System and method for operating an electric motor by limiting performance
First Claim
1. A method of controlling a vehicle having a primary drivetrain and an auxiliary drivetrain, the primary drivetrain relying on fuel consumption to provide energy for driving the vehicle and the auxiliary drivetrain relying on stored electrical energy to provide energy for driving the vehicle, the method comprising:
- controlling the auxiliary drivetrain according to a first performance strategy when the primary drivetrain has a sufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain;
controlling the auxiliary drivetrain according to a second performance strategy when the primary drivetrain has an insufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain; and
wherein the second performance strategy includes setting a plurality of maximum vehicle speed and power ranges that are more restrictive than maximum vehicle speed and power ranges set according to the first performance strategy.
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Abstract
A method and system for limiting motor performance in a hybrid electric vehicle system. During a condition in a primary drivetrain, the method limits performance of an electric motor used in an auxiliary drivetrain to control energy consumed from a battery in the auxiliary drivetrain. A calculation or measurement is made to determine available battery energy remaining in the battery after the condition. The performance of the electric motor is then limited based on the available battery energy.
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Citations
13 Claims
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1. A method of controlling a vehicle having a primary drivetrain and an auxiliary drivetrain, the primary drivetrain relying on fuel consumption to provide energy for driving the vehicle and the auxiliary drivetrain relying on stored electrical energy to provide energy for driving the vehicle, the method comprising:
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controlling the auxiliary drivetrain according to a first performance strategy when the primary drivetrain has a sufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain; controlling the auxiliary drivetrain according to a second performance strategy when the primary drivetrain has an insufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain; and wherein the second performance strategy includes setting a plurality of maximum vehicle speed and power ranges that are more restrictive than maximum vehicle speed and power ranges set according to the first performance strategy. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a vehicle comprising:
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controlling an auxiliary drivetrain according to a first strategy when a primary drivetrain fuel supply permits re-charging the auxiliary drivetrain; controlling the auxiliary drivetrain according to a second strategy when the fuel supply prevents re-charging the auxiliary drivetrain, the second performance strategy setting a plurality of maximum power ranges that are more restrictive than maximum power ranges set according to the first performance strategy.
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9. A method of controlling a vehicle having a first, liquid fuel powered drivetrain and a second, electric energy powered drivetrain, the method comprising:
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determining a first amount of fuel available for powering the first drivetrain; setting operating parameters for controlling operations of the second drivetrain according to operating parameters specified by a first strategy when the first amount of fuel is above a fuel threshold; setting operating parameters for controlling operations of the second drivetrain according to operating parameters specified by a second strategy when the first amount of fuel is below the fuel threshold; determining the fuel threshold to at least equal an amount of fuel consumed by the first drivetrain to charge an energy source used to power the second drivetrain above a charging threshold; and wherein the second performance strategy includes setting a plurality of maximum vehicle speed and power ranges that are more restrictive than maximum vehicle speed and power ranges set according to the first performance strategy. - View Dependent Claims (10, 11, 12)
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13. A method of controlling a vehicle having a primary drivetrain and an auxiliary drivetrain, the primary drivetrain relying on fuel consumption to provide energy for driving the vehicle and the auxiliary drivetrain relying on stored electrical energy to provide energy for driving the vehicle, the method comprising:
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controlling the auxiliary drivetrain according to a first performance strategy when the primary drivetrain has a sufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain; controlling the auxiliary drivetrain according to a second performance strategy when the primary drivetrain has an insufficient supply of fuel to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain; and determining the supply of fuel needed to facilitate re-charging the stored electrical energy relied upon by the auxiliary drivetrain to at least equal an amount of fuel needed to charge an energy source that provides the stored electrical energy above a charge threshold.
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Specification