Abstract: A central warning apparatus for vehicles which comprises a plurality of sensors mounted to the plurality of portions of vehicle to be inspected, discriminator circuits for discriminating an abnormal state of the sensors, display units connected to the discriminator circuits so as to be effected in response to the abnormal state, an OR-gate circuit connected to the output of respective discriminator circuits, and a main warning unit connected to the OR-gate circuit so as to be effected by an output therefrom for warning that there arises an abnormal state at at least one of portions to be inspected.

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.

Abstract: An automatic transmission system for use with automobiles comprising a gear wheel transmission mechanism, a hydraulic control circuit and an electric computing circuit, said gear wheel transmission mechanism being changed over by said hydraulic circuit under the control of said computing circuit, wherein said computing circuit selects the changing-over conditions of the transmission system in response to the driver's will, as well as the automobile running conditions and automatically establishes a parking condition when the automobile is to be parked, and ensures protection when a malfunction has occured in said hydraulic circuit or said computing circuit.