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US 6,728,626 B2Granted
Internal combustion engine with means for uniforming the amount of intake air in different cylinders, and method therefor
AssigneeC.R.F. Societa Consortile per Azioni
InventorsMassimiliano Maira, Francesco Richard
Life of this patent
Estimating the term…
Abstract
In a multi-cylinder internal combustion engine, equipped with an electronically controlled hydraulic system for the variable operation of the engine's inlet valves, an indicator of the differences in the amount of air aspirated by the cylinders of the engine during the respective induction phase is provided and said system controls the various inlet valves of the engine in a differentiated manner, varying the time and/or opening travel for the purpose of minimizing the differences between the amounts of air aspirated by the various cylinders of the engine.
Claims13
A multi-cylinder combustion engine, comprising:
- at least one inlet valve for each cylinder, equipped with respective elastic means of return that push the valve towards a closed position, for controlling the respective inlet port,
- at least one camshaft for operating each inlet valve of the cylinders of the engine via the respective valve lifters, each inlet valve being controlled by a respective cam of said camshaft,
- in which each of said valve lifters commands the respective inlet valve against the action of said elastic means of return via the interposition of hydraulic means including a pressurized fluid chamber,
- the pressurized fluid chamber associated with each inlet valve being suitable for connection via a solenoid valve to an discharge channel for the purpose of decoupling the valve from its respective valve lifter and provoking rapid closure of the valve under the effect of the elastic means of return, and
- electronic means of control for controlling each solenoid valve to vary the time and opening travel of the respective inlet valve in function of one or more of the engine's operating parameters,
- wherein the inlet ports controlled by said inlet valves communicate with a single inlet duct in which sensors for detecting the air flow through said inlet duct are situated, and detecting means for detecting the difference in air aspirated by the cylinders of the engine during the respective induction phase and the electronic means of control controlling the time and opening travel of the various cylinders in a differentiated manner for the purpose of minimizing the dispersion detected in the air aspirated by the various cylinder.
3 more elements
A procedure for the control of a multi-cylinder combustion engine comprising,
- at least one inlet valve for each cylinder, equipped with respective elastic means of return that push the valve towards a closed position, for controlling the respective inlet port,
- at least one camshaft for operating each inlet valve of the cylinders of the engine via the respective valve lifters, each inlet valve being controlled by a respective cam of said camshaft,
- in which each of said valve lifters commands the respective inlet valve against the action of said elastic means of return via the interposition of hydraulic means including a pressurized fluid chamber,
- the pressurized fluid chamber associated with each inlet valve being suitable for connection via a solenoid valve to an discharge channel for the purpose of decoupling the valve from its respective valve lifter and provoking rapid closure of the valve tinder the effect of the elastic means of return, and
- electronic means of control for controlling each solenoid valve to vary the time and opening travel of the respective inlet valve in function of one or more of the engine's operating parameters,
- wherein the inlet ports controlled by said inlet valves communicate with a single inlet duct in which sensors for detecting the air flow through said inlet duct are situated, detecting means for detecting the difference in air aspirated by the cylinders of the engine during the respective induction phase and the electronic means of control control the time and opening travel of the various cylinders in a differentiated manner for the purpose of minimizing the dispersion detected in the air aspirated by the various cylinder,
- wherein the difference in air aspirated by the cylinders of the engine during the respective induction phase is detected, and the time and opening travel of the inlet valves of the various cylinders is controlled in a differentiated manner for the purpose of minimizing the dispersion detected in the air aspirated by the various cylinders.
4 more elements
Dependencies are inferred from the claim text.