Method for detecting and describing a transient driving situation

Patent metadata

Field	Value
Publication number	US-9869256-B2
Application number	US-201514830384-A
Country	US
Kind code	B2
Filing date	Aug 19, 2015
Priority date	Sep 11, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A method for detecting and describing a transient driving situation of a motor vehicle having an internal combustion engine having a boost pressure control system or intake manifold pressure control system, wherein an indicator for identifying the transient driving situation is determined from a relative boost pressure/intake manifold pressure control deviation.

First claim

What is claimed is:

1. A method for detecting and describing a transient driving situation of a motor vehicle having an internal combustion engine having a boost pressure control system or intake manifold pressure control system, the method comprising:
measuring a boost pressure/intake manifold pressure using a sensor;
determining a relative boost pressure/intake manifold pressure control deviation using the measured boost pressure/intake manifold pressure;
determining a dynamic indicator for identifying the transient driving situation from the relative boost pressure/intake manifold pressure control deviation;
checking if the dynamic indicator has a negative gradient;
filtering the dynamic indicator if the dynamic indicator has a negative gradient; and
controlling at least one of an EGR system, a boost pressure/injection system controller, an electrical auxiliary compressor, and an electric motor, using the dynamic indicator.

2. The method of claim 1 , wherein a deviation of a target value from an actual value of the boost pressure/intake manifold pressure control system is used as the relative boost pressure/intake manifold pressure control deviation.

3. The method of claim 1 , wherein the dynamic indicator is determined from the relative boost pressure/intake manifold pressure control deviation and from a variable characterizing the engine speed.

4. The method of claim 3 , wherein the dynamic indicator is a dimensionless variable.

5. The method of claim 3 , wherein the filtering includes smoothing off over time a trailing edge in the time course of the dynamic indicator using a low pass filter.

6. The method of claim 5 , wherein the low pass filtering is used in a predefinable range of injection volumes.

7. The method of claim 5 , wherein the low pass filter is a PT1 filter having a present value of the dynamic indicator as an initial value and a volume-dependent or volume gradient-dependent time constant.

8. A method for detecting and describing a transient driving situation of a vehicle with exclusively pilot-controlled boost pressure, the method comprising:
measuring a boost pressure using a sensor;
comparing the measured boost pressure and a reference boost pressure to provide a comparison result; and
determining a dynamic indicator for identifying the transient driving situation from the comparison result between the present boost pressure and the reference boost pressure;
checking if the dynamic indicator has a negative gradient;
filtering the dynamic indicator if the dynamic indicator has a negative gradient and;
controlling a boost pressure controller using the dynamic indicator.

9. The method of claim 8 , wherein environmental corrections are taken into account in the reference boost pressure.

10. The method of claim 1 , wherein a quantitative identification of a transient driving situation is carried out based on the value of the dynamic indicator and its behavior over time.

11. A non-transitory computer readable medium having a computer program, which is executable by a processor, comprising:
a program code arrangement having program code for detecting and describing a transient driving situation of a motor vehicle having an internal combustion engine having a boost pressure control system or intake manifold pressure control system, by performing the following:
measuring a boost pressure/intake manifold pressure using a sensor;
determining a relative boost pressure/intake manifold pressure control deviation using the measured boost pressure/intake manifold pressure; and
determining a dynamic indicator for identifying the transient driving situation from the relative boost pressure/intake manifold pressure control deviation;
checking if the dynamic indicator has a negative gradient;
filtering the dynamic indicator if the dynamic indicator has a negative gradient; and
controlling at least one of an EGR system, a boost pressure/injection system controller, an electrical auxiliary compressor, and an electric motor, using the dynamic indicator.

12. The non-transitory computer readable medium of claim 11 , wherein a deviation of a target value from an actual value of the boost pressure/intake manifold pressure control system is used as a relative boost pressure/intake manifold pressure control deviation.

13. An electronic control unit, comprising:
a control arrangement to detect and describe a transient driving situation of a motor vehicle having an internal combustion engine having a boost pressure control system or intake manifold pressure control system, by performing the following:
measuring a boost pressure/intake manifold pressure using a sensor;
determining a relative boost pressure/intake manifold pressure control deviation using the measured boost pressure/intake manifold pressure;
determining an indicator for identifying the transient driving situation from the relative boost pressure/intake manifold pressure control deviation;
checking if the dynamic indicator has a negative gradient;
filtering the dynamic indicator if the dynamic indicator has a negative gradient; and
controlling at least one of an EGR system, a boost pressure/injection system controller, an electrical auxiliary compressor, and an electric motor, using the dynamic indicator.

14. The method of claim 1 , wherein the dynamic indicator is determined from the relative boost pressure/intake manifold pressure control deviation and from a variable characterizing the engine speed, in particular by a two-dimensional characteristics diagram interpolation from a characteristics diagram encompassing the boost pressure/intake manifold pressure deviation and engine speed.

15. The method of claim 3 , wherein the dynamic indicator is a dimensionless variable, in particular in the value range between 0 and 1.

16. The method as recited in claim 1 , wherein the controlling includes controlling the electrical auxiliary compressor to build up boost pressure.

17. The method as recited in claim 1 , wherein the controlling includes triggering the electric motor to build up torque.

18. The method as recited in claim 1 , wherein the filtering is not performed when the dynamic indicator does not have a negative gradient.

Assignees

• Bosch Gmbh Robert

Inventors

• Lachenmaier Sebastian
• Zeller Johannes
• Bachner Michael

Classifications

• F02D21/08 Primary

  the other gas being the exhaust gas of engine · CPC title

• F02D41/1401

  characterised by the control or regulation method (F02D41/1473, F02D41/1477 take precedence) · CPC title

• F02D41/045

  Detection of accelerating or decelerating state (detection thereof in general G01P) · CPC title

• Y02T10/144

  Cross-Sectional Technologies · mapped topic

• F02D2041/1432

  the system including a filter, e.g. a low pass or high pass filter · CPC title