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1. WO2020260518 - A CONTROLLER AND A METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS

1. A controller for controlling operation of an internal combustion engine, the controller being configured to:

during fuel cut, cause opening of an intake valve of a cylinder of the internal combustion engine to enable air having a mass to enter the cylinder; wherein

the mass is below a first range of masses which enable the internal combustion engine to provide combustion torque.

2. A controller according to claim 1 , wherein:

said controller comprises an electronic processor having an electrical input for receiving said first request signal; and an electronic memory device electrically coupled to the electronic processor and having instructions stored therein, the processor being configured to access the memory device and execute the instructions stored therein.

3. A controller according to claim 1 or claim 2, wherein the controller is configured to cause opening of the intake valve to enable a mass of air in the first range of masses to enter the cylinder during all intake strokes of the cylinder in which fuel is combusted during a next power stroke of the cylinder.

4. A controller according to any one of claims 1 to 3, wherein: during fuel cut, the controller is configured to cause opening of the intake valve during each intake stroke of the cylinder to enable a mass of air in a second range of masses to enter the cylinder during each intake stroke; and a largest mass in the second range of masses is smaller than a smallest mass in the first range of masses, and optionally wherein the largest mass in the second range of masses is at least 3 times smaller than the smallest mass in the first range of masses.

5. A controller according to any one of claims 1 to 4, wherein the controller is configured to:

receive a fuel cut request signal indicative of a request to stop fuel being supplied to the engine; and

cause opening of the intake valve to enable air having a mass below the first range of masses to enter the cylinder during a next intake stroke of the cylinder next following the receipt of the request signal, in dependence on the intake valve being closed at the time of receiving the request signal.

6. A controller according to any one of claims 1 to 5, wherein the controller, in dependence on a fuel cut request signal being received while the intake valve is open, or about to be opened having been scheduled, is configured to:

cause air having a mass in the first range of masses to enter the cylinder;

cause injection of fuel into the cylinder;

cause closing of the intake valve; and

subsequently cause opening of the intake valve to enable air having a mass below the first range of masses to enter the cylinder during the intake stroke of the cylinder next following said closing of the intake valve, and optionally

wherein the controller is configured to cause ignition of fuel in the cylinder following said closing of the intake valve, to enable combustion of the fuel in the cylinder during a next power stroke following the closing of the intake valve, and the controller is configured to cause said ignition only after a piston in the cylinder has reached top dead center.

7. A controller according to any one of claims 1 to 6, wherein the controller is configured to:

receive a start request signal indicative of a request to increase a rotational speed of an output of the internal combustion engine from zero; and

cause opening of an intake valve of at least one cylinder of the internal combustion engine to enable air having a mass below the first range of masses to enter during at least a first intake stroke of the at least one cylinder and preventing injection of fuel during the at least a first intake stroke; and optionally

wherein the controller is configured to cause only a mass of air below the first range of masses to enter each cylinder of the internal combustion engine until: an intake stroke of a cylinder of the internal combustion engine that is expected to have its next power stroke after the internal combustion engine has reached a required speed of rotation; or the internal combustion engine has been rotated through a predefined angle.

8. A control system for controlling operation of an internal combustion engine comprising a controller according to any one of claims 1 to 7 and a valve actuation means configured to cause opening of the intake valve of each cylinder of the internal combustion engine, wherein the valve actuation means is configured to control valve lift height and/or valve lift duration in dependence on a signal received from the controller;

wherein the valve actuation means optionally comprises a variable valve lift system; and .

wherein the variable valve lift system further optionally comprises a continuous variable valve lift system and/or a hydraulic system.

9. An internal combustion engine comprising the controller of any one of claims 1 to 7 or the control system of claim 8, wherein the engine comprises one or more exhaust valves mechanically actuated by cams fixed to a camshaft.

10. A vehicle comprising the controller according to any one of claims 1 to 7, the control system according to claim 8 or the internal combustion engine according to claim 9.

11. A method of controlling an internal combustion engine comprising:

during fuel cut, causing opening of an intake valve of a cylinder of the internal combustion engine to enable air having a first mass to enter the cylinder; wherein

the first mass is below a range of masses which enable the internal combustion engine to provide combustion torque.

12. A non-transitory computer readable medium comprising computer readable instructions that, when executed by a processor, cause performance of a method according to claim 11.