Motor vehicles – With means responsive to speed of vehicle for maintaining... – Including fluid pressure actuated servomechanism
Patent
1982-06-18
1985-06-11
Peters, Jr., Joseph F.
Motor vehicles
With means responsive to speed of vehicle for maintaining...
Including fluid pressure actuated servomechanism
180179, 307471, B60K 3100
Patent
active
045222800
ABSTRACT:
A device for automatically disengaging an automotive cruise control system whenever one or more failures or malfunctions occur in the vehicle brake system and also if such a malfunction should occur when the vehicle is in the "resume speed" mode of the cruise control system. The device comprises an exclusive NOR circuit whose two symmetrical input terminals are connected to opposite sides of the brake switch in series with the vehicle power source. The output from the exclusive NOR circuit is connected to a logic control circuit and through a control resistor to a vehicle power lead. Any malfunction of the brake circuit when the cruise control is in operation will cause the exclusive NOR output to go from a relatively low to a relatively high potential thereby causing a logic control circuit to provide a disconnect signal to a throttle actuator. An additional safety factor is attained by connecting the control resistor to the base of a transistor in a power lead to the throttle actuator. A third safety factor is provided in a redundant brake circuit portion of the logic control wherein a peak speed register is provided to enable a constant comparison with actual speed so that an abnormal fall-off of speed below a preselected level in the "resume mode" of the cruise control can be detected and cause a disconnect signal.
REFERENCES:
patent: 3455411 (1969-07-01), Carp
patent: 4084659 (1978-04-01), Abend
patent: 4158192 (1979-06-01), Muto
McCarthy Joseph G.
Peters Jr. Joseph F.
Zemco, Inc.
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