A method for mounting a camshaft in a bearing line of a cylinder head cover of an internal combustion engine may involve mounting a sealing ring in a groove extending radially circumferentially on an outer diameter of the camshaft. The sealing ring may be at least partly formed of an elastically deformable polymer such as polytetrafluoroethylene (PTFE). The method may further involve sliding a calibrating tool having a rotationally symmetrical opening onto the camshaft or sliding the camshaft into the calibrating tool. A smallest inside diameter of the rotationally symmetrical opening may be greater than an outside diameter of the camshaft in a region of the groove but less than an outside diameter of the sealing ring. Consequently, the sealing ring is pressed into the groove and is frictionally and interlockingly held in the groove.

The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

A rocker arm includes an outer arm with an outer follower and an inner arm which selectively pivots relative to the outer arm, the inner arm having an inner follower. A lost motion spring biases the inner arm to pivot relative to the outer arm. A lock pin which slides between a coupled position and a decoupled position. A pivot shaft includes a first portion a second portion centered about a first pivot shaft axis and a third portion located between the first portion and the second portion that is centered about a second pivot shaft axis which is parallel to, and laterally offset from, the first pivot shaft axis. The third portion supports the inner arm.

The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

A method for setting lash on a switching rocker arm assembly includes providing a rocker arm having (i) an outer arm having a first outer side arm and a second outer side arm, the outer arm defining an opening, (ii) an inner arm disposed between the first and second outer side arms, (iii) a roller follower that selectively engages a cam, the roller follower mounted about a bearing axle that extends through the opening. A zero lash shim is inserted into a gap defined between the bearing axle and the outer arm at the opening. The rocker arm is installed into the valvetrain with the master tip cap. Lash is measured between the cam and the roller follower. The rocker arm and the master tip cap is removed. A select fit valve tip cap is installed based on the master tip cap and the measured lash.

The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

Methods and systems are provided for adjusting an oil pressure supplied to an engine and a variable cam timing (VCT) responsive to a condition of the VCT system. In one example, a method may include adjusting the oil pressure based on engine speed, engine load, and engine oil temperature, and responsive to a request to shift the VCT system during specific engine operating conditions, increasing the oil pressure to an upper threshold oil pressure for the duration of the shift.

Methods and systems are provided for adjusting an oil pressure supplied to an engine and a variable cam timing (VCT) responsive to a condition of the VCT system. In one example, a method may include adjusting the oil pressure based on engine speed, engine load, and engine oil temperature, and responsive to a request to shift the VCT system during specific engine operating conditions, increasing the oil pressure to an upper threshold oil pressure for the duration of the shift.

The present invention relates to a control device and to a control method for a vehicle drive mechanism including a moving body having a movability range regulated by two stoppers, and a sensor which senses a position of the moving body. The control device of the present invention learns an output of the sensor corresponding to a contact state of a high-rigidity stopper, and limits, to a lower level, an operation variable of the actuator for moving the moving body toward a low-rigidity stopper along with an increase in an amount of change in the output of the sensor from the contact state of the high-rigidity stopper. Then, the control device learns the output of the sensor corresponding to the contact state of the low-rigidity stopper, and controls the actuator based on the output of the sensor learned at both the stopper positions.

The present disclosure relates to internal combustion engines and the teachings thereof may be embodied in methods for controlling an internal combustion engine. The method may include: measuring the actual camshaft position using a camshaft sensor, measuring the actual rail pressure using a rail pressure sensor, calculating, for each of the plurality of cylinders, a phase correction value depending at least in part on the measured actual rail pressure and a mass of fuel to be injected, calculating, for each cylinder, a corrected actual camshaft position based at least in part on the measured actual camshaft position and the respective phase correction value, and adjusting the camshaft position using a camshaft adjuster based on one or more of the corrected actual camshaft positions.