diaphragm to be driven by a pressure difference between two spaces, an iron disk is fixed to the center of the diaphragm and a ring-shaped permanent magnet is fixed to an inside wall of a case to magnetically attract the iron disk. This provides hysteresis in the force-motion characteristic of the diaphragm to reduce hunting.

Diaphragm apparatus having a magnetically imparted hysteresis

A diesel particulate filter system for treating the exhaust gas of a diesel engine which is small in size and inexpensive. The system includes a particulate filter connected in a gas line from the engine, a burner, including an ignition plug, connected at a point upstream of the particulate filter and which is supplied with fuel, a primary air flow for atomizing the fuel, and a secondary air flow for burning the particulates trapped in the particular filter and which supplies the particulate filter with a hot burning gas produced by the ignition plug. Primary and secondary pumps supply, respectively, the primary and secondary air flows. A single motor drives both the primary and secondary air pumps. The ignition plug and motor are controlled so that when the amount of particulates trapped in the filter exceeds a preset level, the ignition plug and motor are activated to clean the filter by burning the particulates in the burner.

Diesel particulate filter system

Disclosed is a control for pumping devices in vehicle application. Upon closure of a brake actuator switch (4) subsequent to actuation of a power switch (6) a power transistor (81) becomes conductive and a DC voltage from batteries (5) is fed to a DC motor (2). The brake actuator switch when brought into an open position permits supply of the DC voltage to the base of the power transistor through a time constant circuit (85, 86) for a limited period of time, so that the power transistor becomes conductive to supply the DC voltage to the DC motor for that period. The DC motor activates a pump (1) which in turn operates a pressure-operating unit (10).

Growing community of inventors

Hyogo, Japan

Akio Matsumoto