Engine control systems and methods for minimizing fuel consumption
First Claim
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1. An engine control system comprising:
- a first electronic circuit configured to regulate a first temperature of an electrically heated catalyst (EHC) based on a first predetermined light-off temperature while an engine is shut down; and
a second electronic circuit configured to;
selectively startup the engine;
selectively disable the startup of the engine when both;
a first determination that a second temperature of a passive catalyst is less than a second predetermined light-off temperature; and
a second determination that a maximum torque output of an electric motor is greater than a desired torque output; and
after the startup, shut down the engine when both;
a third determination that the second temperature is less than the second predetermined light-off temperature; and
a fourth determination that the maximum torque output is greater than the desired torque output,the shutdown stopping rotation of the engine.
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Abstract
An engine control system comprises a temperature control module and an engine disabling module. The temperature control module regulates a first temperature of an electrically heated catalyst (EHC) based on a first predetermined light-off temperature while an engine is shut down. The engine disabling module selectively disables start up of the engine when a second temperature of a passive catalyst is less than a second predetermined light-off temperature while a maximum torque output of an electric motor is greater than a desired torque output.
68 Citations
16 Claims
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1. An engine control system comprising:
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a first electronic circuit configured to regulate a first temperature of an electrically heated catalyst (EHC) based on a first predetermined light-off temperature while an engine is shut down; and a second electronic circuit configured to; selectively startup the engine; selectively disable the startup of the engine when both; a first determination that a second temperature of a passive catalyst is less than a second predetermined light-off temperature; and a second determination that a maximum torque output of an electric motor is greater than a desired torque output; and after the startup, shut down the engine when both; a third determination that the second temperature is less than the second predetermined light-off temperature; and a fourth determination that the maximum torque output is greater than the desired torque output, the shutdown stopping rotation of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 16)
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8. A method comprising:
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regulating a first temperature of an electrically heated catalyst (EHC) based on a first predetermined light-off temperature while an engine is shut down; selectively initiating a startup of the engine; selectively disabling the startup of the engine when both; a second temperature of a passive catalyst is less than a second predetermined light-off temperature; and a maximum torque output of an electric motor is greater than a desired torque output; and after the startup, shutting down the engine when both; the second temperature is less than the second predetermined light-off temperature; and the maximum torque output is greater than the desired torque output, the shutting down of the engine stopping rotation of the engine. - View Dependent Claims (9, 10, 11, 12, 13, 15)
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Specification