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Method and apparatus for controlling a variable valve train of an internal combustion engine

A valve train, internal combustion engine technology, applied in the direction of internal combustion piston engine, electrical control, combustion engine, etc., can solve the problems of limiting driving comfort, unstable driving, and reducing driving comfort.

Active Publication Date: 2017-02-15
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, manufacturing-induced tolerances in the valve train and the valves produce deviations in the filling of the cylinders
Especially in the low load range and idling speed (intake valve lift or opening time is very small in unthrottled operation), compared with the perceivable torque difference, the deviation in cylinder filling is clearly already small, and this limited driving comfort
Torque differences can arise not only between different internal combustion engines, but also between cylinders of the same internal combustion engine, which in the worst case lead to a perceived rough ride in the low load range or at idle speed and thus to Reduced ride comfort

Method used

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  • Method and apparatus for controlling a variable valve train of an internal combustion engine
  • Method and apparatus for controlling a variable valve train of an internal combustion engine
  • Method and apparatus for controlling a variable valve train of an internal combustion engine

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Embodiment Construction

[0029] figure 1 Internal combustion engine 1 is shown schematically.

[0030] The internal combustion engine 1 includes four cylinders 2 , of which only one cylinder is therefore shown for reasons of clarity. The description for this cylinder also applies analogously to the other cylinders. Arranged within the cylinder 2 is a piston 3 which can reciprocate within the cylinder 2 . The internal combustion engine 1 also includes an intake branch 40 , in which an intake port 4 for intake of fresh air, an air mass sensor 5 , a throttle valve 6 and an intake line 7 are arranged downstream. The intake branch 40 opens into the combustion chamber 30 delimited by the cylinder 2 and the piston 3 . The fresh air required for combustion is fed into the combustion chamber 30 via an intake branch 40 , wherein the fresh air supply is controlled by opening and closing at least one intake valve 8 .

[0031]The internal combustion engine 1 shown here is an internal combustion engine 1 with d...

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Abstract

An improved method for controlling a variable valve train (80, 110) of an internal combustion engine (1) having a plurality of cylinders (2) is disclosed, wherein each Each cylinder (2) reduces the amount of fuel supplied to each cylinder until it reaches a predetermined limit value of rough driving. The variable valve train ( 80 , 110 ) is controlled taking into account a cylinder-specific fuel quantity reduction value in a first operating point.

Description

technical field [0001] The invention relates to a method and a device for controlling a variable valve train of an internal combustion engine having a plurality of cylinders. Background technique [0002] In an effort to further reduce the fuel consumption and pollutant emissions of modern internal combustion engines, internal combustion engines with variable valve trains for variably controlling the intake and / or exhaust valves are increasingly being used. In this case, internal combustion engines with variable valve lift control and / or variable control of the valve opening times have proven to be particularly effective, since they can be operated virtually without throttle in the low and medium load range ( fully open the throttle valve) for operation. Among them, the load control is realized only by the lift or opening time of the intake valve. In this unthrottled operating range, there are fewer gas exchange losses, which lead to reduced consumption. However, producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/00F02D13/02
CPCF02B23/101F02D13/0207F02D41/0002F02D41/0085F02D41/1498F02D41/221Y02T10/12F02D13/02F02D41/00
Inventor G·埃泽尔T·盖斯S·格斯纳S·梅萨奇
Owner VTESCO TECH GMBH
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