Approach for adaptive control of cam profile switching for combustion mode transitions
First Claim
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1. A method of controlling cylinder valve switching between a first valve condition and a second valve condition for transitioning between combustion modes of an engine, comprising:
- adjusting timing of a signal to switch between the first and second valve conditions based on an oil degradation condition from an oil sensor and further based on an oil temperature from the oil sensor, wherein the combustion modes include spark ignition and homogenous charge compression ignition.
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Abstract
A method is disclosed for controlling cylinder valve switching between a first valve condition and a second valve condition for transitioning between combustion modes of an engine. The method includes adjusting timing of a signal to switch between the valve conditions based on an oil degradation condition from an oil sensor, wherein the combustion modes include spark ignition and homogenous charge compression ignition.
34 Citations
19 Claims
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1. A method of controlling cylinder valve switching between a first valve condition and a second valve condition for transitioning between combustion modes of an engine, comprising:
adjusting timing of a signal to switch between the first and second valve conditions based on an oil degradation condition from an oil sensor and further based on an oil temperature from the oil sensor, wherein the combustion modes include spark ignition and homogenous charge compression ignition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for operating an engine of a vehicle, the engine having at least a first cylinder, the system comprising:
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a camshaft having at least a first lift profile and a second lift profile, the first lift profile differing from the second lift profile; a valve of the cylinder actuated via the camshaft, the valve having an actuating tappet configured to switch between a first lift state where valve lift is based on at least the first profile and a second lift state where valve lift is based on at least the second profile; an oil sensor to measure engine oil degradation; a controller configured to send a signal to actuate the tappet to switch between the first lift state and the second lift state based on a request to transition between spark ignition and homogenous charge compression ignition combustion modes, where a timing of sending the signal is adjusted in response to information from the oil sensor. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method to control valve switching for transitioning between combustion modes of an engine, the engine having a plurality of cylinders, each with at least a first valve profile and a second valve profile, where the first and second valve profiles are changed by switching tappets controlled by an oil circuit, comprising:
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sending a signal to the oil circuit to switch the tappets to transition combustion modes; receiving oil temperature and oil degradation information from an oil sensor; and adjusting a timing of sending the signal based on the oil temperature and oil degradation information. - View Dependent Claims (17, 18, 19)
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Specification