Fluid-pressure and analogous brake systems – Electric control
Patent
1984-10-22
1988-01-26
Caldwell, Sr., John W.
Fluid-pressure and analogous brake systems
Electric control
303 7, 307356, B60T 1374
Patent
active
047213442
ABSTRACT:
An electric brake control circuit is responsive to an activation signal and a vehicle deceleration signal for generating a brake control signal representing a predetermined amount of braking. A comparator compares the voltage level of the brake control signal with the voltage level of a sawtooth waveform to produce a pluse width modulated signal having a duty cycle corresponding to the predetermined amount of braking. This pulse width modulated signal is supplied to an output driver for generating a brake driving signal to energize the brakes. The activation signal is generated at the voltage level of the vehicle power supply when the driver actuates the vehicle stop light switch. The circuit is responsive to the activation signal for disabling the output driver when the voltage level of the activation signal is below a predetermined level. The circuit also senses the current load on the brake driving signal to protect the output driver in the event of a full or partial short circuit condition. As the sensed current load progressively exceeds a predetermined level, the circuit progressively increases the average voltage level of the sawtooth waveform, thus causing the comparator to reduce the duty cycle of the pulse width modulated signal.
REFERENCES:
patent: 3350142 (1967-10-01), Schuman
patent: 3574414 (1971-04-01), Jacob
patent: 3874743 (1975-04-01), Fleischer et al.
patent: 3909075 (1975-09-01), Pittet
patent: 4074194 (1978-02-01), Wilkerson
patent: 4084859 (1978-04-01), Bull et al.
patent: 4295687 (1981-10-01), Becker et al.
Herbert Taub and Donald Schilling, "Digital Integrated Electronics", (New York:McGraw-Hill Book Co. 1977), pp. 192-193.
Ayers David T.
Frait John S.
Warner Michael D.
Caldwell Sr. John W.
Kelsey-Hayes Company
Oberley Alvin
Skinkiss Ralph J.
Sobanski Mark J.
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