Parallel hybrid drive system utilizing power take off connection as transfer for a secondary energy source

• US 20090018716A1
• Filed: 07/03/2008
• Published: 01/15/2009
• Est. Priority Date: 07/12/2007
• Status: Active Grant

• Current Assignee: Power Technology Holdings LLC
• Original Assignee: Odyne Systems, LLC
• Inventors: Ambrosio, Joseph Mario
• Granted Patent: US 8,818,588 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 17/28 characterised by arrangement, location, or type of power take-off
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/006 to power outlets
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2200/18 Buses
• CPC Class Codes: B60L 2200/36 Vehicles designed to transport cargo, e.g. trucks
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/443 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/20 : having different nominal voltages
• CPC Class Codes: B60L 58/21 : having the same nominal voltage
• CPC Class Codes: B60L 7/14 : for vehicles propelled by ac motors
• CPC Class Codes: B60W 10/023 : Fluid clutches
• CPC Class Codes: B60W 10/06 : including control of combustion engines
• CPC Class Codes: B60W 10/08 : including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/30 : including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 20/00 : Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2510/0604 : Throttle position
• 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 30/1888 : Control of power take off [PTO]
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility

Abstract

A parallel hybrid vehicle system utilizing the Power Take Off connection on an automatic transmission as a transfer port for a secondary device is described for both driving modes and stationary operation. The secondary device is a battery powered electric motor providing motive power or regenerative braking in driving mode or providing power to accessories typically mounted to a conventional PTO while stationary.

Claims

1. In a vehicle power drive system, the combination comprising:

an internal combustion engine connected through a transmission to drive wheels of said vehicle;

said transmission having a power take off (PTO) and PTO output gear;

a parallel hybrid drive system connected to said PTO comprising an electric motor, an energy storage system and a vehicle monitoring and control system (VMCS);

said electric motor connected through a shaft to said PTO for bi-directional power flow;

said electric motor having an accessory device;

said energy storage system connected to said electric motor for sending and receiving electric power;

said vehicle monitoring and control system (VMCS) having a first, accelerating mode for delivering electric power from said energy storage system to said electric motor to provide drive power to said transmission for supplementing drive power being delivered by said engine to said wheels of said vehicle and a second, deceleration mode having said electric motor receive shaft power from said PTO while acting as a generator to provide regenerative braking and recharging said energy storage system when said engine is not delivering power to said wheels, wherein further said PTO can be disengaged from the transmission, allowing said electric motor to freely provide power to the said accessory device from the said energy storage system.

2. The vehicle power system as in claim 1, wherein said accessory device is selected from the group consisting of a hydraulic pump, an air compressor and a mounted accessory.

3. The vehicle power drive system of claim 1 in which said PTO is connected to a PTO output gear in said transmission.

4. The vehicle power drive system of claim 1 in which energy storage system comprises a battery pack, a battery charger for charging said battery pack using an outside electric power source, and a battery management system.

5. The vehicle power drive system of claim 1 in which said electric motor has an auxiliary power take off.

6. The vehicle power drive system of claim 5 in which said auxiliary power take off is disengaged when said VMCS is in said first mode.

7. The vehicle power drive system of claim 6 in which said VMCS includes a dampening function to reduce vibration and gear backlash in said PTO when engaging either switching mode, said dampening function monitoring the velocity and direction of said electric motor and said PTO output gear and adjusting the velocity and speed of the said electric motor, thereby creating a closed-loop feedback loop to ensure smooth and efficient operation of said vehicle power drive system.

8. The vehicle power drive system of claim 7 in which said electric motor is a permanent magnet motor providing additional torque during said first mode and more regenerative power in said second mode.

9. The vehicle power drive system of claim 8 in which said VMCS monitors accelerator pedal position, engine throttle position, battery voltage, vehicle speed, and torque request to determine amount and frequency of power being applied to said PTO for maintaining vehicle drivability and optimize overall efficiency.

10. The vehicle power drive system of claim 9 in which said hybrid system has a high voltage DC connection center between said energy storage system and an inverter for said electric motor for controlling electric power flow between said energy storage system and said electric motor.

11. The vehicle power drive system of claim 10 in which said VMCS has a third park/neutral mode in which said electric motor recharges said battery pack.

12. The vehicle power drive system of claim 11 in which said VMCS has a fourth, all-electric stationary mode with said engine shut down in which said electric motor operates said auxiliary power take off.

13. In a vehicle power drive system comprising an internal combustion engine connected through a transmission to drive wheels of said vehicle, said transmission having a power take off (PTO), the method of retrofitting said drive system comprising the steps of:

connecting a parallel hybrid drive system to said PTO through a bi-directional power flow shaft, said parallel hybrid drive system comprising an electric motor, a energy storage system, and an vehicle monitoring and control system (VMCS); and

said VMCS controlling said parallel hybrid drive system to use said electric motor to supplement drive power to said wheels of said vehicle when said internal combustion engine is driving said wheels and providing regenerative braking when said engine is not delivering power to said wheels whereby said battery in said parallel hybrid drive system is recharged.

14. The method of claim 13 including the step of connecting said PTO to a torque converter in said transmission.

15. The method of claim 13 including the step of recharging said energy storage system using an outside electric power source.

16. The method of claim 15 including the step of withdrawing auxiliary power from said electric motor when said electric motor is recharging said energy storage system.

17. The method of claim 16 including the step of disengaging said auxiliary power take off when said electric motor is delivering shaft power to said transmission.

18. The method of claim 17 in which said VMCS uses a dampening function to reduce vibration in said PTO when switching between supplemental drive power and regenerative braking.

19. The method of claim 18 in which said VMCS monitors accelerator pedal position, engine throttle position, battery voltage, vehicle speed, and torque request to determine amount and frequency of power being applied to said PTO for maintaining vehicle drivability and optimize overall efficiency.

20. The method of claim 19 in which said hybrid system uses a high voltage DC connection center between said energy storage system and an inverter for said electric motor for controlling electric power flow between said energy storage system and said electric motor.

21. The method of claim 20 in which said electric motor recharges said energy storage system during park or neutral position of said transmission.

22. The method of claim 19, wherein said VMCS provides a method for tuning the amount of power provided for launch assist and regenerative braking power applied in the forward and/or reverse direction, wherein further said VMCS has a tuning chart for the setting provided for each gear, said settings including pedal position vs. positive or negative torque applied, battery voltage vs torque provided, torque provided vs. state of charge (SOC), and driver inputs including system disable.

23. The method of claim 19, wherein said system shifts through each gear, the transmission provides a signal over said vehicle data network to wherein said VMCS in order to provide advanced notice of a shift event, wherein further based upon this information and the pedal position, said VMCS can increase or decrease the power provided to said electric motor, allowing for smoother and more efficient shifting, hereby enhancing the vehicle ride and reducing fuel consumption.

24. The method as in claim 19 wherein said VMCS also further interfaces with an original equipment manufacturers (OEM) vehicle data system in order to eliminate or reduce regenerative braking based on anti-lock or traction control events.