Test circuit for motor vehicle speed control

Claim 2

For use with a motor vehicle speed control system of the type having vacuum servo means for moving a throttle, solenoid valve means for increasing and decreasing the vacuum in the servo means, selector switch means for actuating the system and selecting the speed, an electronic control module for controlling the solenoid valve means in response to the speed selected, and speed sensor means for providing to the control module electrical pulses corresponding to the actual vehicle speed, an improved test means, comprising: a test circuit adapted to be connected to the control module and having series leads connecting terminals of the solenoid valve means and selector switch means directly with respective terminals of the control module; indicating means in the test circuit for indicating whether or not voltage potential is present in the series leads; and oscillator means in the test circuit for applying pulses to the control module that simulate pulses provided by the speed sensor means corresponding to a selected speed.

Claim 3

The test means according to claim 1 wherein the indicating means comprises: an indicating lead connected to each series lead and connected through a light source to ground, so that voltage potential present in each of the series leads will energize the light source.

Claim 4

The test means according to claim 1 wherein the test circuit further comprises means for shifting the solenoid valve means independently of the control module.

Claim 5

The test means according to claim 1 wherein the test circuit has a bypass lead connecting a terminal of the speed sensor means through a light source to a voltage source, so that grounding by the speed sensor means will actuate the light source.

Claim 6

For use with a motor vehicle speed control system of the type having vacuum servo means for moving a throttle, solenoid valve means for increasing and decreasing the vacuum in the servo means, selector valve means for actuating the system and selecting the speed, an electronic control module for controlling the solenoid valve means in response to the speed selected, and speed sensor means for providing to the control module electrical pulses corresponding to the actual vehicle speed, the solenoid valve means, speed sensor means and selector switch means having terminals connected into a wire harness which has a plug connected to terminals of the control module, an improved test means, comprising: a test circuit adapted to be connected between the wire harness plug and the control module; the test circuit having series leads interconnecting the terminals of the solenoid switch means and selector switch means directly with the respective terminals of the control module; the test circuit having oscillator means for providing output pulses that simulate pulses provided by the speed sensor means corresponding to a selected speed, the oscillator means output pulses being applied to the terminal of the control module that normally receives the speed sensor pulses.

Claim 7

For use with a motor vehicle speed control system of the type having vacuum servo means for moving a throttle, solenoid valve means for increasing and decreasing the vacuum in the servo means, selector valve means for actuating the system and selecting the speed, an electronic control module for controlling the solenoid valve means in response to the speed selected, and speed sensor means for providing to the control module electrical pulses corresponding to the actual vehicle speed, the solenoid valve means, speed sensor means and selector switch means having terminals connected into a wire harness which has a plug connected to terminals of the control module, an improved test means, comprising: a test circuit adapted to be connected between the wire harness plug and the control module; the test circuit having series leads interconnecting the terminals of the solenoid switch means and selector switch means directly with the respective terminals of the control module; the test circuit having oscillator means for providing output pulses that simulate pulses provided by the speed sensor means corresponding to a selected speed, the oscillator means output pulses being applied to the terminal of the control module that normally receives the speed sensor pulses.

Claim 8

For use with a motor vehicle speed control system of the type having vacuum servo means for moving a throttle, vacuum solenoid valve means for drawing a vacuum in the servo means and vent solenoid valve means for venting the servo means to atmosphere, selector switch means for actuating the system and selecting the speed, an electronic control module for controlling the solenoid valve means in response to the speed selected, and speed sensor means for providing to the control module electrical pulses corresponding to the actual vehicle speed, the solenoid valve means, speed sensor means and selector switch means having terminals connected into a wire harness which has a plug connected to terminals of the control module, an improved test means, comprising: a test circuit adapted to be connected between the wire harness plug and the control module; the test circuit having series leads interconnecting the terminals of the solenoid valve means and selector switch means directly with the respective terminals of the control module; oscillator means in the test circuit for providing output pulses that simulate pulses provided by the speed sensor means corresponding to a selected speed, the oscillator means output pulses being applied to the terminal of the control module that normally receives the speed sensor pulses; an indicating lead connected to each series lead and connected through a light source to ground, so that voltage potential present in each of the series leads will energize the light source; a vacuum switch means connected between ground and the indicating lead that is connected to the series lead of the vacuum solenoid means for selectively providing a path to ground for energizing the vacuum solenoid means; and a vent switch means connected between ground and the indicating lead that is connected to the series lead of the vent solenoid means, for selectively providing a path to ground for energizing the vent solenoid means.

Claim 9

For use with a motor vehicle speed control system of the type having vacuum servo means for moving a throttle, vacuum solenoid valve means for drawing a vacuum in the servo means and vent solenoid valve means for venting the servo means to atmosphere, selector switch means for actuating the system and selecting the speed, an electronic control module for controlling the solenoid valve means in response to the speed selected, and speed sensor means for providing to the control module electrical pulses corresponding to the actual vehicle speed, the solenoid valve means, speed sensor means and selector switch means having terminals connected into a wire harness which has a plug connected to terminals of the control module, an improved test means, comprising: a test circuit adapted to be connected between the wire harness plug and the control module; the test circuit having series leads interconnecting the terminals of the solenoid valve means and selector switch means directly with the respective terminals of the control module; oscillator means in the test circuit for providing output pulses that simulate pulses provided by the speed sensor means corresponding to a selected speed, the oscillator means output pulses being applied to the terminal of the control module that normally receives the speed sensor pulses; an indicating lead connected to each series lead and connected through a light source to ground, so that voltage potential present in each of the series leads will energize the light source; a vacuum switch means connected between ground and the indicating lead that is connected to the series lead of the vacuum solenoid means for selectively providing a path to ground for energizing the vacuum solenoid means; and a vent switch means connected between ground and the indicating lead that is connected to the series lead of the vent solenoid means, for selectively providing a path to ground for energizing the vent solenoid means.