Electric drive vehicle retrofit system and associated method
First Claim
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1. A system for retrofitting an electrically propelled vehicle having an engine-driven generator, and at least a first traction motor coupled to the generator and a second traction motor, comprising:
- a control system for controlling a distribution of propulsive power between the first traction motor and the second traction motor, wherein;
the control system controls the vehicle at a first speed, at a first torque, and both at the first speed and the first torque, by using the second traction motor alone in one mode of operation, and by using the second traction motor in combination with the first traction motor in another mode of operation;
the control system controls the vehicle at a second torque and a second speed by using the first traction motor, wherein the second speed is higher than the first speed and the second torque is lower than the first torque; and
an energy storage device coupled to at least the second traction motor;
the control system initiates a braking event calling for an amount of a required braking power for a vehicle having an electric motor that can drive a wheel, and having an energy storage device, an electric converter, and a power switch coupled to the electric motor;
the control system determines a first available braking power based on a component limiting factor determined by at least one of;
power capacity of the electric motor, torque capacity of the electric motor, maximum adhesion limit of the wheel on a wheel-bearing surface, electrical uptake capacity of the energy storage device, electrical rating capacity of the electronic converter, or electrical rating capacity of the power switch;
the control system compares the first available braking power to the required braking power;
the control system meets the required braking power first with the first available braking power; and
the control system supplements the first available braking power with a second available braking power where the first available braking power is insufficient to meet the required braking power, and the second available braking power is based on at least a capacity of a dynamic braking grid resistor array coupled thereto.
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Abstract
A system is provided for retrofitting an electrically propelled vehicle. The vehicle has an engine-driven generator, and at least a first traction motor and a second traction motor coupled to the generator. The system includes an energy storage device capable of being coupled to at least the first traction motor; and a control system operable to control a distribution of propulsive power between the first traction motor and the second traction motor. An associated method and a retrofit kit are provided, also.
55 Citations
19 Claims
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1. A system for retrofitting an electrically propelled vehicle having an engine-driven generator, and at least a first traction motor coupled to the generator and a second traction motor, comprising:
a control system for controlling a distribution of propulsive power between the first traction motor and the second traction motor, wherein; the control system controls the vehicle at a first speed, at a first torque, and both at the first speed and the first torque, by using the second traction motor alone in one mode of operation, and by using the second traction motor in combination with the first traction motor in another mode of operation; the control system controls the vehicle at a second torque and a second speed by using the first traction motor, wherein the second speed is higher than the first speed and the second torque is lower than the first torque; and
an energy storage device coupled to at least the second traction motor;the control system initiates a braking event calling for an amount of a required braking power for a vehicle having an electric motor that can drive a wheel, and having an energy storage device, an electric converter, and a power switch coupled to the electric motor; the control system determines a first available braking power based on a component limiting factor determined by at least one of;
power capacity of the electric motor, torque capacity of the electric motor, maximum adhesion limit of the wheel on a wheel-bearing surface, electrical uptake capacity of the energy storage device, electrical rating capacity of the electronic converter, or electrical rating capacity of the power switch;the control system compares the first available braking power to the required braking power; the control system meets the required braking power first with the first available braking power; and the control system supplements the first available braking power with a second available braking power where the first available braking power is insufficient to meet the required braking power, and the second available braking power is based on at least a capacity of a dynamic braking grid resistor array coupled thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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