Control method for CVVL engine
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorsIn Sang Ryu, Jong Bum Park
Life of this patent
Estimating the term…
Abstract
A continuous variable valve lift engine may include determining whether an engine is in an idle state and an oil temperature of an engine is within a predetermined range, controlling, the engine in a predetermined control state when the engine is in the idle state and the oil temperature is within the predetermined range, and measuring, an error occurrence time when an error occurs in controlling the engine in the control state, and controlling the engine while switching the engine to a predetermined passive state when the error occurrence time is more than a preset time.
Claims14
A control method for a continuous variable valve lift (CVVL) engine, comprising:
- determining, by a control unit of a vehicle, whether the engine is in an idle state and an oil temperature of the engine is within a predetermined range;
- controlling, by the control unit, the engine in a predetermined control state when the engine is in the idle state and the oil temperature is within the predetermined range;
- and
- measuring, by the control unit, an error occurrence time when an error occurs in controlling the engine in the predetermined control state, and controlling the engine while switching the engine to a predetermined passive state when the error occurrence time is more than a preset time,
- wherein in the predetermined control state, an intake cam of the CVVL engine is in a maximum advancing state, an engine speed is a set basic idle RPM, and a valve lift is in a predetermined high lift state, and
- wherein in the predetermined passive state, the intake cam is in a parking state, the engine speed is larger than the basic idle RPM, and the valve lift is in a predetermined low lift state.
A control system of controlling a continuous variable valve lift (CVVL) engine, comprising:
- a variable sensor detecting a valve lift value;
- an oil temperature sensor detecting an oil temperature;
- a sensor measuring a required torque and rotational speed;
- a position sensor detecting intake/exhaust cam position;
- a throttle position sensor detecting an opening level of a throttle valve;
- a fuel injection sensor measuring a fuel injection amount;
- a sensor measuring an ignition timing;
- a cam sensor detecting a cam timing;
- and
- a control unit that receives information including the valve lift value, the oil temperature, the required torque and rotational speed, the intake/exhaust cam position, the throttle opening level, the fuel injection amount, the ignition timing, and the cam timing,
- wherein the control unit determines whether the engine is in an idle state and an oil temperature of the engine is within a predetermined range;
- wherein the control unit controls the engine in a predetermined control state when the engine is in the idle state and the oil temperature is within the predetermined range;
- and
- wherein the control unit measures an error occurrence time when an error occurs in controlling the engine in the predetermined control state, and controlling the engine while switching the engine to a predetermined passive state when the error occurrence time is more than a preset time,
- wherein in the predetermined control state, an intake cam of the CVVL engine is in a maximum advancing state, an engine speed is a set basic idle RPM, and a valve lift is in a predetermined high lift state, and
- wherein in the predetermined passive state, the intake cam is in a parking state, the engine speed is larger than the basic idle RPM, and the valve lift is in a predetermined low lift state.
Dependencies are inferred from the claim text.