SYSTEMS AND METHODS FOR CONTROL OF TRANSMISSION AND/OR PRIME MOVER

• US 20140257650A1
• Filed: 05/22/2014
• Published: 09/11/2014
• Est. Priority Date: 02/01/2007
• Status: Active Grant

• Current Assignee: Fallbrook Intellectual Property Company LLC (Fallbrook Technologies Incorporated)
• Original Assignee: Fallbrook Intellectual Property Company LLC (Fallbrook Technologies Incorporated)
• Inventors: Carter, Jeremy, Pohl, Brad P., McDaniel, Loren T., Keilers, Cyril, Ruggles, Tim, Diehl, Eric, Orand, Austin, Delz, Alan Mark, Parks, Paul Argus, Bartholomew, Mark Edward, Vasiliotis, Christopher M., Rogers, David Lynn
• Granted Patent: US 9,328,807 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2200/12 Bikes
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/642 Slope of road
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 50/20 using propulsion power generated by humans or animals
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/108 Friction gearings
• CPC Class Codes: B60W 10/109 of the toroïd type
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 2710/1005 Transmission ratio engaged
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60Y 2200/12 Motorcycles, Trikes; Quads; Scooters
• CPC Class Codes: B62M 6/45 : Control or actuating devices therefor
• CPC Class Codes: B62M 6/65 : with axle and driving shaft arranged coaxially
• CPC Class Codes: F16H 15/40 : in which two members co-operative by means of balls, or rollers of uniform effective diameter, not mounted on shafts
• CPC Class Codes: F16H 15/52 : in which a member of uniform effective diameter mounted on a shaft may co-operate with different parts of another member
• CPC Class Codes: F16H 61/6648 : controlling of shifting being influenced by a signal derived from the engine and the main coupling
• CPC Class Codes: F16H 61/6649 : characterised by the means for controlling the torque transmitting capability of the gearing
• CPC Class Codes: F16H 9/04 : using belts, V-belts, or ropes with toothed belts F16H9/24; pulleys of adjustable construction F16H55/52
• 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
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y10T 29/49002 : Electrical device making

Abstract

Disclosed here are inventive systems and methods for a powertrain of an electric vehicle (EV). In some embodiments, said powertrain includes a continuously variable transmission (CVT) coupled to an electric drive motor, wherein a control system is configured to control the CVT and/or the drive motor to optimize various efficiencies associated with the EV and/or its subsystems. In one specific embodiment, the control system is configured to operate the EV in an economy mode. Operating in said mode, the control system simultaneously manages the CVT and the drive motor to optimize the range of the EV. The control system can be configured to manage the current provided to the drive motor, as well as adjust a transmission speed ratio of the CVT. Other modes of operation are also disclosed. The control system can be configured to manage the power to the drive motor and adjust the transmission speed ratio of the CVT taking into account battery voltage, throttle position, and transmission speed ratio, for example.

Claims

1. A drive system comprising:

a continuously variable transmission (CVT) housed in a wheel hub;

a drive motor operably coupled to the CVT and configured to provide power to the CVT; and

an actuator motor coupled to the CVT and configured to adjust a transmission speed ratio of the CVT.

2. The drive system of claim 1, further comprising a transmission controller coupled to the actuator motor.

3. The drive system of claim 1, further comprising a drive motor controller coupled to the drive motor.

4. The drive system of claim 1, further comprising a controller configured to control both the drive motor and the actuator motor.

5. A control system for a drivetrain having a continuously variable transmission (CVT) and a drive motor, the control system comprising:

a controller having a microcontroller, a random access memory, and a flash memory;

a power control module configured to be in electrical communication with a power source and the controller, the power control module adapted to regulate a voltage;

a communication interface operably coupled to the power control module and the controller, the communication interface configured to connect to an external programming or data acquisition hardware;

a main drive module configured to communicate with the controller, the main drive module further configured to modulate electrical power provided to the drive motor; and

an actuator control module configured to communicate with the controller, the actuator control module operably coupled to the CVT.

6. The control system of claim 5, further comprising a test interface operably coupled to the power control module and the controller, the test interface configured to access the microcontroller, the random access memory, and the flash memory.

7. The control system of claim 5, further comprising a user interface configured to communicate with the controller.

8. A control system for a drivetrain having a continuously variable transmission (CVT), an actuator motor, and a drive motor, the control system comprising:

a transmission controller module configured to communicate with the actuator motor;

a drive motor controller module configured to communicate with the transmission controller module and the drive motor;

a throttle position sensor configured to communicate with the transmission controller;

a brake cut-off switch configured to communicate with the drive motor controller;

a wheel speed sensor configured to communicate with the transmission controller; and

an actuator position sensor configured to communicate with the transmission controller.

9. The control system of claim 8, wherein the drive motor controller module is configured to modulate a current level provided to the drive motor.

10. The control system of claim 9, wherein the current level is determined at least in part on a signal from the throttle position sensor.

11. The control system of claim 9, wherein the current level is determined at least in part on a signal from the actuator position sensor.

12. The control system of claim 9, wherein the current level is determined at least in part on a signal from the wheel speed sensor.

13. The control system of claim 8, wherein the transmission controller module is configured to control the actuator motor based at least in part on a signal from the actuator position sensor.

14. A method for manufacturing a drive system comprising:

providing a continuously variable transmission (CVT) having a plurality of tiltable spherical planets arranged radially about a longitudinal axis of the transmission;

providing a control system coupled to the CVT, the control system comprising

a mechanical actuator coupled to the CVT,

a controller configured to be in electrical communication with the mechanical actuator, the controller configured to control the mechanical actuator,

a data display configured to be in electrical communication with the controller, the data display having at least one button for selecting from a plurality of operating modes,

a plurality of sensors coupled to the controller, and

a shifter interface coupled to the mechanical actuator, the shifter interface configured to adjust the plurality of tiltable spherical planets; and

enclosing the CVT in a housing integrated into a wheel of an electric vehicle, the housing adapted to cooperate with the mechanical actuator, the mechanical actuator configured to adjust an angle of the tiltable spherical planets based at least in part on one of the plurality of operating modes and on an indication of transmission speed ratio of the CVT.

15. The method of claim 14, wherein the controller is configured to control the mechanical actuator based at least in part on data indicative of a transmission speed ratio and a vehicle speed.

16. The method of claim 15, wherein the plurality of sensors comprises a sensor configured to provide vehicle speed data.

17. The method of claim 16, wherein the plurality of sensors comprises a sensor configured to provide data associated with the transmission speed ratio of the CVT.

18. The method of claim 17, wherein the plurality of sensors comprises a sensor configured to provide data associated with a battery voltage.

19. The method of claim 17, wherein the plurality of sensors comprises a sensor configured to provide data associated with a current level provided to an electric drive motor.