Control method and control system for continuously variable valve lift mechanism and vehicle
A control method for a continuously variable valve lift mechanism includes: controlling a continuously variable valve lift mechanism to enter a limp mode when the continuously variable valve lift mechanism fails and disables an automatic valve lift changing function; driving and forcing the continuously variable valve lift mechanism to move to a maximum lift position; and triggering a self locking function to self lock the continuously variable valve lift mechanism at the maximum lift position when the continuously variable valve lift mechanism reaches the maximum lift position. A control system for a continuously variable valve lift mechanism, and a vehicle are also provided.
1. A vehicle, provided with a control system for a continuously variable valve lift mechanism comprising:
a driver configured to drive and force the continuously variable valve lift mechanism to move to a maximum lift position, and trigger a self locking function to self lock the continuously variable valve lift mechanism at the maximum lift position when the continuously variable valve lift mechanism reaches the maximum lift position, wherein the continuously variable valve lift mechanism is configured such that at the maximum lift position, a resultant force of a roller assembly thereof on an eccentric wheel has a direction passing through an axis of an eccentric shaft, so as to self lock the continuously variable valve lift mechanism at the maximum lift position when the continuously variable valve lift mechanism reaches the maximum lift position in a limp mode.
2. The vehicle according to claim 1 , wherein the control system comprises a processor configured to control an opening of a throttle valve to enable the vehicle to be started and travel after the continuously variable valve lift mechanism is self locked at the maximum lift position.
3. The vehicle according to claim 1 , wherein the continuously variable valve lift mechanism comprises:
a supporting base,
a camshaft mounted on the supporting base and rotatable relative to the supporting base, the camshaft being provided with a cam;
the eccentric shaft mounted on the supporting base and rotatable relative to the supporting base, the eccentric shaft being provided with the eccentric wheel;
an intermediate swing arm mounted on the supporting base and pivotable relative to the supporting base, the intermediate swing arm being provided with a roller;
the roller assembly in contact with the cam of the camshaft, the eccentric wheel of the eccentric shaft and the roller of the intermediate swing simultaneously; and
a valve in contact with the intermediate swing arm, wherein the camshaft drives the valve to open and close via the roller assembly and the intermediate swing arm, and the eccentric shaft drives the roller assembly to change a contact point between the roller assembly and the roller of the intermediate swing arm to regulate a lift and an opening duration of the valve.