Nippondenso Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Nippon Steel Corporation

Toyota Jidosha Kogyo Kabushiki Kaisha

Yutaka Okuda

Ken Asami

Kazunori Sakai

Satoshi Hirano

Kazukiyo Okada

Hiromi Maehata

Nobuo Kondo

Takashi Tsuchida

Yasuo Takahashi

Noriyuki Nakashima

Kimio Tamura

Hatsuhiko Oikawa

Shinichi Hori

Syouichi Masaki

Shoichi Masaki

Tohru Saito

Goro Watanabe

Toshio Shinohara

Fuminori Matsuda

Kazuo Narita

Katsutoshi Ueno

The present invention relates to a resistance welding method suitable for use in spot welding between a steel-base metal sheet, which has been plated for rust prevention purposes, and an aluminum-base metal sheet and aims to permit a current to flow at a high density across the plated steel sheet and the aluminum-clad steel sheet, thereby realizing high-quality welding. An aluminum-clad steel sheet comprised of a steel layer having projections and an aluminum layer is interposed between the plated steel sheet and the aluminum-base metal sheet to be welded to each other. An electrode is energized by a predetermined weld current from an alternating power supply. The current path is limited to the area of the projections, and metallic melt formed by melting of the plating is accommodated between the projections, preventing the current-carrying area from being increased. Consequently, the temperature of the interface of the plated steel sheet and the aluminum-clad steel sheet can be efficiently raised, resulting in the formation of a proper nugget on both sides of the aluminum-clad steel sheet.

Method and material for resistance welding steel-base metal sheet to

In an apparatus for detecting the abnormality of a rotational speed sensor adapted for, for example, an anti-skid control system, a time period within which a subsequent pulse will be generated by the rotational speed sensor in response to the rotation of a body of revolution such as wheel is estimated on the basis of the latest pulse interval of the pulses previously generated therefrom and a value corresponding to the force of inertia of the wheel developed on the braking operation thereof. The determination of abnormality of the rotational speed sensor is made when the subsequent pulse is not produced within the estimated time period. This is arranged based on the fact that the pulse interval depends upon the inertial force of the wheel. With the above arrangement, the abnormality detection of the speed sensor can be quickly made, so that a fail-safe control in a braking system can be speedily performed in response to the occurrence of abnormality of the speed sensor.

Detection of abnormality for rotational speed sensor

A failure diagnosis system for a vehicle includes a failure detection means for detecting failures of devices or apparatuses installed in a vehicle, a storage means for storing failure information detected by the failure detection means, a failure display means for displaying failure information stored in the storage means, a time information means for adding failure information detected by the failure detection means and stored in the storage means to time information showing the time when the failure information is detected, a retrieval time input means for inputting a retrieval time and a selective display means for displaying selectively failure information which has time information being within the retrieval time.

Failure diagnosis system for vehicle

In an anti-skid control system for a motor vehicle there is provided a fail-safe control system for providing a compensation for a proper vehicle braking operation against the occurrence of failure of a hydraulic pressure control valve. The fail-safe control system includes a device for monitoring a control signal for controlling the operation of the control valve so that the hydraulic pressure applied to a wheel braking cylinder is regulated for preventing a wheel of the vehicle from skidding. The monitoring device detects the occurrence of failure of the control valve when the control signal indicative of one of the operation modes of the control valve is continuously generated more than a predetermined time period. In response to the detection, the fail-safe control system switches a directional control valve to the passage-opening condition so that the hydraulic pressure from a master cylinder can directly be applied to the wheel braking cylinder, thereby enabling the braking operation to be controlled by a vehicle driver.

Anti-skid control with fail-safe function

A multiple signal transmitting apparatus for automobiles includes a plurality of switches mounted on the steering wheel of an automobile, a multiplexing circuit mounted on the steering wheel for multiplexing the output signals of the switches, at least one light-emitting device mounted on a moving part rotatable together with the steering wheel so as to be arranged on a circumference lying in a plane perpendicular to the central axis of rotation of the steering wheel and concentric with the central axis of rotation to generate a light signal in response to the multiplexed output signal of the multiplexing circuit, at least one light-sensitive device mounted on the surface of the steering wheel bearing portion facing the light-emitting device to receive the light signal from the light-emitting device and generate an output signal, and a decoder circuit mounted on the body portion of the automobile to decode the output signal of the light-sensitive device to generate signals corresponding to the output signals of the switches.

Multiple signal transmitting apparatus for automobiles

A method of and an apparatus for indicating a remaining fuel quantity for vehicles, designed to digitally indicate the quantity of fuel remaining in the fuel tank of a vehicle. The method of and the apparatus for repeating the operations of performing sampling detection of an amount of fuel remaining in the fuel tank of a vehicle, determining a center value for a plurality of remaining fuel quantity values detected by a microcomputer, determining limit values each thereof being apart from the center value by a predetermined amount, using any subsequent detected value exceeding the limit values as a new limit value, computing an average value of a predetermined number of detected sampling values, and indicating it on a display.

Method of and apparatus for indicating remaining fuel quantity for

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Kariya, Japan

Yutaka Okuda