US 10,889,268 B2
Isolating circuit for wiper system
Nithyanandam Nagendran, Trichy (IN); and Richard Franklin Shults, LaGrange, GA (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Apr. 24, 2018, as Appl. No. 15/961,664.
Prior Publication US 2019/0322243 A1, Oct. 24, 2019
Int. Cl. B60S 1/08 (2006.01); H02P 5/46 (2006.01); B60S 1/38 (2006.01); B60S 1/56 (2006.01)
CPC B60S 1/0814 (2013.01) [B60S 1/38 (2013.01); B60S 1/56 (2013.01); H02P 5/46 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A wiper system comprising:
a first motor configured to operate a first wiper;
a second motor configured to operate a second wiper wherein the first motor and the second motor are connected in a parallel configuration;
a power source in electrical connection with the first motor and the second motor for energizing each motor to move the respective wipers;
a switch configured to simultaneously operate the first motor and the second motor in one of a high speed mode, a low speed mode, or a park mode; and
an isolating circuit configured to isolate the first motor from the power source and allow the second motor to run independent of the first motor when:
the switch is set in the park mode, and
speed of the first motor is different from speed of the second motor,
wherein the isolating circuit includes a single relay electrically connected to low speed terminals of the first motor and the second motor, a first diode electrically connected to high speed terminals of the first motor and the second motor, and a second diode electrically connected to the low speed terminal of the first motor and the only one relay.