Parallel hybrid drive system utilizing power take off connection as transfer for a secondary energy source
First Claim
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1. In a vehicle comprising an internal combustion engine connected through an automatic transmission to drive wheels of the vehicle, the automatic transmission having a power take off (PTO), a first end of the PTO being coupled to the automatic transmission, a parallel hybrid drive system comprising:
- an electric motor, an energy storage system and a vehicle monitoring and control system (VMCS); and
wherein the electric motor is connected through a short drive shaft to a second end of said PTO for bi-directional power flow, the electric motor being coupled to an accessory device, the accessory device being a rotating machine for transmitting fluid in response to rotation, the accessory device being attached to an end of the short drive shaft, the energy storage system connected to the electric motor for providing and receiving electric power to and from the electric motor, the vehicle monitoring and control system (VMCS) having a first, accelerating mode for delivering the electric power from said energy storage system to said electric motor to provide mechanical power through the PTO to said automatic transmission for supplementing the mechanical power from the internal combustion engine to the wheels of the vehicle and a second, deceleration mode for having said electric motor receive the mechanical power from the automatic transmission through the PTO while acting as a generator to provide regenerative braking and recharging the energy storage system, wherein the accessory device can be powered by rotation of the short drive shaft by the electric motor or by the PTO, wherein the vehicle monitoring and control system (VMCS) has a third, stationary mode for delivering power to the electric motor to rotate the short drive shaft for powering the accessory device in accordance with a power requirement during the third, stationary mode, wherein the automatic transmission comprises a torque converter and a gear box, the first end of the PTO being coupled between an input of the torque converter and the gear box, the torque converter operating in a locked state and at least one unlocked state, the first end being in a 1 to 1 ratio connection with a crankshaft of the internal combustion engine when the torque converter is in the locked state, wherein the torque converter operates in the at least one unlocked state during the second, deceleration mode to reduce losses.
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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.
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Citations
24 Claims
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1. In a vehicle comprising an internal combustion engine connected through an automatic transmission to drive wheels of the vehicle, the automatic transmission having a power take off (PTO), a first end of the PTO being coupled to the automatic transmission, a parallel hybrid drive system comprising:
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an electric motor, an energy storage system and a vehicle monitoring and control system (VMCS); and wherein the electric motor is connected through a short drive shaft to a second end of said PTO for bi-directional power flow, the electric motor being coupled to an accessory device, the accessory device being a rotating machine for transmitting fluid in response to rotation, the accessory device being attached to an end of the short drive shaft, the energy storage system connected to the electric motor for providing and receiving electric power to and from the electric motor, the vehicle monitoring and control system (VMCS) having a first, accelerating mode for delivering the electric power from said energy storage system to said electric motor to provide mechanical power through the PTO to said automatic transmission for supplementing the mechanical power from the internal combustion engine to the wheels of the vehicle and a second, deceleration mode for having said electric motor receive the mechanical power from the automatic transmission through the PTO while acting as a generator to provide regenerative braking and recharging the energy storage system, wherein the accessory device can be powered by rotation of the short drive shaft by the electric motor or by the PTO, wherein the vehicle monitoring and control system (VMCS) has a third, stationary mode for delivering power to the electric motor to rotate the short drive shaft for powering the accessory device in accordance with a power requirement during the third, stationary mode, wherein the automatic transmission comprises a torque converter and a gear box, the first end of the PTO being coupled between an input of the torque converter and the gear box, the torque converter operating in a locked state and at least one unlocked state, the first end being in a 1 to 1 ratio connection with a crankshaft of the internal combustion engine when the torque converter is in the locked state, wherein the torque converter operates in the at least one unlocked state during the second, deceleration mode to reduce losses. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A hybrid drive system connected to a shaft of a PTO, the shaft being on a first interface of the PTO, a second interface of the PTO being associated with an automatic transmission of a vehicle, wherein the automatic transmission includes a torque converter and a gear box and the second interface is provided between an input of the torque converter and the gear box, the hybrid drive system comprising:
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an electric motor in mechanical communication with the shaft; an energy storage system in electric communication with the electric motor; and a fluid pump in mechanical communication with the electric motor, wherein the fluid pump is attached to an end shaft of the electric motor, wherein the electric motor and the fluid pump are associated with the first interface of the PTO, wherein the electric motor is capable of providing mechanical power derived from electric energy in the energy storage system to said automatic transmission via the PTO and the electric motor is capable of receiving the mechanical power from the automatic transmission via the PTO to provide the electrical energy to the energy storage system, wherein the fluid pump can be powered via the electric motor or via the PTO.
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13. In a vehicle comprising an internal combustion engine connected through an automatic transmission to drive wheels of the vehicle, the automatic transmission having a power take off (PTO), a method of retrofitting the vehicle with a hybrid drive system comprising steps of:
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connecting an electric motor and a rotating machine for transmitting fluids to the PTO via a drive shaft, wherein the electric motor is part of the hybrid drive system comprising the electric motor and an energy storage system, the rotating machine being mounted on an end shaft of the electric motor, the drive shaft being attached to the PTO on a first end of the PTO, a second end of the PTO being attached to the automatic transmission; and controlling the hybrid drive system to use the electric motor to supplement drive power to the wheels of the vehicle through the PTO and providing regenerative braking through the PTO, wherein the rotating machine can be powered by rotation of the electric motor powered by the energy storage system and can be powered by rotation of the PTO whereby said energy storage system in the hybrid drive system is recharged by the regenerative braking. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification