Electric vehicle chassis controller

• US 5,508,594 A
• Filed: 06/10/1994
• Issued: 04/16/1996
• Est. Priority Date: 06/10/1994
• Status: Expired due to Term

• Current Assignee: Northrop Grumman Corporation
• Original Assignee: Westinghouse Electric Company LLC (Brookfield Asset Management Incorporated)
• Inventors: Underwood, Thomas C., Mohler, Eric L., Herman, Beth A.
• Primary Examiner(s): Ro, Bentsu
• Application Number:
  US08/258,628
• Time in Patent Office: 676 Days
• Field of Search: 318/139, 318/494, 318/504, 318/432, 318/433, 388/809, 388/816, 388/907.5, 180/65.1, 180/65.8, 320/2, 320/9, 320/10, 320/30, 320/31, 320/32, 320/35, 320/39, 364/424.01
• US Class Current: 318/139
• CPC Class Codes: B60L 3/00 Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00
• CPC Class Codes: B60L 50/60 using power supplied by batteries in combination with fuel cells B60L50/75
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 7/24 with additional mechanical or electromagnetic braking
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A vehicle power controller for a vehicle including a motor that drives the vehicle, a plurality of sensors and a motor controller, wherein the plurality of sensors includes an accelerator sensor for sensing a position of an accelerator pedal and a brake sensor for sensing a position of a brake pedal, and wherein the motor controller controls torque output of the motor. The vehicle power controller includes three components. The first receives signals from the accelerator sensor and the brake sensor. The second converts the signals for the accelerator sensor and the brake sensor into a torque value, and the third outputs the torque value to the motor controller for controlling the torque output of the motor.

Claims

1. A vehicle power controller for a vehicle including an electric motor that drives the vehicle, a plurality of sensors and a motor controller, wherein the plurality of sensors includes an accelerator sensor for sensing a position of an accelerator pedal and a brake sensor for sensing a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the vehicle power controller comprising:

means for receiving signals from the accelerator sensor and the brake sensor;

means for comparing multiple accelerator sensor signals to thereby generate an accelerator torque value;

means for comparing multiple braking sensor signals to thereby generate a braking torque value;

means for combining the accelerator torque value and the braking torque value to thereby generate a current torque value; and

means for outputting the current torque value to the motor controller for controlling the torque output of the motor.

2. A vehicle power controller for a vehicle including a battery, an electric motor that drives the vehicle, a plurality of sensors, and a motor controller, wherein the plurality of sensors includes a battery sensor for sensing a state-of-charge of the battery, an accelerator sensor for sensing a position of an accelerator pedal and a brake sensor for sensing a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the vehicle power controller comprising:

means for receiving signals from the plurality of sensors;

means for converting the accelerator sensor signal to an accelerator torque value, the battery sensor signal to a battery torque value, and the braking sensor signal to a braking torque value;

means for generating a current torque value based on said battery torque value, said accelerator torque value and said braking torque value; and

means for outputting the current torque value to the motor controller for controlling the torque output of the motor.

3. A vehicle power controller for a vehicle that includes a battery, an electric motor that drives the vehicle, a plurality of sensors, and a motor controller, wherein the vehicle is capable of moving in either a forward direction or a reverse direction, wherein the plurality of sensors includes a drive selector sensor that senses a current drive-state of the vehicle corresponding to whether the vehicle is moving the forward direction or the reverse direction, a battery sensor that senses a state-of-charge of the battery, an accelerator sensor that senses a position of an accelerator pedal and a brake sensor that senses a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the vehicle power controller comprising:

means for receiving signals from the plurality of sensors;

means for converting the signals for the plurality of sensors into a torque value; and

means for outputting the torque value to the motor controller for controlling the torque output of the motor,

wherein said torque value is a negative value when said battery sensor signal indicates that the battery needs charging and said drive selector sensor signal indicates that the current drive-state is forward, and wherein said torque value is negative when said battery sensor signal indicates that the battery needs charging and said drive selector sensor signal indicates that the current drive-state is reverse.

4. The vehicle power controller of claim 3 wherein the converting means comprises first means for determining whether the signal for the battery sensor indicates that the battery does or does not need charging.

5. The vehicle power controller of claim 4 wherein the converting means further comprises second means for determining whether the signal for the drive selector sensor indicates that the current drive-state of the vehicle is in the forward or reverse direction.

6. The vehicle power controller of claim 5 wherein when the first determining means determines that the signal for the battery sensor indicates that the battery does not need charging and the second determining means determines that the current drive-state of the vehicle is the forward direction, then the torque value is a positive value.

7. The vehicle power controller of claim 5 wherein when the first determining means determines that the signal for the battery sensor indicates that the battery does not need charging and second determining means determines that the signal for the drive selector sensor indicates that the current drive-state of the vehicle is in the reverse direction then the torque value is a negative value.

8. The vehicle power controller of claim 3 the vehicle power controller further comprising:

means for receiving a signal from the motor controller indicating an rpm value for the motor; and

means for converting the signal received from the motor controller into a value corresponding to a current speed of the vehicle.

9. The vehicle power controller of claim 8 further comprising:

means for outputting the value for the current speed of the vehicle.

10. The vehicle power controller of claim 3, wherein a diagnostic device is connectable to vehicle power controller, the vehicle power controller further comprising:

means for receiving a BIT signal from at least one of the diagnostic device and the motor controller; and

means for processing a BIT test corresponding to the BIT signal.

11. The vehicle power controller of claim 10 further comprising:

means for outputting a result for the BIT test to at least one of the diagnostic device and the motor controller.

12. The vehicle power controller of claim 11 further comprising:

means for determining a BIT source corresponding to whether the BIT signal was received by the receiving means from the diagnostic device or the motor controller; and

means for outputting a result for the BIT test to the BIT source.

13. A vehicle power controller for a vehicle that includes a battery, an electric motor that drives the vehicle, a plurality of analog sensors, a plurality of digital sensors, and a motor controller, wherein the vehicle is capable of moving in either a forward direction or a reverse direction, wherein the plurality of analog sensors includes a battery sensor that senses a state-of-charge of the battery, an accelerator sensor that senses a position of an accelerator pedal and a brake sensor that senses a position of a brake pedal, wherein the digital sensors include a drive selector sensor that senses a current drive-state of the vehicle corresponding to whether the vehicle is moving the forward direction or the reverse direction, and wherein the motor controller controls torque output of the motor, the vehicle power controller comprising:

means for receiving signals from the plurality of analog sensors;

means for converting the signals for the plurality analog sensors into a plurality of digital signals;

means for determining a torque value using the plurality of digital signals; and

means for outputting the torque value to the motor controller for controlling the torque output of the motor,

wherein said torque value is negative when the battery sensor signal indicates that the battery needs charging and the drive selector sensor signal indicates that the current drive-state is forward.

14. The vehicle power controller of claim 13 wherein the determining means comprises:

means for receiving a digital drive signal from the drive selector sensor;

first means for determining whether the battery needs charging using the digital signal corresponding to the converted signal for the battery sensor; and

second means for determining the current drive-state of the vehicle from the digital drive signal.

15. The vehicle power controller of claim 14 wherein when the first determining means determines that the battery needs charging and the second determining means determines that the current drive-state of the vehicle is in the reverse direction then the torque value is a positive value.

16. The vehicle power controller of claim 14 wherein the motor charges the battery when the first determining means determines that the battery needs charging.

17. The vehicle power controller of claim 14 wherein when the first determining means determines that the battery does not need charging and the second determining means determines that the current drive-state of the vehicle is in the forward direction then the torque value is a positive value.

18. The vehicle power controller of claim 14 wherein when it is determined that the battery does not need charging and the current drive-state of the vehicle is in the reverse direction then the torque value is a negative value.

19. A computer-implemented method for controlling propulsion of a vehicle including an electric motor that drives the vehicle, a plurality of sensors, a microprocessor, and a motor controller, wherein the plurality of sensors includes an accelerator sensor for sensing a position of an accelerator pedal and a brake sensor for sensing a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the method comprising the steps of:

receiving signals from the accelerator sensor and the brake sensor;

comparing multiple accelerator sensor signals to thereby generate an accelerator torque value;

comparing multiple braking sensor signals to thereby generate a braking torque value;

combining the accelerator torque value and the braking torque value to thereby generate a current torque value; and

outputting the current torque value to the motor controller for controlling the torque output of the motor.

20. A computer-implemented method for controlling propulsion of a vehicle including a battery, an electric motor that drives the vehicle, a plurality of sensors, a microprocessor, and a motor controller, wherein the plurality of sensors includes a battery sensor for sensing a state-of-charge of the battery, an accelerator sensor for sensing a position of an accelerator pedal and a brake sensor for sensing a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the method comprising the steps of:

receiving signals from the plurality of sensors;

converting the accelerator sensor signal to an accelerator torque value, the battery sensor signal to a battery torque value, and the braking sensor signal to a braking torque value;

generating a torque value based on said battery torque value, said accelerator torque value and said braking torque value; and

outputting the torque value to the motor controller for controlling the torque output of the motor.

21. A computer-implemented method for controlling propulsion of a vehicle that includes a battery, an electric motor that drives the vehicle, a plurality of sensors, a microprocessor, and a motor controller, wherein the vehicle is capable of moving in either a forward direction or a reverse direction, wherein the plurality of sensors includes a drive selector sensor that senses a current drive-state of the vehicle corresponding to whether the vehicle is moving the forward direction or the reverse direction, a battery sensor that senses a state-of-charge of the battery, an accelerator sensor that senses a position of an accelerator pedal and a brake sensor that senses a position of a brake pedal, and wherein the motor controller controls torque output of the motor, the method comprising the steps of:

receiving signals from the plurality of sensors;

converting the signals for the plurality sensors into a torque value; and

outputting the torque value to the motor controller for controlling the torque output of the motor,

wherein said torque value is a negative value when said battery sensor signal indicates that the battery needs charging and said drive selector sensor signal indicates that the current drive-state is forward, and wherein said torque value is negative when said battery sensor signal indicates that the battery needs charging and said drive selector sensor signal indicates that the current drive-state is reverse.

22. The method of claim 21 wherein the converting step includes the substep of:

determining whether the signal for the battery sensor indicates that the battery does or does not need charging.

23. The method of claim 22 wherein the converting steps includes the substep of:

determining whether the signal for the drive selector sensor indicates that the current drive-state of the vehicle is in the forward or reverse direction.

24. The method of claim 23 wherein when it is determined that the signal for the battery sensor indicates that the battery does not need charging and that the current drive-state of the vehicle is the forward direction, then the torque value is a positive value.

25. The method of claim 23 wherein when it is determined that the signal for the state-of-charge indicates that the battery does not need charging and that the signal for the drive selector sensor indicates that the current drive-state of the vehicle is in the reverse direction then the torque value is a negative value.

26. The method of claim 21 further comprising:

receiving a signal from the motor controller indicating an rpm value for the motor; and

converting the signal received from the motor controller into a value corresponding to a current speed of the vehicle.

27. The method of claim 26 further comprising:

outputting the value for the current speed of the vehicle.

28. The method of claim 21, wherein a diagnostic device is connectable to vehicle power controller, the method further comprising the steps of:

receiving a BIT signal from at least one of the diagnostic device and the motor controller; and

processing a BIT test corresponding to the BIT signal.

29. The method of claim 28 further comprising the steps of:

outputting a result for the BIT test to at least one of the diagnostic device and the motor controller.

30. The method of claim 29 further comprising the steps of:

determining a BIT source corresponding to whether the BIT signal was received by the receiving means from the diagnostic device or the motor controller; and

outputting a result for the BIT test to the BIT source.

31. A computer-implemented method for controlling propulsion of a vehicle that includes a battery, an electric motor that drives the vehicle, a plurality of analog sensors, a plurality of digital sensors, a microprocessor, and a motor controller, wherein the vehicle is capable of moving in either a forward direction or a reverse direction, wherein the plurality of analog sensors includes a battery sensor that senses a state-of-charge of the battery, an accelerator sensor that senses a position of an accelerator pedal and a brake sensor that senses a position of a brake pedal, wherein the digital sensors include a drive selector sensor that senses a current drive-state of the vehicle corresponding to whether the vehicle is moving the forward direction or the reverse direction, and wherein the motor controller controls torque output of the motor, the method comprising the steps of:

receiving signals from the plurality of analog sensors;

converting the signals for the plurality analog sensors into a plurality of digital signals;

determining a torque value using the plurality of digital signals; and

outputting the torque value to the motor controller for controlling the torque output of the motor;

wherein said torque value is negative when the battery needs charging and the drive-state is forward.

32. The method of claim 31 wherein the determining step comprises:

receiving a digital drive signal from the drive selector sensor;

determining whether the battery needs charging using the digital signal corresponding to the converted signal for the battery sensor; and

determining the current drive-state of the vehicle from the digital drive signal.

33. The method of claim 32 wherein when it is determined that the battery needs charging and that the current drive-state of the vehicle is in the reverse direction then the torque value is a positive value.

34. The method of claim 32 wherein the motor charges the battery when it is determined that the battery needs charging.

35. The method of claim 32 wherein when it is determined that the battery does not need charging and that the current drive-state of the vehicle is in the forward direction then the torque value is a positive value.

36. The method of claim 32 wherein when it is determined that the battery does not need charging and the current drive-state of the vehicle is in the reverse direction then the torque value is a negative value.