Adaptive gains for electronic air intake throttle control

• US 7,533,654 B1
• Filed: 02/29/2008
• Issued: 05/19/2009
• Est. Priority Date: 02/29/2008
• Status: Expired due to Fees

• Current Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Original Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Inventors: Zurawski, Mark Allen
• Primary Examiner(s): KWON, JOHN
• Application Number:
  US12/040,052
• Time in Patent Office: 445 Days
• Field of Search: 123/376, 123/398, 123/399, 123/400, 123/403, 123/462
• US Class Current: 123/376
• 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 11/107 Safety-related aspects
• CPC Class Codes: F02D 2041/0017 by simultaneous control of throttle and exhaust gas recirculation
• CPC Class Codes: F02D 2041/1422 Variable gain or coefficients
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for determining a coefficient gain to a signal command to actuate an air intake throttle plate to ensure that the throttle plate responds in a desired manner within a desired responsiveness with relative conformity over the life of the air intake manifold with out losses due to variability in spring/motor/friction responsiveness in the throttle plate actuator. The coefficient gain is multiplied to successive throttle plate command signals to ensure the throttle plate responds as desired. The coefficient gain is re-determined periodically when it is determined that the throttle plate responsiveness does not meet desired throttle plate responsiveness.

Claims

1. A method to operate a spring actuated electronic air throttle control in an electronic controlled internal combustion engine with an engine control system having memory comprising

determining a desired responsiveness of a throttle plate in an electronic control air throttle assembly;

determining actual responsiveness of a throttle plate in an electronic control air throttle assembly;

determining a coefficient gain for the throttle plate based upon responsiveness of the spring and storing said gain in memory;

multiplying the coefficient gain to a throttle plate actuation command to operate said throttle plate to compensate for loss of spring or motor action during said throttle plate life and conform the actual throttle plate responsiveness to a determine throttle plate responsiveness.

2. The method of claim 1, wherein said coefficient gain is a value multiplied to an actuation command current to effect movement of the throttle plate to a desired position.

3. The method of claim 1 wherein said coefficient gain is determined by applying a fixed current to said throttle plate actuator to open and close a throttle plate a predetermined number of times;

determining a maximum amount of time, a minimum amount of time, said coefficient gain being a mean amount of time for said throttle plate to open or close in response to said fixed current signal.

4. The method of claim 1, wherein said coefficient gain is continuously re-determined and multiplied to successive throttle plate actuation commands.

5. A method to operate an electronic controlled internal combustion engine with a spring actuated electronic controlled air intake manifold equipped with a throttle plate;

said electronic controlled internal combustion engine equipped with an engine control system (ECS) with memory and in electronic communication with said air intake manifold;

said method comprising;

determining actual responsiveness of said spring actuate throttle plate in said air intake manifold in response to a signal command from said Engine Control System;

comparing said actual responsiveness of said throttle plate to a desired throttle plate responsiveness in memory;

multiplying a coefficient gain to successive signal commands from said Engine Control System to conform successive actual responsiveness times to said desired responsiveness time to compensate for loss of responsiveness in successive throttle plate actuations due to spring and/or motor variability in said air intake manifold and storing said coefficient gain in memory;

multiplying a coefficient gain to successive air intake throttle command signals from said Engine Control System and comparing the successive actual responsiveness of the throttle plate with desired responsiveness of the throttle plate to determine a new coefficient gain to be applied to ensure said throttle plate actuation is comparable to a desired throttle plate responsiveness.

6. The method of claim 5, wherein said coefficient gain is a value multiplied to an actuation command current to effect movement of the throttle plate to a desired position.

7. The method of claim 5, wherein said coefficient gain is determined by applying a fixed current to said throttle plate actuator to open and close a throttle plate a predetermined number of times;

determining a maximum amount of time, a minimum amount of time, said coefficient gain being a mean amount of time for said throttle plate to open or close in response to said fixed current signal.

8. The method of claim 5, wherein said coefficient gain is continuously re-determined and multiplied to successive throttle plate actuation commands.