Systems and methods for reducing noise, vibration and/or harshness associated with cylinder deactivation in internal combustion engines
AssigneePACCAR Inc
InventorsMichael D. Gerty, Uday Vadlamani, Kimberly D. McKinnon
Life of this patent
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Abstract
In some embodiments of the present disclosure, an electric motor is used to generate correction torques to counteract unwanted torque pulses generated by an internal combustion engine during a cylinder deactivation mode. In some embodiments, the electric motor may be mounted to an accessory drive such as a power take-off mechanism or a front end accessory drive (FEAD). In some embodiments, the correction torques may be determined using an engine model. The correction torques help to reduce or eliminate noise, vibration, and/or harshness (NVH) during the cylinder deactivation mode.
Claims19
A vehicle, comprising:
- an internal combustion engine;
- an electric motor;
- an accessory drive having a drive shaft and an output shaft, wherein the drive shaft of the accessory drive is coupled to an output of the internal combustion engine, and the output shaft of the accessory drive is coupled to the electric motor;
- and
- an electronic control unit (ECU) configured to:
- initiate a cylinder deactivation mode for the internal combustion engine;
- monitor engine state values of the engine;
- determine a correction torque to compensate for torque pulses generated by the engine during the cylinder deactivation mode;
- and
- cause the electric motor to generate the correction torque to counteract vibration induced by the internal combustion engine during the cylinder deactivation mode.
A non-transitory computer-readable medium having computer-executable instructions stored thereon that, in response to execution by an electronic control unit (ECU), cause the ECU to perform actions for reducing vibration generated by an internal combustion engine during a cylinder deactivation mode, the actions comprising:
- transmitting, by the ECU, a command to initiate a cylinder deactivation mode;
- monitoring, by the ECU, engine state values of the engine;
- determining, by the ECU, an expected average torque based on a fuel demand;
- determining, by the ECU, a correction torque to compensate for a difference between the expected average torque and an instantaneous torque;
- and
- causing, by the ECU, an electric motor to apply the correction torque.
A method of reducing vibration generated by an internal combustion engine during a cylinder deactivation mode, the method comprising:
- transmitting, by an electronic control unit (ECU), a command to initiate a cylinder deactivation mode;
- monitoring, by the ECU, engine state values of the engine;
- determining, by the ECU, a correction torque to compensate for torque pulses generated by the engine during the cylinder deactivation mode;
- and
- causing, by the ECU, an electric motor to apply the correction torque.
Dependencies are inferred from the claim text.