Electric vehicle and on-board battery charging apparatus therefor

1. A vehicle, comprising:

an electric propulsion drive assembly;

a plurality of ground engaging members driven only by the electric propulsion drive assembly;

a first cooling circuit for the electric propulsion drive assembly, the first cooling circuit including a first coolant other than oil;

an engine, including a crankcase having an oil sump;

a pre-heater for the oil sump in fluid communication with the first cooling circuit for pre-heating engine oil, the pre-heater being incorporated into the engine oil sump and comprising a heat exchanger utilizing the first coolant as the pre-heating medium for heating the oil;

a second cooling circuit for cooling the engine, the second cooling circuit circulating a second coolant to a portion of the engine different from the pre-heater;

an electric storage unit coupled to the electric propulsion drive assembly; and

a generator driven by the engine for recharging the electric storage unit, wherein the first cooling circuit circulates the first coolant to the generator.

2. The vehicle of claim 1 , wherein the oil sump has a lower surface defining a portion of the pre-heater.

3. The vehicle of claim 2 , wherein the oil sump lower surface defines cooling passageways and the pre-heater further comprises a cover plate enclosing the passageways.

4. The vehicle of claim 1 , wherein the second cooling circuit includes a passenger compartment heating element for heating a passenger compartment of the vehicle.

5. The vehicle of claim 4 , further comprising an electric heater for the passenger compartment and a control circuit to determine whether to operate the electric heater or to start the engine and operate the passenger compartment heating element of the second cooling circuit.

6. The vehicle of claim 1 , wherein the portion of the engine includes a water jacket of the engine.

7. The vehicle of claim 1 , wherein the first and second cooling circuits are discrete.

8. The vehicle of claim 1 , wherein the first cooling circuit has a lower maximum operating temperature than the second cooling circuit.

9. The vehicle of claim 1 , wherein the pre-heater is integrated with the oil sump of the crankcase.

10. The vehicle of claim 1 , further comprising a control mechanism to start the engine and generator at defined charge levels of the electric storage unit.

11. A vehicle, comprising:

an electric propulsion drive assembly;

a first cooling circuit for cooling the electric propulsion drive assembly, the first cooling circuit including a first coolant;

an engine including a crankcase having an oil sump;

a pre-heater for the oil sump in fluid communication with the first cooling circuit for pre-heating engine oil, the pre-heater comprising a heat exchanger utilizing the first coolant as the pre-heating medium for heating the oil and the first coolant is a liquid other than oil; and

a second cooling circuit for cooling the engine, the second cooling circuit including a second coolant, the first and second cooling circuits being fluidly separate from one another, each of the first and second coolants being routed through the engine.

12. The vehicle of claim 11 , wherein the first cooling circuit has a lower maximum operating temperature than the second cooling circuit.

13. The vehicle of claim 11 , wherein the pre-heater is integrated with the oil sump of the crankcase.

14. The vehicle of claim 11 , wherein the oil sump has a lower surface defining a portion of the pre-heater.

15. The vehicle of claim 11 , further including a generator operative to output electrical energy used by the electric propulsion drive assembly, the first cooling circuit circulating coolant to the generator.

16. The vehicle of claim 11 , wherein the first cooling circuit and the second cooling circuit each include a radiator.

17. The vehicle of claim 11 , wherein the engine oil is contained within the engine.

18. The vehicle of claim 11 , wherein the first and second coolants are water.