METHOD FOR OPERATING A FUEL INJECTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE

• US 20110288748A1
• Filed: 12/07/2009
• Published: 11/24/2011
• Est. Priority Date: 12/11/2008
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Richter, Uwe, Maess, Matthias, Kuempel, Joerg, Schumacher, Matthias, Wilms, Rainer
• Granted Patent: US 9,121,360 B2
• Time in Patent Office: Days
• US Class Current: 701/103
• CPC Class Codes: F02D 2041/2027 Control of the current by pulse width modulation or duty cycle control
• CPC Class Codes: F02D 2041/2037 for preventing bouncing of the valve needle
• CPC Class Codes: F02D 2041/2055 with means for determining actual opening or closing time
• CPC Class Codes: F02D 2200/0602 Fuel pressure
• CPC Class Codes: F02D 41/20 Output circuits, e.g. for controlling currents in command coils
• CPC Class Codes: F02D 41/2464 Characteristics of actuators
• CPC Class Codes: F02D 41/345 Controlling injection timing F02D41/365 takes precedence
• CPC Class Codes: F02D 41/3845 by controlling the flow into the common rail, e.g. the amount of fuel pumped
• CPC Class Codes: F02D 41/401 Controlling injection timing F02D41/402 takes precedence

Abstract

In a fuel injection system of an internal combustion engine fuel is delivered into a fuel rail by a high-pressure pump. The quantity of the delivered fuel is influenced by a quantity control valve operated by an electromagnetic operating device. At least one parameter of a braking pulse of the electromagnetic actuating device depends on an efficiency of the electromagnetic actuating device and/or on a supply voltage of a voltage source and/or on a temperature, in particular of a component of the fuel injection system or of the internal combustion engine.

Claims

1-11. -11. (canceled)

12. A method for operating a fuel injection system of an internal combustion engine, comprising:

delivering fuel by a high-pressure pump into a fuel rail; and

influencing a quantity of the delivered fuel by a quantity control valve operated by an electromagnetic operating device, at least one parameter of a braking pulse of the electromagnetic operating device depending on at least one of (a) an efficiency of the electromagnetic operating device, (b) a voltage of a voltage source, (c) a temperature, and (d) a temperature of at least component of at least one of (a) the fuel injection system and (b) or of the internal combustion engine;

wherein the braking pulse at least one of (a) occurs later, (b) has a shorter duration, and (c) is weaker in the case of an electromagnetic operating device having a higher level of efficiency than in the case of an electromagnetic operating device having a lower level of efficiency.

13. The method according to claim 12, wherein a power supplied to the electromagnetic operating device is altered successively in an adaptation method from a starting value up to such a final value at which closing or opening of the magnetic control valve is at least indirectly no longer or just barely detected and the final value or a variable based on the final value is used to characterize the efficiency of the electromagnetic operating device.

14. The method according to claim 12, wherein the parameter includes at least one of a start of the braking pulse, a duration of a PWM phase or a current-controlled phase of the braking pulse, a duration of a pick-up pulse, which occurs before the first PWM phase, a pulse duty factor or a current level during a holding phase before the braking pulse and/or a pulse duty factor or a current level at the end of a holding phase before the braking pulse.

15. The method according to claim 12, wherein an opening or closing of the solenoid valve is detected by monitoring a deviation of an actual pressure in the fuel rail from a setpoint pressure.

16. The method according to claim 12, wherein a shape of the braking pulse is defined by sequences of a plurality of PWM phases, pick-up pulse phases without PWM, current-controlled phases, defined stage quenches and/or Zener quenches.

17. The method according to claim 12, wherein an energized holding phase of the electromagnetic operating device begins during a delivery stroke and is terminated after the end of the delivery stroke.

18. The method according to claim 12, wherein a holding phase is terminated at a defined or falling, PWM flank during triggering with PWM.

19. A non-transitory computer-readable storage medium, for at least one of (a) a control device and (b) a regulating device of a fuel injection system, with an executable program stored thereon, wherein the program instructs a microprocessor to perform a method as recited in claim 12.

20. A device for at least one of controlling and regulating a fuel injection system, the device adapted to perform the method recited in claim 12.