Abstract:
A method of providing a rocker arm set for a valvetrain includes providing a first intake rocker arm, a second intake rocker arm and a first exhaust rocker arm. The first intake rocker arm is configured as a switching rocker arm for a first intake valve on a first cylinder. The second intake rocker arm is for a second intake valve on a second cylinder. The second rocker arm is configured to operate in a normal Otto cycle mode. The first exhaust rocker arm is provided for a first exhaust valve on the second cylinder. The first intake rocker arm operates in one of an LIVC or EIVC mode where the first intake rocker arm is configured to open or close at a different time compared to the second intake valve. The first exhaust rocker arm operates in a cylinder deactivation mode.
Abstract:
A hybrid vehicle includes an internal combustion engine, an electrical storage device, an electric motor, an exhaust emission control device, and a controller. The internal combustion engine includes a variable valve actuating device. The variable valve actuating device is configured to change an operation characteristic of an intake valve. The electrical storage device is configured to store electric power. The electric power is generated by using the internal combustion engine. The electric motor is configured to generate a driving force of the hybrid vehicle by using the electric power stored in the electrical storage device. The exhaust emission control device is configured to purify exhaust gas from the internal combustion engine with the use of a catalyst. The controller is configured to execute catalyst warm-up control. The catalyst warm-up control is control for warming up the catalyst of the exhaust emission control device. The catalyst warm-up control includes first control and second control. The first control is control for operating the internal combustion engine at a first operating point. The second control is control for, after the first control is executed, operating the internal combustion engine at a second operating point irrespective of a driving force that is required to propel the hybrid vehicle. An output of the internal combustion engine at the second operating point is larger than an output of the internal combustion engine at the first operating point. The controller is configured to operate the internal combustion engine such that an ignition timing of the internal combustion engine at the time when the first control is executed is controlled to a retarded side with respect to an ignition timing of the internal combustion engine at the time when the second control is executed. The controller is configured to control the variable valve actuating device such that, when the second control is executed, at least one of a valve lift of the intake valve or a valve operating angle of the intake valve increases as charging of the electrical storage device is more limited.
Abstract:
An oil control valve system according to one example of the present disclosure incorporates a common or interchangeable oil control valve at distinct locations of an engine to direct operation of switching mechanisms over sets of three cylinders. In another aspect of the present disclosure, four interchangeable oil control valves are used in a six-cylinder engine. Utilizing interchangeable oil control valves minimizes design costs, reduces assembly time, lessens repair or replacement burdens, and allows for enhanced engine performance.
Abstract:
In a motor vehicle provided with an internal combustion engine having a system for variable actuation of the intake valves there is provided for a phase of activation of an operating mode with the engine off and the vehicle moving, in which the fuel supply to the engine is cut-off. After the cut-off of the fuel supply to the engine, the system for variable actuation of the intake valves is controlled to vary the opening time and/or closing time and/or the lift of the intake valves so as to control the losses due to the pumping effect which occur within the engine in cut-off condition. If the engine is equipped with a starter capable of starting while engine moving, pumping losses are minimised to increase engine run down time. If the engine is equipped with a starter capable of starting only engine at still stand, pumping losses are minimised as long as rpm is above threshold to allow restart by fuel supply and pumping losses are maximised when rpm is below threshold to reach quick stand still for restart by electric starter. This insures quick restart in case of driver change of mind in any case.
Abstract:
In a vehicle provided with a power propulsion system of the mild-hybrid type, a BAS unit (EM) - constituted by an electric machine connected through a belt transmission to the shaft of an internal combustion engine - is exploited as the only propulsion engine of the vehicle in given operating conditions. The internal combustion engine is provided with a system for variable actuation of the intake valves which is controlled to reduce the pumping losses of the internal combustion engine in the phase in which such engine (ICE) is in cut-off condition and it is driven by the aforementioned BAS unit (EM). It is also provided for that the system for variable actuation of the intake valves be controlled to temporarily increase the pumping losses of the internal combustion engine in a phase in which it is required to accelerate the switching off of the engine.