ENGINE AND EXHAUST HEATING FOR HYBRID VEHICLE
First Claim
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1. A method for a vehicle engine having a plurality of cylinders and an electric motor configured to rotate the engine, comprising:
- during engine idling,advancing spark timing of a cylinder to substantially before a peak torque timing,adjusting motor torque output of the electric motor to maintain engine idle speed, andretarding the spark timing of the cylinder toward the peak torque timing in response to a decrease in engine speed.
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Abstract
A method for controlling a vehicle engine having a plurality of cylinders and an electric motor configured to rotate the engine is provided. The method includes, during engine idling, advancing spark timing of at least one cylinder to substantially before a peak torque timing. The method further includes adjusting motor torque output of the electric motor to maintain engine idle speed.
44 Citations
20 Claims
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1. A method for a vehicle engine having a plurality of cylinders and an electric motor configured to rotate the engine, comprising:
- during engine idling,
advancing spark timing of a cylinder to substantially before a peak torque timing, adjusting motor torque output of the electric motor to maintain engine idle speed, and retarding the spark timing of the cylinder toward the peak torque timing in response to a decrease in engine speed. - View Dependent Claims (2, 4, 5, 6, 7, 18, 19)
- during engine idling,
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3. (canceled)
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8. A method for controlling an engine of a vehicle having a motor configured to drive at least the engine, the method comprising:
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cold staffing an engine; during a first idle speed control mode when catalyst temperature is below a first predetermined threshold, setting a spark timing to a first nominal timing retarded from a peak torque timing, and adjusting spark timing about the first nominal timing while maintaining spark timing retarded from the peak torque timing, said adjusting including advancing spark timing from the first nominal timing in response to decreases in idle engine speed; and during a second idle speed control mode when catalyst temperature is above the first predetermined threshold and engine coolant temperature is below a second predetermined threshold, setting the spark timing to a second nominal timing substantially advanced from the peak torque timing such that engine cylinders generate output torque insufficient to maintain rotation of the engine at idle speed, and adjusting output of the motor in response to engine speed to maintain idle speed while maintaining spark timing advanced from the peak torque timing. - View Dependent Claims (9, 10, 11, 12, 13, 14, 20)
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15. A method for controlling a hybrid propulsion system of a vehicle having an engine with a plurality of cylinders, comprising:
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during engine idling, in a first mode, advancing spark timing of at least one cylinder to before a peak torque timing, and engaging a motor of the hybrid propulsion system to maintain idling speed; during engine idling, in a second mode, advancing spark timing of at least one cylinder to an advanced timing before the peak torque timing, but less advanced than in the first mode, and retarding spark timing from the advanced timing toward the peak torque timing in response to decreased engine speed to maintain idling speed; during engine idling, in a third mode, retarding spark timing of at least one cylinder to a retarded timing after the peak torque timing, and advancing spark timing from the retarded timing toward the peak torque timing in response to decreased engine speed to maintain idling speed; and selecting among at least the first, second, and third modes responsive to battery state of charge, catalyst temperature, and cabin heating demands. - View Dependent Claims (16)
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17. A method for controlling a vehicle engine having a plurality of cylinders and an electric motor configured to rotate the engine, comprising:
during engine operation, advancing spark timing of at least one cylinder to substantially before a peak torque timing, retarding spark timing of at least a second cylinder to substantially after the peak torque timing, and adjusting motor torque output of the electric motor to maintain engine idle speed.
Specification