Engine control for displacement on demand
First Claim
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1. An engine control system for controlling a displacement on demand engine having a plurality of cylinders, comprising:
- a torque converter with a torque converter clutch; and
a control module that determines a slip speed of said torque converter clutch and estimates a temperature state of said torque converter clutch based on said slip speed;
wherein said control module selectively activates at least one of said cylinders based on said temperature state.
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Abstract
An engine control system for controlling a displacement on demand engine having a plurality of cylinders includes a torque converter with a torque converter clutch. A control module determines a slip speed of said torque converter clutch, estimates a temperature state of said torque converter clutch based on said slip speed, and selectively activates at least one of said cylinders based on said temperature state.
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Citations
20 Claims
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1. An engine control system for controlling a displacement on demand engine having a plurality of cylinders, comprising:
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a torque converter with a torque converter clutch; and a control module that determines a slip speed of said torque converter clutch and estimates a temperature state of said torque converter clutch based on said slip speed; wherein said control module selectively activates at least one of said cylinders based on said temperature state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of controlling a displacement on demand engine having a plurality of cylinders in a vehicle having a torque converter with a torque converter clutch, said method comprising:
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determining a temperature state of said torque converter clutch; and selectively activating at least one of said cylinders based on said temperature state. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An engine control system for controlling a displacement on demand engine having a plurality of cylinders, comprising:
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a torque converter with a torque converter clutch; a sump for retaining a supply of fluid for said torque converter; a sump temperature sensor that generates a sump temperature signal based on a temperature of said sump; an engine rotational speed sensor that generates an engine rotational speed signal; a transmission input shaft speed sensor that generates a transmission input shaft speed signal; a solenoid that regulates a flow of fluid to said torque converter clutch; and a control module that monitors a slip speed of said torque converter clutch based on said engine rotational speed signal and said transmission input shaft speed signal, regulates a slip speed of said torque converter clutch by controlling a duty cycle of said solenoid, and estimates a temperature of said torque converter clutch based on said slip speed, said duty cycle, a predetermined thermal inertia of said torque converter clutch, and a predetermined heat rejection rate of said torque converter clutch; wherein said control module waits until said temperature state is greater than a predetermined temperature state threshold before reactivating at least one of said cylinders and waits until said temperature state is less than a predetermined temperature state threshold before deactivating at least one of said cylinders. - View Dependent Claims (20)
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Specification