Aisan Kogyo Kabushiki Kaisha

Tetsuji Inoue

Takehide Nakamura

Mamoru Tateishi

Yuichi Manabe

Hiroaki Miyazaki

Shuji Yamamoto

Lei Zhang

Hiroya Abe

Takumi Kamiya

Takeshi Suzuki

Yasuo Hosokawa

A rotational position sensor includes a rotor substrate and a stator substrate placed to face each other to detect rotational displacement of the rotor substrate. The rotor substrate is formed with an excitation coil in a meandering pattern on an outer circumferential side and a rotor-side rotary transformer on an inner circumferential side. The stator substrate is formed with four detection coils in a meandering pattern on an outer circumferential side and a stator-side rotary transformer on an inner circumferential side. The four detection coils are arranged in a circumferential direction without overlapping each other. The detection coils are displaced from each other by 360&#xb0;/8. The rotational position sensor includes a high frequency excitation circuit for applying a high frequency signal to the excitation coil through the rotor-side rotary transformer and the rotor-side rotary transformer to excite the excitation coil.

Rotation position sensor

An electromagnetic induction type rotary encoder includes an excitation board including an excitation coil, a detection board fixed to a movable element to face the excitation board and including a detection coil placed to face the excitation coil with a clearance therefrom, and a controller for outputting an excitation signal to the excitation coil and processing a detection signal output from the detection coil. The controller includes an excitation circuit for exciting the excitation coil at high frequency and a high-frequency generating circuit, a demodulation circuit for demodulating a signal from the detection coil in accordance with excitation to the excitation coil, a waveform shaping circuit for waveform shaping a signal from the demodulation circuit, and a pulse generating circuit for outputting a pulse signal based on the signal from the waveform shaping circuit. Each of the excitation coil and the detection coil is formed in a meandering coil pattern.

Position sensor

A phase difference type resolver is adapted such that a calculator calculates an angle from a phase difference at a detection-signal zero cross point, determines a velocity at the angle based on an angle calculated from a phase difference at a previous detection-signal zero cross point, calculates an estimated angle at a next detection-signal zero cross point based on the velocity, divides a difference between the estimated angle and the angle into predetermined minimum detection angles, and outputs a real-time signal based on the minimum detection angles in a range after the angle but before the estimated angle.

Phase difference resolver of estimated real-time output

In a fault diagnosis system () in a load driving arrangement, the fault diagnosis system detecting a fault in the load driving arrangement in which a controller () outputs a control signal to a driver () and the driver () drives a load () according to the control signal, a fault detecting unit () and an exclusive OR circuit () are provided to enable outputting, as a monitor signal, a signal opposite to the control signal upon detecting a fault in the load driving arrangement and outputting, as a monitor signal, the same signal as the control signal when not detecting a fault, a monitor signal output from the exclusive OR circuit () is input to the controller (), and the controller () compares the control signal and the monitor signal and diagnoses whether a fault occurs in the load driving arrangement, based on the result of the comparison.

Fault diagnosis system in load driving arrangement and fuel pump control system

The present invention provides a fuel supply device that can suppress the excessive heating of a fuel supplied from a fuel pump into an internal combustion engine even if a control module is cooled. The fuel supply device () comprises a set plate () attached to a mounting hole () of a fuel tank (), an electric fuel pump () attached to an inner surface of the set plate (), a control module () attached to an outer surface of the set plate (), the control module driving the fuel pump () using electric power supplied from the exterior, and a heat radiating member () for radiating heat generated in the control module. One end of the heat radiating member () is thermally connected to the control module (), and the other end of the heat radiating member () protrudes downward from the inner surface of the set plate ().

Fuel supply device

A fuel pump unit includes a fuel pump which is driven by a motor, a secondary filter case placed to surround the fuel pump and contains a filter, a reserve cup which houses the fuel pump and the secondary filter case, and a pump controller which drivingly controls the fuel pump. A shielding material is provided in the reserve cup to shield electrical noise generated by the fuel pump. The shielding material is grounded. The pump controller includes a pump drive circuit which is provided with an electric filter.

Fuel supply apparatus

A resolver includes an excitation signal generator which generates a sine wave and a cosine wave as an excitation signal, a rotor which receives the excitation signal, and a rotary transformer which detects an output signal of the rotor, the resolver being arranged to detect angle information of the rotor. The resolver further includes a controller which outputs angle information at a zero cross point of the output signal detected by the rotary transformer. The resolver can provide high detection accuracy and be low in cost.

Angle detection device

A fuel supply system comprises an engine control unit (ECU), a fuel pump with a built-in pump motor which is PWM controlled based on a control signal from the ECU, a pump controller for controlling supply of electric power to the pump motor, and sensors for detecting an operating state of the engine. A control section of the pump controller controls to change a frequency to be lower as a duty ratio of a PWM control signal to operate a power transistor of an output circuit is higher and inversely to change the frequency to be higher as the duty ratio is lower.

Growing community of inventors

Nagoya, Japan

Tetsuji Inoue