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Method of optimising idling of an internal combustion engine

A technology of internal combustion engine and engine speed, applied in the direction of engine components, engine control, machine/engine, etc., to achieve the effect of reducing exhaust emissions and avoiding incomplete combustion

Inactive Publication Date: 2016-06-15
JAGUAR LAND ROVER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing methods of varying valve operation are too slow, although varying valve timing or opening duration, or overlap time or lift can help address this problem

Method used

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  • Method of optimising idling of an internal combustion engine
  • Method of optimising idling of an internal combustion engine
  • Method of optimising idling of an internal combustion engine

Examples

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Embodiment Construction

[0035]Referring to the drawings, an internal combustion engine 10 has a cylinder 11 in which a piston 12 reciprocates. A combustion chamber 13 is defined above the piston and houses a poppet valve 14 which opens to admit air from an intake port 15 . The intake port is fed from an intake manifold 16 at the mouth of which a throttle valve 17 is provided.

[0036] The poppet valve 14 is closed by a spring (not shown) and opened by the action of a rotatable cam 18, typically provided by a lobe of a camshaft (not shown). A push rod 19 is arranged between the cam 18 and the valve 14 .

[0037] figure 1 The general arrangement of is very common, and some other components, such as the corresponding poppet exhaust valve, are not shown for ease of illustration. Typically, prior art pushrods 19 are solid, and the pushrod 19 may be passive in character.

[0038] However, figure 1 The pushrod is active and in this embodiment is characterized by a hydraulic chamber 20 whose capacity is...

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PUM

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Abstract

A method of controlling idle speed of a reciprocating piston gasoline engine having inlet poppet valves and active tappets therefor. The method allows the volume of inlet air to be varied so that idle speed can be confined within upper and lower limits with efficient combustion. The active tappets may be electro-hydraulic.

Description

technical field [0001] The present invention relates to a method of optimizing idling of an internal combustion engine, a control system for providing optimized idling, and an engine so controlled. Background technique [0002] Conventional reciprocating piston internal combustion engines have poppet valves to control the flow of air into the cylinders and the flow of combustion gases to the exhaust system. The opening and closing timing of these valves must be carefully timed to ensure efficient combustion over the four stroke cycle, and typically the camshaft controls the opening and closing of the valves according to camshaft rotational position. [0003] It has long been recognized that some variation in valve operation can be beneficial in ensuring optimum engine performance, particularly varying valve timing and / or varying valve lift and / or varying the duration of valve opening. The intake and exhaust valves require independent control, so separate intake and exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/08F02D31/00F01L9/02F02D41/00F01L9/14
CPCF02D31/003F02D2041/001F01L2800/04F01L2800/08F02D41/083F01L9/14F01L1/14F01L1/245F01L1/25F02D13/00F02D13/02F02D13/0203F02D13/0223F01L1/22F01L2201/00F02D13/0226F02D41/08F02D41/26
Inventor 尼克·布罗克利
Owner JAGUAR LAND ROVER LTD