Hybrid electric vehicle control for minimizing high voltage battery power limits violations
First Claim
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1. A control system for a hybrid electric vehicle powertrain comprising:
- an engine and engine controller, a battery, a motor-generator, gearing establishing power flow paths to vehicle traction wheels, and a system controller for managing power distribution to the traction wheels to meet driver demand;
the system controller being configured to monitor vehicle operating conditions, to calculate an engine output power estimate and to command a traction torque based on estimated engine output power;
the engine output power estimate being determined by input variables including generator speed, motor speed and engine torque commands to the system controller;
the system controller being configured further to filter the estimated engine output power, to reduce torque disturbances in the power flow paths, and to develop a weight determination factor for modifying the engine output power estimate; and
the weight determination factor being adaptive to variable vehicle operating conditions, to satisfy driver torque demand while ensuring compliance with predetermined battery charge and discharge limits.
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Abstract
A control system and method for controlling a hybrid electric vehicle powertrain with mechanical and electro-mechanical power sources that use an intelligent controller adapted to reduce driveline oscillations while minimizing hybrid vehicle battery limit violations. Damping of driveline torque oscillations is accomplished and violations of battery power limits are avoided by filtering estimated engine power.
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Citations
19 Claims
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1. A control system for a hybrid electric vehicle powertrain comprising:
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an engine and engine controller, a battery, a motor-generator, gearing establishing power flow paths to vehicle traction wheels, and a system controller for managing power distribution to the traction wheels to meet driver demand; the system controller being configured to monitor vehicle operating conditions, to calculate an engine output power estimate and to command a traction torque based on estimated engine output power; the engine output power estimate being determined by input variables including generator speed, motor speed and engine torque commands to the system controller; the system controller being configured further to filter the estimated engine output power, to reduce torque disturbances in the power flow paths, and to develop a weight determination factor for modifying the engine output power estimate; and the weight determination factor being adaptive to variable vehicle operating conditions, to satisfy driver torque demand while ensuring compliance with predetermined battery charge and discharge limits. - View Dependent Claims (2, 3)
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4. A method for controlling a vehicle having an engine, generator, battery, and motor comprising:
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computing estimated engine output power based on at least one of generator speed, desired traction wheel torque and motor speed; filtering the estimated engine output power; and applying a weighting factor to the estimated engine output power, the weighting factor adaptive to variable vehicle operating conditions to satisfy driver torque demand while ensuring compliance with predetermined battery charge and discharge limits. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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5. A hybrid vehicle system, comprising:
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an engine coupled to a generator; and a controller that controls the engine and the generator based on an estimated engine output power computed using at least one of generator speed, desired wheel torque, and motor speed, filters the estimated engine output power, and applies a weighting factor based in part on driver torque demand to unfiltered and filtered engine output power estimates to meet the driver torque demand. - View Dependent Claims (6, 19)
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Specification