Importance

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Abstract

A constant-speed cruising control apparatus for vehicles, which comprises a reed switch for generating a vehicle speed signal, a set switch for setting the cruising speed, a memory circuit for storing and outputting a cruising speed signal, a first comparing circuit for comparing the cruising speed signal with the vehicle speed signal, an actuator for actuating a throttle valve according to a signal output from the first comparing circuit, a first computing circuit for calculating expectation value of vehicle speed change on basis of the signal output from the first comparing circuit, a second computing circuit for calculating change of the vehicle speed signal, a second comparing circuit for comparing signals output from the first and the second computing circuits, and a down-shift circuit for shifting an automatic transmission into lower gear on basis of a signal output from the second comparing circuit.

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First Claim