F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
F02B 67/00 (2006.01) A01B 71/06 (2006.01) B60K 17/28 (2006.01) F01P 11/16 (2006.01) F02D 45/00 (2006.01) F16D 48/06 (2006.01)
Patent
CA 2200619
An overheat protection circuit includes a resistor having a first lead connected to the engine temperature switch and the PTO relay coil circuit. The second lead of the resistor is connected to the output of an interlock circuit to provide energizing voltage signal to the PTO relay for operation of the PTO driven attachment when preselected operating conditions are present on the vehicle. If for any reason the engine temperature rises above a preselected maximum operating temperature, the engine temperature switch will close and cause the voltage at the second lead to drop below the minimum operating voltage of the PTO relay. The PTO relay deenergizes to remove drive from the attachment. The PTO cannot be reengaged until the engine operating temperature drops below the maximum operating temperature. The resistor preferably is a positive temperature coefficient thermistor to reduce power dissipation through the circuit while the temperature switch is closed and the PTO relay is deenergized.
Borden Ladner Gervais Llp
Deere & Company
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