Method and arrangement for controlling an operating variable of a motor vehicle

• US 6,205,976 B1
• Filed: 02/28/2000
• Issued: 03/27/2001
• Est. Priority Date: 09/12/1997
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schmidt, Henning, Loehr, Diethard
• Primary Examiner(s): Yuen, Henry C.
• Assistant Examiner(s): GIMIE, MAHMOUD
• Application Number:
  US09/514,317
• Time in Patent Office: 393 Days
• Field of Search: 123/350, 123/361, 123/357, 123/399, 123/396, 123/339.19, 123/339.2, 123/339.21, 123/352, 123/353, 123/354, 123/355, 123/358, 123/356, 123/696, 701/109, 701/106
• US Class Current: 123/350
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2041/1409 using at least a proportional, integral or derivative controller
• CPC Class Codes: F02D 2041/1422 Variable gain or coefficients
• CPC Class Codes: F02D 31/005 by controlling a throttle by-pass
• CPC Class Codes: F02D 35/0007 using electrical feedback F02D35/0015 takes precedence
• CPC Class Codes: F02D 41/042 for stopping the engine
• CPC Class Codes: F02D 41/16 for idling

Abstract

The invention is directed to a method and an arrangement for controlling an operating variable of a motor vehicle wherein the controller has at least one changeable parameter. This parameter of the controller is changed in dependence upon the operating range of the actuator, which is driven by the controller, and/or the magnitude of the change of the desired value.

Claims

1. A method for controlling an operating variable of a motor vehicle which includes an actuator and a controller for driving said actuator in a control loop having an operating range, said controller having at least one changeable parameter (P, I, D), the method comprising the steps of:

forming a changeable desired value (DES) for said operating variable;

detecting an actual value (ACT) of said operating variable;

subdividing said operating range into first and second subranges;

determining at least one of said subranges in dependence upon at least one of the following;

the magnitude of said actual value (ACT) and a magnitude of a change (Δ

DES) of said changeable desired value (DES);

determining the value of said at least one parameter (P, I, D) in dependence upon the determined subrange; and

,

forming a drive signal (S) in dependence upon said desired value (DES), said actual value (ACT) and said at least one parameter (P, I, D) of said controller.

2. The method of claim 1, wherein said actuator drives a throttle flap of an internal combustion engine and said operating variable is the position of said throttle flap.

3. The method of claim 2, wherein said throttle flap has a mechanically set emergency air position;

and, said first operating subrange being below said emergency air position and said second operating subrange being above said emergency air position.

4. The method of claim 1, wherein the method comprises the further step of distinguishing said operating subranges based on said actual value of said operating variable.

5. The method of claim 1, comprising the further steps of:

determining the change in said desired value; and

,

comparing said change to pregiven threshold values and said at least one parameter having a different value depending upon the range of said change of said desired value.

6. The method of claim 1, comprising the further step of providing a characteristic line wherein said at least one parameter of said controller is stored in dependence upon the change of said desired value.

7. The method of claim 4, wherein the dependency of the change of said desired value takes place in at least one of said operating subranges of said control loop.

8. The method of claim 1, comprising the further step of setting said at least one changeable parameter to a standard value when the magnitude of said change of said desired value is constant and the control deviation changes.

9. The method of claim 4, wherein the dependency on the change in said desired value takes place only in one of said operating subranges of said control loop.

10. An arrangement for controlling an operating variable of a motor vehicle, the arrangement comprising:

an electrically actuable actuator;

a controller for driving said actuator in the context of a control loop having an operating range subdivided into first and second subranges and said controller having at least one changeable parameter (P, I, D);

means for forming a desired value (DES) for said operating variable;

means for detecting an actual value (ACT) of said operating variable;

means for determining at least one of said subranges in dependence upon at least one of the following;

the magnitude of said actual value (ACT) and a magnitude of a change (Δ

DES) of said changeable desired value (DES);

means for determining the value of said at least one parameter (P, I, D) in dependence upon the determined subrange; and

,

said controller generating a drive signal (S) in dependence upon said desired value (DES), said actual value (ACT) and said at least one parameter (P, I, D) of said controller for driving said actuator.