Abstract: A turn signal reminder circuit for warning a vehicle driver that the vehicle turn signals may have been inadvertently left actuated. Turn signal flasher pulses are low pass filtered to provide a continuous enabling signal which initiates the operation of an astable, multivibrator timer circuit. The timer circuit switches asymmetrically between a first occurring longer-time, partial cycle and a shorter-timer, partial cycle. A sound alarm is enabled by the timer during each shorter-time, partial cycle. The alarm is actuated by flasher pulses when the alarm is enabled, but is disabled and the timer circuit is reset in response to operation of the vehicle brake. A pulse detecting circuit for using flasher pulses to turn on the timing circuit has no large capacitor and this permits miniaturization.

Abstract: A vehicle turn signal mechanism includes a lockout device in the form of an electric timer. The flashing signal is normally cancelled by a steering wheel sensor that is arranged to generate a triggering signal for an electromagnetic detent associated with a signal selector lever. The lockout device prevents the triggering signal from being generated except after the steering wheel has been retained in its straight-ahead position for a predetermined time period.

Abstract: An electronic flasher switch, for use in vehicular signalling systems. The flasher features automatic timeout and an audio oscillator for timing and for optional audio signalling to supplement interior turn signal dash indicator lights. A single integrated circuit and two small capacitors allow compact, low cost implementation.

Abstract: A turn signal control circuit has a power source, left and right turn signal inputs, a speed detection input and circuitry for conditioning the power source voltage and current as well as the input signals for proper operation. When a turn signal switch provides an input signal to a logic controller, the circuit begins flashing the respective turn signal. Upon release of the switch, a microprocessor reviews the vehicle speed by way of a speedometer input line and references a lookup table to determine the proper distance at which to turn off the signal. Generally, the faster the vehicle is travelling, the longer the turn signals are left on. Various manual cancellation options are also available to the motorcycle operator. A four-way flasher sysem is operated by simultaneously pushing the two turn signal switches, remaining on until both switches are again simultaneously pressed.

Abstract: An uncancelled turn signal indicator senses both that the monitored vehicle has a speed in excess of a predetermined threshold, and that a turn signal indicator for the vehicle has been selected for more than a predetermined period of activation. Upon sensing coincidence of both conditions, audible and visual indicators are provided to the driver of the vehicle to alert the driver of this condition.