Motor vehicles – With means responsive to speed of vehicle for maintaining... – Including electrically actuated servomechanism
Patent
1990-12-21
1992-02-04
Kashnikow, Andres
Motor vehicles
With means responsive to speed of vehicle for maintaining...
Including electrically actuated servomechanism
123350, 36442604, B60K 3104
Patent
active
050852876
ABSTRACT:
An improved cruise control apparatus for a vehicle having a fail-safe function is provided in which indefinite operations of the apparatus at the time of failure in the power supply thereof can be avoided. A cruise control switch has a plurality of switch elements connected in parallel with each other, the switch elements being selectively operated to change the output voltage at the output terminal of the cruise control switch so as to provide a plurality of command signals for setting and cancelling cruise control. A control unit is connected to the output terminal of the cruise control switch for performing a plurality of different cruise control operations in response to the cruise control command signals from the cruise control switch. The control unit includes a plurality of comparators each having a first input terminal connected to the output terminal of the cruise control switch and a second input terminal supplied with a reference voltage. A primary power supply is commonly connected to the input terminal of the cruise control switch and the control unit in such a manner that the second input terminals of the comparators are supplied with a plurality of different reference voltages. A secondary power supply is connected to the second input terminals of the comparators for shifting the reference voltages at the second input terminals of the comparators to a fail-safe side when the primary power supply fails.
REFERENCES:
patent: 4931939 (1990-06-01), Kawata et al.
patent: 4941098 (1990-07-01), Yasuwaka et al.
Speed Control Group 37, Ford 1985 Car Shop Manual, p. 37-05-17 (1985).
Katayama Kazuyori
Utsumi Yoshiyuki
Camby Richard
Kashnikow Andres
Mitsubishi Denki & Kabushiki Kaisha
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