# US 9,436,916 B2 · Method for determining a correction characteristic curve

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- Number: US 9,436,916 B2
- Document ID: US9436916B2
- Status: Granted
- Kind: B2
- Application number: 13/808,060
- Filed: 2011-06-27
- Published: 2013-06-27
- Granted: 2016-09-06
- Earliest claimed: 2010-07-02
- Assignees: Robert Bosch GmbH
- Applicants: Guenter Veit
- Inventors: Guenter Veit
- Web page: https://patentgrep.com/patent/US9436916B2

## CPC

- G06N 20/00: Machine learning
- F02D 41/1402: {Adaptive control}
- F02D 41/2422: {Selective use of one or more tables}
- F02D 41/2464: {Characteristics of actuators}
- F02D 41/2477: {characterised by the method used for learning}
- F02D 41/3845: {by controlling the flow into the common rail, e.g. the amount of fuel pumped}
- F02D 41/3854: {with elements in the low pressure part, e.g. low pressure pump}
- G05B 13/0265: {the criterion being a learning criterion}
- F02D 41/2467: {for injectors}
- F02D 41/3082: {Control of electrical fuel pumps}
- F02D 2041/1409: {using at least a proportional, integral or derivative controller}
- F02D 2041/141: {using a feed-forward control element}
- F02D 2200/0602: Fuel pressure
- F02D 2200/0604: Estimation of fuel pressure
- F02D 2250/04: Fuel pressure pulsation in common rails
- F02D 2250/31: Control of the fuel pressure
- F02M 63/0225: {Fuel-injection apparatus having a common rail feeding several injectors (F02M63/0003 takes precedence); Means for varying pressure in common rails; Pumps feeding common rails}
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A method for determining a correction characteristic curve for adapting a characteristic curve of an injection system, in which the correction characteristic curve includes at least one deviation of a measured characteristic curve from a setpoint characteristic curve, the at least one deviation including a sum tolerance of at least two components of the injection system, which have an effect on the characteristic curve.

## Claims

### Claim 1

A method for determining a correction characteristic curve for adapting a characteristic curve of an injection system, the method comprising:
ascertaining at least one deviation using a learning function, wherein the correction characteristic curve includes the at least one deviation, which is of a measured characteristic curve from a setpoint characteristic curve;
wherein the at least one deviation includes a sum tolerance of at least two components of the injection system which have an effect on the characteristic curve.

### Claim 2 (depends on 1)

The method of claim 1, wherein a sum tolerance of all components of the injection system is taken into account.

### Claim 3 (depends on 2)

The method of claim 2, wherein the at least one deviation is stored and the correction characteristic curve is ascertained therefrom, and wherein the learning function is adapted using the ascertained correction characteristic curve.

### Claim 4 (depends on 1)

The method of claim 1, wherein as the characteristic curve, a pump characteristic curve of a pump of the injection system is adapted.

### Claim 5 (depends on 1)

The method of claim 1, wherein as the characteristic curve, a pilot control engine characteristic map of the injection system is adapted.

### Claim 6 (depends on 1)

The method of claim 1, wherein the method is performed in a certain operating condition of the injection system, the certain operating condition being characterized by at least one operating parameter, and wherein only the portion of the deviation which correlates with the at least one operating parameter is taken into account for the correction characteristic curve.

### Claim 7 (depends on 1)

The method of claim 1, wherein at least two, but not all, of a fuel pump, a fuel control unit, a high-pressure pump, a fuel accumulator, and lines are taken into account as components of the injection system for the sum tolerance.

### Claim 8

A system for determining a correction characteristic curve for adapting a characteristic curve of an injection system, comprising:
a control unit including at least one first module which determines a correction characteristic curve, including at least one deviation of a measured characteristic curve from a setpoint characteristic curve, the at least one first module having the at least one deviation taking into account a sum tolerance of at least two components of the injection system which have an effect on the characteristic curve, the at least one deviation being ascertained using a learning function.

### Claim 9 (depends on 8)

The system of claim 8, the control unit further comprising:
at least one second module configured to check a function of at least one component of the injection system, taking into account the correction characteristic curve.