Hybrid vehicle with combustion engine/electric motor drive

Abstract

A vehicle including a prime mover, a generator mechanically coupled to the prime mover, a first multi-input drive unit having at least first and second rotational inputs and at least one rotational output wherein the first rotational input is coupled to the prime mover, a first electric motor mechanically coupled to the second rotational input and electrically coupled to the generator and a first pair of vehicle drive wheels coupled to the rotational output.

1 . A work vehicle comprising:
 an engine;   a first generator coupled to the engine;   a drive shaft coupled to the engine;   a drive axle coupled to the drive shaft;   first and second wheel ends coupled to the drive axle;   first and second wheels coupled to the associated first and second wheel ends;   a wheel end drive assembly coupled to at least one wheel end, the wheel end drive assembly comprising:
 an electric motor powered by the first generator; 
 a planetary gearset having a first input coupled to the drive axle, a second input coupled to the electric motor, and an output; 
   a second generator mechanically coupled to the engine;   a drive control unit configured to control the engine and the electric motor and to generate a control signal based upon at least one of torque and speed requirements of the work vehicle; and   a central tire inflation system coupled to the drive control unit and configured to regulate tire pressure based at least in part upon the control signal.   
   
   
       2 . The work vehicle of  claim 1 , wherein the work vehicle includes:
 a series mode of operation, wherein the work vehicle is driven exclusively by the electric motor; and   a parallel mode of operation, wherein the work vehicle is driven by a combination of the engine and the electric motor.   
   
   
       3 . The work vehicle of  claim 1 , where the second generator is configured to synchronize system inertia during a transition from series mode to parallel mode. 
   
   
       4 . The work vehicle of  claim 1 , wherein the work vehicle includes a wheel end drive assembly associated with each wheel of the vehicle. 
   
   
       5 . The work vehicle of  claim 1 , wherein the work vehicle includes a drive shaft clutch disposed along the drive shaft, wherein the drive shaft clutch is configured to actuate between an engaged state to rotationally hold the drive shaft and disengaged state. 
   
   
       6 . The work vehicle of  claim 5 , wherein the work vehicle includes a hybrid drive control unit configured to:
 generate a hybrid drive control signal based upon torque and speed requirements of the vehicle.   
   
   
       7 . The work vehicle of  claim 6 , further comprising:
 a drive shaft clutch control unit configured to engage or disengage the drive shaft clutch based upon the hybrid drive control signal.   
   
   
       8 . The work vehicle of  claim 6 , wherein the hybrid drive control unit is configured to generate a signal during a turning operation to increase power supplied to the wheel end located on the outside of a turning radius. 
   
   
       9 . The work vehicle of  claim 1 , wherein the work vehicle includes a power storage system. 
   
   
       10 . The work vehicle of  claim 9 , wherein the work vehicle includes a regenerative breaking system electrically coupled to the power storage system and disposed at the wheel. 
   
   
       11 . A work vehicle comprising:
 an engine;   a motor/generator coupled to the engine;   a generator mechanically coupled to the engine;   a drive shaft coupled to the engine;   a drive axle coupled to the drive shaft;   first and second wheel ends coupled to the drive shaft;   first and second wheels coupled to the associated first and second wheel ends;   a wheel end drive assembly coupled to at least one wheel end, the wheel end drive assembly comprising:
 an electric motor disposed external to the wheel end powered by the generator; 
   a planetary gearset disposed external to the wheel end, the planetary gearset having a first input coupled to the drive shaft, a second input coupled to the electric motor, and an output coupled to the drive axle;   a drive control unit configured to control the engine and the electric motor and to generate a control signal based upon at least one of torque and speed requirements of the work vehicle; and   a central tire inflation system coupled to the drive control unit and configured to regulate tire pressure based at least in part upon the control signal.   
   
   
       12 . The work vehicle of  claim 11 , wherein the work vehicle includes a drive shaft clutch disposed along the drive shaft, wherein the drive shaft clutch is configured to actuate between an engaged state to rotationally hold the drive shaft and disengaged state. 
   
   
       13 . The work vehicle of  claim 12 , wherein the work vehicle includes a hybrid drive control unit configured to:
 generate a hybrid drive control signal based upon torque and speed requirements of the vehicle.   
   
   
       14 . The work vehicle of  claim 13 , further comprising:
 a drive shaft clutch control unit configured to engage or disengage the drive shaft clutch based upon the hybrid drive control signal.   
   
   
       15 . The work vehicle of  claim 11 , wherein the work vehicle includes a power storage system. 
   
   
       16 . The work vehicle of  claim 15 , wherein the work vehicle includes a regenerative breaking system electrically coupled to the power storage system and disposed at the wheel. 
   
   
       17 . A vehicle comprising:
 a prime mover;   a first generator mechanically coupled to the prime mover;   a second generator mechanically coupled to the prime mover;   a first multi-input drive unit having at least first and second rotational inputs and at least one rotational output, wherein the first rotational input is coupled to the prime mover;   a first electric motor mechanically coupled to the second rotational input and electrically coupled to the first generator;   a first pair of vehicle drive wheels coupled to the rotational output;   a drive control unit configured to control the prime mover and the first electric motor and to generate a control signal based upon at least one of torque and speed requirements of the vehicle; and   a central tire inflation system coupled to the drive control unit and configured to regulate tire pressure based at least in part upon the control signal.   
   
   
       18 . The vehicle of  claim 17 , further comprising:
 a second multi-input drive unit having at least first and second rotational inputs and at least one rotational output, wherein the first rotational input of the second multi-input drive unit is coupled to the prime mover;   a second electric motor mechanically coupled to the second rotational input of the second multi-input drive unit and electrically coupled to the first generator; and   a second pair of vehicle drive wheels coupled to the rotational output of the second multi-input drive unit.   
   
   
       19 . The vehicle of  claim 18 , further comprising at least two axles, each having a differential to couple respective pairs of the drive wheels to the rotational outputs of the respective multi-input drive units. 
   
   
       20 . The vehicle of  claim 19 , further comprising four wheel end reductions each for coupling a respective drive wheel to its respective differential.