Spark retard control during cylinder transitions in a displacement on demand engine
First Claim
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1. An engine control system for calculating spark retard during cylinder deactivation for a displacement on demand engine, comprising:
- a torque reduction calculator that calculates a torque reduction signal based on desired and measured air per cylinder; and
a spark retard (RTD) calculator that generates a RTD signal based on said torque reduction signal; and
wherein said RTD signal is a negative offset from a minimum best torque.
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Abstract
An engine control system and method calculates spark retard during cylinder activation and deactivation for a displacement on demand engine. A torque reduction calculator calculates a torque reduction signal based on desired and measured air per cylinder. A spark retard (RTD) calculator generates a RTD signal based on the torque reduction signal.
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Citations
18 Claims
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1. An engine control system for calculating spark retard during cylinder deactivation for a displacement on demand engine, comprising:
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a torque reduction calculator that calculates a torque reduction signal based on desired and measured air per cylinder; and
a spark retard (RTD) calculator that generates a RTD signal based on said torque reduction signal; and
wherein said RTD signal is a negative offset from a minimum best torque. - View Dependent Claims (2, 3, 4)
a cylinder deactivation enable circuit for generating a cylinder deactivation enable signal; and
a selector for selecting one of a desired deactivated air per cylinder and an activated air per cylinder based on said cylinder deactivation enable signal.
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5. An engine control system for calculating spark retard during cylinder activation for a displacement on demand engine, comprising:
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a torque reduction calculator that calculates a torque reduction signal based on desired and measured air per cylinder;
a spark retard (RTD) calculator that generates a RTD signal based on said torque reduction signal;
an activation gain circuit for providing a gain signal;
a multiplier for generating a product by multiplying said signal by said torque reduction signal, wherein said product is input to said RTD calculator. - View Dependent Claims (6, 7, 8, 9, 10)
a cylinder reactivation circuit that generates a cylinder reactivation enable signal; and
a multiplier that generates a second product of said cylinder reactivation enable signal and said final RTD signal.
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10. The engine control system of claim 7 further comprising:
a multiplier that generates a second product of said cylinder reactivation enable signal and said final RTD signal.
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11. A method for calculating spark retard during cylinder deactivation for a displacement on demand engine, comprising:
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calculating a torque reduction signal based on desired and measured air per cylinder;
generating a spark retard (RTD) signal based on said torque reduction signal; and
wherein said RTD signal is a negative offset from a minimum best torque. - View Dependent Claims (12, 13, 14)
generating a cylinder deactivation enable signal; and
selecting one of a desired deactivated air per cylinder and a desired activated air per cylinder based on said cylinder deactivation enable signal.
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15. A method for calculating spark retard during cylinder activation for a displacement on demand engine, comprising:
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calculating a torque reduction signal based on desired and measured air per cylinder;
generating a RTD signal based on said torque reduction signal;
providing an activation gain signal;
generating a product by multiplying said gain signal by said torque reduction signal, wherein said product is input to said RTD calculator. - View Dependent Claims (16, 17, 18)
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Specification