Liquid level detecting and indicating system for vehicle
AssigneesNippondenso Co., Ltd., Toyota Jidosha Kogyo Kabushiki Kaisha
InventorsHiroshi Arai, Jun Ohta, Koichi Taniguchi, Yasuhiko Sakurai, Toshikazu Ohtake
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Abstract
An improved liquid level detecting and indicating system for vehicles comprising a pair of liquid level detecting elements which are arranged in opposite positions on the detecting level of a liquid in a liquid container installed in a vehicle, whereby when each of the liquid level detecting elements sends a signal indicating that the liquid level has dropped below a reference liquid level, an indicator is brought into operation. In this way, the level of liquid can be accurately detected and indicated without being influenced by the inclination or vibration of a vehicle body.
Claims7
A liquid level detecting and indicating system for a vehicle having a liquid container comprising a pair of liquid level detecting elements arranged spaced apart in opposite positions on a detecting level of a liquid in said liquid container and along a straight line inclined with respect to the direction of movement of said vehicle, circuit means for generating an output signal when each of said liquid level detecting elements generates a signal indicating that the level of said liquid in said liquid container has dropped below said detecting liquid level, and an indicator actuated by said output signal from said circuit means.
A liquid level detecting and indicating system for a vehicle having a liquid container comprising a pair of thermal variable resistance elements arranged in opposite positions on a detecting level of a liquid in said liquid container, a discrimination circuit connected to each of said thermal variable resistance elements for discriminating the resistance level thereof, each said discrimination circuit comprising a Schmitt trigger circuit having a pair of transistors, an AND circuit for generating an output signal when each of said discrimination circuits generates an output signal, and an indicator actuated by said output signal from said AND circuit.
A liquid level detecting and indicating system for a vehicle having a liquid container comprising:
- a pair of reed switches arranged with a space in opposite positions on a detecting level of a liquid in said liquid container for detecting that the level of the liquid in said liquid container is dropped below said detecting liquid level, each of said reed switches adapted to be opened and closed by a magnet float,
- a Miller integrator circuit connected to said pair of reed switches for generating an output signal when said Miller integrator circuit detects that both of said pair of reed switches keep to operate over a predetermined period of time,
- a switching circuit connected to said Miller integrator circuit and actuated to generate another output signal in response to said output signal from said Miller integrator circuit, and
- an indicator connected to said switching circuit and actuated by said another output signal from said switching circuit for indicating that the level of the liquid in said liquid container is dropped below said detecting liquid level.
Dependencies are inferred from the claim text.