Spark retard control during cylinder transitions in a displacement on demand engine
AssigneeGeneral Motors Corporation
InventorsAllen B. Rayl, Gregory Paul Matthews
Life of this patent
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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.
Claims22
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.
3 The engine control system of claim 1 further comprising a final RTD calculator that generates a final RTD signal based on said RTD signal, an MBT signal and a spark advance (SA) signal.
The engine control system of claim 3 wherein said final spark retard=−(MBT+RTD)−(MBT−SA).
An engine control system for calculating spark retard during cylinder activation 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;
- a spark retard (RTD) calculator that generates a RTD signal based on said torque reduction signal.
A method for calculating spark retard during cylinder deactivation for a displacement on demand engine, comprising:
- calculates a torque reduction signal based on desired and measured air per cylinder;
- and
- generates a spark retard (RTD) signal based on said torque reduction signal.
14 The method of claim 12 further comprising generating a final RTD signal based on said RTD signal, an MBT signal and a spark advance (SA) signal.
The method of claim 14 wherein said final spark retard=−(MBT+RTD)−(MBT−SA).
A method for calculating spark retard during cylinder activation for a displacement on demand engine, comprising:
- calculating a torque reduction signal based on desired and measured air per cylinder;
- generating a RTD signal based on said torque reduction signal.
Dependencies are inferred from the claim text.