Information handling and control systems

Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile

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Details

307 91, 307 108, 340459, B62D 4500, J02J 100

Patent

active

048395307

ABSTRACT:
A battery (+V) operable information handling and control system, for example for an automotive vehicle electrical system, has a central unit (10) and a number of remote units (20) each connected to the central unit (10) by a respective signalling link (40). The central unit (10) includes processing and control circuitry (13) and power supply circuitry (11) which are turned on to operate the processing and control circuitry (13) in an active mode of the system and are turned off in a sleep mode of the system. During the active mode the processing and control circuitry (13) applies a clock pulse voltage to a data line (41) in each signalling link (40). One of the clock pulse lines (41) is connected to power supply control circuitry (12) in the central unit (10) and to activation voltage drive circuitry (80) in the respective remote unit (20). When the system is in the sleep mode the activation voltage drive circuitry (80) can be enabled by operation of a activation switch (60, 61) connected to that remote unit (20) so as to apply to that clock pulse line (41) an activation voltage, substantially the battery +V voltage (12 volts) and lower than the clock pulse voltage (30 volts). The power supply control circuitry (12) is enabled by the activation voltage so as to turn on the power supply circuitry (11) and the activation voltage drive circuitry (80) is then disabled responsive to the clock pulse voltage consequently applied at the start of the active mode.

REFERENCES:
patent: 4302841 (1981-11-01), McCulloch
patent: 4370561 (1983-01-01), Briggs
patent: 4386279 (1983-05-01), Yoshimi et al.
patent: 4551801 (1985-11-01), Sokol
patent: 4616224 (1986-10-01), Reighard
patent: 4639609 (1987-01-01), Floyd et al.
patent: 4658150 (1987-04-01), Mizuno et al.
patent: 4677308 (1987-06-01), Wroblewski et al.

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