| 摘要 |
A deacceleration warning system employs relay isolation between a control loop containing a driver controlled switch, and an operating loop for activating the braking lamps. The relay bypasses the brake pedal switch for use during downshift deacceleration for manually flashing the braking lamps. A vacuum controlled mode switch in the control loop holds the system in a disable mode except during downshift deacceleration. The enable mode is temporarily established when the accelerator pedal is lifted by an increase in the manifold vacuum. Electrical, mechanical, and thermal termination transients within the control loop, the relay structure, and operating loop cause electrical, mechanical and thermal lags which prolong the trailing edge of the manual flash beyond the release of the hand operated switch. This post-release illumination assures that the warning flash cycle will have at least a minimum duration independently of the depression period of the switch.
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