Method and device for controlling an actuator element

• US 5,957,109 A
• Filed: 08/25/1998
• Issued: 09/28/1999
• Est. Priority Date: 09/23/1995
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Dorr, Wolfgang, Tauscher, Joachim, Schonfelder, Dietbert, Barbehon, Kai-Lars
• Primary Examiner(s): Moulis, Thomas N.
• Application Number:
  US09/043,401
• Time in Patent Office: 399 Days
• Field of Search: 123/357, 123/500, 123/501, 123/502
• US Class Current: 123/357
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: H02P 8/32 Reducing overshoot or oscillation, e.g. damping

Abstract

A process and device for triggering an actuator are described, in particular an actuator triggered in cycles for an internal combustion engine. The triggering signal frequency can be changed to prevent resonance effects. The triggering signal frequency is varied between a first and a second limit value over time according to a preselected function.

Claims

1. A process for triggering an actuator in cycles, the process comprising the steps of:

detecting an engine speed value;

determining whether the engine speed value is within a predetermined value range; and

when the engine speed value is within the predetermined value range, varying a triggering signal frequency over time according to a predetermined function, the predetermined function being independent of the engine speed value, wherein the triggering signal frequency is varied to prevent resonance effects.

2. The process according to claim 1, wherein the actuator is triggered in cycles of an internal combustion engine.

3. The process according to claim 1, wherein the step of varying the triggering signal frequency over time according to the predetermined function includes the step of:

starting from a first frequency value, increasing the triggering signal frequency over time in a linear manner.

4. The process according to claim 1, wherein the step of varying the triggering signal frequency over time according to the predetermined function includes the step of:

linearly increasing the triggering signal frequency.

5. The process according to claim 3, wherein the step of varying the triggering signal frequency over time according to the predetermined function includes the step of:

increasing the triggering signal frequency until a second frequency value is reached.

6. The process according to claim 1, wherein the step of varying the triggering signal frequency over time according to the predetermined function includes the step of:

starting from a preselected frequency value, decreasing the triggering signal frequency over time.

7. The process according to claim 1, further comprising the step of:

if the engine speed value is outside of the predetermined value range, decreasing the triggering signal frequency.

8. The process according to claim 7, wherein the step of decreasing the triggering signal frequency includes the step of:

decreasing the triggering signal frequency until a first frequency value is reached.

12. The process according to claim 1, wherein the triggering signal frequency assumes a constant value when the engine speed value is outside of the predetermined value range.

13. The process according to claim 1, wherein the step of varying the triggering signal frequency over time according to the predetermined function includes the step of:

generating a triggering signal frequency value over a range of values between a first frequency value and a second frequency value according to the predetermined function.

9. A device for triggering an actuator, comprising:

an adjusting arrangement for determining whether an engine speed value is within a predetermined value range and for varying a triggering signal frequency over time, when the engine speed value is within the predetermined value range, according to a predetermined function, the predetermined function being independent of the engine speed value, wherein the triggering signal frequency is changed to prevent resonance effects.

10. The device according to claim 9, wherein the actuator is triggered in cycles of an internal combustion engine.

11. The device according to claim 9, wherein the actuator adjusts an injection actuator of a self-igniting internal combustion engine.