STRATEGY FOR MAPPING MOTOR SPEED TO CALCULATE DRIVER POWER DEMAND IN A HYBRID ELECTRIC VEHICLE
First Claim
Patent Images
1. A hybrid electric vehicle powertrain including an engine, a motor/generator and battery sub-system and a controller;
- the engine defining in part a mechanical power flow path to a driveshaft for a traction wheel-and-axle assembly;
the sub-system defining in part an electro-mechanical power flow path to the traction wheel-and-axle assembly driveshaft whereby engine power is complemented by electrical power;
the sub-system having an electric motor drivably connected to the driveshaft;
the controller responding to a drive torque demand by determining engine power required to satisfy the driver demand for driver torque;
the engine power determined by the controller being a function of actual motor speed and torque at motor speeds greater than a predetermined value; and
the engine power determined by the controller being a function of a calibrated motor speed of non-zero value at actual motor speeds less than the predetermined value.
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Abstract
A controller and a control method is disclosed for determining a power demand for an engine in a hybrid electric vehicle powertrain. In computing engine power demand, a modified motor speed is used at zero and near-zero actual motor speeds to satisfy a driver demand for vehicle traction wheel torque.
19 Citations
11 Claims
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1. A hybrid electric vehicle powertrain including an engine, a motor/generator and battery sub-system and a controller;
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the engine defining in part a mechanical power flow path to a driveshaft for a traction wheel-and-axle assembly;
the sub-system defining in part an electro-mechanical power flow path to the traction wheel-and-axle assembly driveshaft whereby engine power is complemented by electrical power;
the sub-system having an electric motor drivably connected to the driveshaft;
the controller responding to a drive torque demand by determining engine power required to satisfy the driver demand for driver torque;
the engine power determined by the controller being a function of actual motor speed and torque at motor speeds greater than a predetermined value; and
the engine power determined by the controller being a function of a calibrated motor speed of non-zero value at actual motor speeds less than the predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for coordinating power delivery from an engine and an electric motor in a hybrid electric vehicle powertrain to meet a driver'"'"'s demand for vehicle driving torque, the vehicle having traction wheels drivably connected mechanically to the engine and to the motor whereby a mechanical power flow path and an electro-mechanical power flow path are established, the method comprising:
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setting predetermined power limits of the electromechanical power flow path;
measuring actual motor speed; and
using a calibrated motor speed of small non-zero value when the actual motor speed is less than a predetermined value. - View Dependent Claims (8, 9, 10, 11)
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Specification