US5709192A
Expired / Lapsed
US
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Method for determining the differences between non-uniform cylinder torque moments in an internal combustion engine and application of the method
Assignee: Rolls Royce Solutions GmbH
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Filing: 1996-09-13
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Granted: 1998-01-20
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Expires: 2016-09-13
Abstract
Abstract Relative differences between cylinder torque moments are individually determined for each cylinder in a multicylinder internal combustion engine in which individual cylinders may be switched off. The torque moment differences are ascertained indirectly when the engine is subject to inner and outer resistance moments and to the inertia moments of all masses to be accelerated. Under these conditions the crankshaft r.p.m. is measured and the r.p.m. signal is split into components for the individual cylinders by applying the superposition principle of linear systems. The first r.p.m. is determined when all cylinders work. The second r.p.m. is determined with all cylinders but one working and the second r.p.m. is deducted from the first r.p.m. Gradually one cylinder after the other is switched off and the respective differences in the r.p.m. are ascertained. These r.p.m. differences are allocated to the ignition compression and are compared with a difference r.p.m. of a reference cylinder. This comparing provides a torque difference for each cylinder relative to the reference cylinder. The results are then treated statistically, for example by the least square method to determine numerical values which are converted into closed loop control signals for controlling injection fuel quantities for each cylinder so that each cylinder will contribute the same moment component to the total torque moment of the engine.
Inventors
- 👤 Uwe Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:43
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46; F; F02; F02D; F02D41/00; F02D41/008; F02D41/0087; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; G01M; G01M15/00; G01M15/04; G01M15/042; G01M15/046; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A method for determining relative differences in nonuniform cylinder torques of an internal combustion engine having a plurality of cylinders and operating with an engine r.p.m. under the load of inner and outer resistance moments and inertia moments of masses to be accelerated comprising the following steps: (a) randomly selecting any one of said plurality of cylinders as a reference cylinder, (b) analyzing said engine r.p.m. to determine individual cylinder torques for each cylinder including said reference cylinder, and (c) forming a difference between a reference torque moment of said reference cylinder and torque moments of each remaining cylinder of said plurality of cylinders for determining said relative differences in said non-uniform cylinder torques.
Claim 2
Independent Claim
114 words
A method for determining relative differences in nonuniform cylinder torques of an internal combustion engine having a plurality of cylinders and operating with an engine r.p.m. under the load of inner and outer resistance moments and inertia moments of masses to be accelerated comprising the following steps: (a) randomly selecting any one of said plurality of cylinders as a reference cylinder, (b) analyzing said engine r.p.m. to determine individual cylinder torques for each cylinder including said reference cylinder, and (c) forming a difference between a reference torque moment of said reference cylinder and torque moments of each remaining cylinder of said plurality of cylinders for determining said relative differences in said non-uniform cylinder torques.
Claim 3
Dependent Claim
77 words
The method of claim 1, further comprising converting said relative cylinder torque differences into respective control signals, and supplying said control signals in closed loop fashion as an additional input control value to a respective fuel control device, whereby, depending on the differences between the individual cylinder and the reference cylinder, the fuel injection quantities are equalized for all cylinders so that each cylinder will contribute the same moment component to the total torque of the engine.
Claim 4
Dependent Claim
93 words
The method of claim 1, wherein said analyzing step comprises: (a1) measuring an engine r.p.m. signal when all cylinders of the engine are working and splitting said r.p.m. signal over at least one engine work cycle into specific cylinder r.p.m. components individually for each cylinder, thereby achieving a separate consideration of each ignition compression r.p.m. n ZZyl of each individual engine cylinder, and then (b 1 ) comparing the ignition compression r.p.m. of said randomly selected reference cylinder with each ignition compression r.p.m. of each other engine cylinder to form respective difference values.
Claim 5
Dependent Claim
164 words
The method of claim 3, wherein said step (a) is performed by executing the following substeps: (c 1 ) ascertaining the r p.m. characteristic n KS 0 of the engine with all cylinders operating, whereby the engine is controlled in closed loop fashion to operate at a defined working point (0) at which the crank r.p.m. is maintained constant and all cylinders receive the same injected fuel quantity; (d) switching off one engine cylinder (Zyl) for at least one work cycle and again ascertaining an r.p.m. n KS Zyl while all other engine cylinders are operating with the same fuel quantity as in said working point (0); (e) repeating the r.p.m. measurement of step (d) for all cylinders of the engine; and (f) determining the ignition compression r.p.m. n KS .sbsb.ZZyl for the individual engine cylinders as a difference of the r.p.m. (n KS Zyl , n KS 0 ) ascertained in steps (c), (d) and (e), thereby applying the equation n.sub.KS.sbsb.ZZyl =n.sub.KS.sup.0 -n.sub.KS.sup.Zyl.
Claim 6
Dependent Claim
56 words
The method of claim 3, further comprising a step (g) performed simultaneously with said steps (c 1 ), (d), and (e), said step (g) comprising equalizing in closed loop fashion relative to the ignition top dead center (TDC) the beginning of the fuel injection and the compression characteristic of all cylinders operated at the same time.
Claim 7
Dependent Claim
124 words
The method of claim 4, further comprising the following steps: (h) transcribing said ignition compression r.p.m. (n ZZyl ) into a vector x Zyl , determined in step (f) for each cylinder (Zyl) free of a mean value, over the crankshaft angle (φ) relative to the ignition (TDC) of the cylinder (Zyl) beginning with the angle (0), (i) further transcribing into a vector (x BZ ) the ignition compression r.p.m. of the reference cylinder (BZ) free of a mean value over the crankshaft angle (φ) relative to the ignition (OT) of the reference cylinder (BZ) beginning with (0); and (j) calculating the differences of the ignition compression r.p.m. components by determining a transfer factor (K Zyl ) according to the equation x.sub.Zyl =K.sub.Zyl *x.sub.BZ.
Claim 8
Dependent Claim
29 words
The method of claim 6, further comprising a step: (k1) including calculating in step (j) the transfer factor ( K Zyl ) by applying the least square method. ##EQU19##
Claim 9
Dependent Claim
41 words
The method of claim 6, further comprising: a step (k2) including calculating in step (j) the transfer factor (K Zyl ) according to the equation: ##EQU20## wherein N corresponds to the number of data for which an estimate is being made.
Claim 10
Independent Claim
134 words
A method for the individual determination of relative differences in nonuniform cylinder moments of an internal combustion engine, which is loaded by inner and outer resistance torques and by the inertia moment of all masses to be accelerated, and wherein each individual cylinder may be switched off, comprising the following steps: (a) ascertaining an overall r.p.m. signal when all cylinders of the engine are operating, (b) sequentially switching off one cylinder and again ascertaining respective specific cylinder r.p.m. signals individually for each cylinder, (c) determining relative torque differences of individual cylinders relative to a randomly selected reference cylinder by analyzing said r.p.m. signals of the engine to provide relative ratio values representing cylinder moment differences; and generating engine control signals individually for each cylinder of the engine in response to said relative ratio values.
Claim 11
Independent Claim
134 words
A method for the individual determination of relative differences in nonuniform cylinder moments of an internal combustion engine, which is loaded by inner and outer resistance torques and by the inertia moment of all masses to be accelerated, and wherein each individual cylinder may be switched off, comprising the following steps: (a) ascertaining an overall r.p.m. signal when all cylinders of the engine are operating, (b) sequentially switching off one cylinder and again ascertaining respective specific cylinder r.p.m. signals individually for each cylinder, (c) determining relative torque differences of individual cylinders relative to a randomly selected reference cylinder by analyzing said r.p.m. signals of the engine to provide relative ratio values representing cylinder moment differences; and generating engine control signals individually for each cylinder of the engine in response to said relative ratio values.
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