Cylinder deactivation torque limit for noise, vibration, and harshness
First Claim
1. An engine control system for controlling the engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active, comprising:
- a noise vibration and harshness (NVH) limit module that determines a noise, vibration, and harshness (NVH) torque limit based on the engine speed and the vehicle speed; and
a mode transition module that enables the engine to transition from the activated mode to the deactivated mode while limiting noise, vibration, and harshness based on a comparison of the NVH torque limit minus a hysteresis and a requested torque.
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Abstract
An engine control system for controlling the engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active is provided. The system includes: a noise vibration and harshness (NVH) limit module that determines a noise, vibration, and harshness (NVH) torque limit based on the engine speed and the vehicle speed; and a mode transition module that enables the engine to transition between the deactivated mode and the activated mode while limiting noise, vibration, and harshness based on the NVH torque limit and a requested torque.
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Citations
10 Claims
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1. An engine control system for controlling the engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active, comprising:
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a noise vibration and harshness (NVH) limit module that determines a noise, vibration, and harshness (NVH) torque limit based on the engine speed and the vehicle speed; and a mode transition module that enables the engine to transition from the activated mode to the deactivated mode while limiting noise, vibration, and harshness based on a comparison of the NVH torque limit minus a hysteresis and a requested torque. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of controlling an internal combustion engine to transition between an activated mode where all cylinders are active and a deactivated mode where less than all cylinders are active, comprising:
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determining a noise, vibration, and harshness (NVH) torque limit based on engine speed and vehicle speed; and controlling the engine to transition from the activated mode to the deactivated mode while limiting NVH if a requested torque is less than the NVH torque limit minus a hysteresis. - View Dependent Claims (8, 9, 10)
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Specification