Systems and methods for engine control based on engine oil viscosity
First Claim
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1. A method, comprising:
- determining an engine oil viscosity index of engine oil based on whether the engine oil viscosity index was updated at a last oil change, and if not, determining a lowest possible viscosity index for a current engine oil and assigning the lowest possible viscosity index as a current engine oil viscosity index;
determining an engine oil viscosity based on the engine oil viscosity index and an engine oil temperature during operation; and
setting an air intake throttle angle based on the engine oil viscosity.
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Abstract
A method, comprising: setting an engine intake airflow parameter based on an engine oil viscosity index. In this way, engine operating conditions that depend on engine friction and engine intake airflow, such as engine idling speed and engine friction torque, may be determined and implemented with an increased consistency. This in turn may decrease the possibility of engine stalls and improve engine performance, particularly at low temperatures.
9 Citations
15 Claims
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1. A method, comprising:
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determining an engine oil viscosity index of engine oil based on whether the engine oil viscosity index was updated at a last oil change, and if not, determining a lowest possible viscosity index for a current engine oil and assigning the lowest possible viscosity index as a current engine oil viscosity index; determining an engine oil viscosity based on the engine oil viscosity index and an engine oil temperature during operation; and setting an air intake throttle angle based on the engine oil viscosity. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An engine system comprising:
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at least one cylinder; at least one piston positioned in the at least one cylinder; an air intake passage coupled to the at least one cylinder; and a controller including instructions to; determine an engine oil viscosity index of engine oil responsive to a last engine oil viscosity index update and whether the last engine oil viscosity index update was updated since a last oil change; determine a viscosity of an engine oil in an engine oil system based on the determined viscosity index of the engine oil and a temperature of the engine oil; and adjust airflow through the air intake passage based on the viscosity of the engine oil via one or more of adjusting an angle of an air intake throttle disposed in the air intake passage, increasing intake valve lift or duration of an intake valve via a variable valve lift system, advancing intake valve opening timing via a variable valve timing system, and combinations thereof. - View Dependent Claims (8, 9, 10, 11)
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12. A method for an engine, comprising:
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determining a first engine oil viscosity based on a first engine oil temperature and a first engine oil viscosity index; determining a second engine oil viscosity index based on engine usage since a last engine oil viscosity index update and a second engine oil viscosity based on a second engine oil temperature and the determined second engine oil viscosity index; during a first condition; increasing engine intake airflow via increasing an angle of an air intake throttle responsive to the first engine oil viscosity and a desired engine idling speed; and during a second condition; decreasing engine intake airflow via decreasing the angle of the air intake throttle responsive to the second engine oil viscosity and a desired engine idling speed, the second engine oil viscosity lower than the first engine oil viscosity. - View Dependent Claims (13, 14, 15)
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Specification