Method for operating an internal combustion engine, and a corresponding device

• US 6,814,054 B2
• Filed: 07/17/2002
• Issued: 11/09/2004
• Est. Priority Date: 09/04/2000
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Sauler, Jürgen, Torno, Oskar, Haeming, Werner, Kluth, Carsten, Heinstein, Axel
• Primary Examiner(s): Kwon, John T.
• Application Number:
  US10/129,478
• Publication Number:
  US 20030136378A1
• Time in Patent Office: 846 Days
• Field of Search: 123/406-1-4, 123/406.37, 123/406.38, 123/406.39, 123/406.45, 123/406.47, 123/406.48, 123/568.11, 123/568.28, 123/399, 123/90
• US Class Current: 123/406.21
• CPC Class Codes: F02D 37/02 one of the functions being ignition
• CPC Class Codes: F02D 41/402 Multiple injections
• CPC Class Codes: F02P 5/152 dependent on pinking detecting or indicating knocks in internal-combustion engines G01L23/22
• CPC Class Codes: F02P 5/1521 with particular means during a transient phase, e.g. starting, acceleration, deceleration, gear change
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method for operating an internal combustion engine and a corresponding device are described in which a combustion of a fuel in a fuel-air mixture introduced into a cylinder occurs in at least one cylinder. At least one adjusting device is used to influence at least one physical process, which modifies the distribution of the constituents and/or the overall composition of the fuel-air mixture in the at least one cylinder. If knock occurs, a knock control is used to gradually retard an ignition angle in the at least one cylinder from a fundamental ignition angle by an adjustment angle. When the adjustment of the at least one adjusting device exceeds a specifiable first threshold and/or the change in the at least one physical process exceeds a specifiable second threshold, the adjustment angle is rapidly reduced by increments, the more rapid reduction occurring with a larger increment and/or with a higher frequency of increments.

Claims

1. A method for operating an internal combustion engine, comprising:

performing, in at least one cylinder, combustion of a fuel in a fuel-air mixture introduced into the at least one cylinder;

influencing at least one physical process by at least one adjusting device;

modifying a distribution of at least one of constituents and an overall composition of the fuel-air mixture in the at least one cylinder by the at least one physical process;

retarding gradually, when a knock occurs, an ignition angle in the at least one cylinder by a knock control from a fundamental ignition angle by an adjustment angle; and

reducing rapidly, by increments, the adjustment angle if at least one of an adjustment of the at least one adjusting device exceeds a specifiable first threshold and a change in the at least one physical process exceeds a specifiable second threshold, wherein a more rapid reduction occurs with at least one of a larger increment and a higher frequency of increments.

8. The method according to claim 1, wherein:

the rapid reduction of the adjustment angle occurs for all cylinders simultaneously.

9. The method according to claim 1, wherein:

the rapid reduction of the adjusting angle occurs individually for each cylinder.

10. The method according to claim 1, further comprising:

changing a tracking factor for a calculation of a reference value of a knock detection when the rapid reduction of the adjustment angle is activated.

11. The method according to claim 1, further comprising:

interrupting the rapid reduction of the adjusting angle if at least one of knock occurs, and at least one of a load dynamic and a speed dynamic is present.

2. A method for operating an internal combustion engine, comprising:

performing, in at least one cylinder, combustion of a fuel in a fuel-air mixture introduced into the at least one cylinder;

influencing at least one physical process by at least one adjusting device;

modifying a distribution of at least one of constituents and an overall composition of the fuel-air mixture in the at least one cylinder by the at least one physical process;

retarding gradually, when a knock occurs, an ignition angle in the at least one cylinder by a knock control from a fundamental ignition angle by an adjustment angle; and

reducing rapidly, by increments, the adjustment angle if at least one of an adjustment of the at least one adjusting device exceeds a specifiable first threshold and a chancre in the at least one physical process exceeds a specifiable second threshold, wherein a more rapid reduction occurs with at least one of a larger increment and a higher frequency of increments;

wherein the at least one adjusting device includes at least one of at least one exhaust gas recirculation valve, at least one intake adjustment, at least one exhaust camshaft adjustment, and a variable valve adjustment;

wherein a rate of a recirculated exhaust gas is influenced as the at least one physical process;

wherein the rapid reduction of the adjustment angle occurs when at least one of the following occurs;

a change in the rate of the recirculated exhaust gas exceeds a specifiable rate change threshold,

a change in an exhaust gas recirculation valve adjustment exceeds a specifiable exhaust gas recirculation valve change threshold,

a change in the at least one intake camshaft adjustment exceeds a specifiable intake camshaft change threshold,

a change in the at least one exhaust camshaft adjustment exceeds an exhaust camshaft change threshold, and

a change in the variable valve adjustment exceeds a specifiable first valve change threshold.

3. The method according to claim 2, further comprising:

adding a first advance adjustment angle to the fundamental ignition angle if at least one of the specifiable rate change threshold, the specifiable exhaust gas recirculation valve change threshold, the specifiable intake camshaft change threshold, the exhaust camshaft change threshold and the first valve change threshold is exceeded.

4. A method for operating an internal combustion engine, comprising:

performing, in at least one cylinder, combustion of a fuel in a fuel-air mixture introduced into the at least one cylinder;

influencing at least one physical process by at least one adjusting device;

modifying a distribution of at least one of constituents and an overall composition of the fuel-air mixture in the at least one cylinder by the at least one physical process;

retarding gradually when a knock occurs an ignition angle in the at least one cylinder by a knock control from a fundamental ignition angle by an adjustment angle; and

reducing rapidly, by increments, the adjustment angle if at least one of an adjustment of the at least one adjusting device exceeds a specifiable first threshold and a change in the at least one physical process exceeds a specifiable second threshold, wherein a more rapid reduction occurs with at least one of a larger increment and a higher frequency of increments;

wherein the at least one adjusting device includes at least one charge movement valve;

wherein an intensity of a movement of the fuel-air mixture is influenced as the at least one physical process; and

wherein the rapid reduction of the adjustment angle occurs when a change in position of a charge movement valve exceeds a specifiable charge movement valve change threshold.

5. The method according to claim 4, further comprising:

adding a second advance adjustment angle to the fundamental ignition angle when the specifiable charge movement valve change threshold is exceeded.

6. A method for operating an internal combustion engine comprising:

performing, in at least one cylinder, combustion of a fuel in a fuel-air mixture introduced into the at least one cylinder;

influencing at least one physical process by at least one adjusting device;

modifying a distribution of at least one of constituents and an overall composition of the fuel-air mixture in the at least one cylinder by the at least one physical process;

retarding gradually, when a knock occurs, an ignition angle in the at least one cylinder by a knock control from a fundamental ignition angle by an adjustment angle; and

reducing rapidly, by increments, the adjustment angle if at least one of an adjustment of the at least one adjusting device exceeds a specifiable first threshold and a chance in the at least one physical process exceeds a specifiable second threshold, wherein a more rapid reduction occurs with at least one of a larger increment and a higher frequency of increments;

wherein the at least one adjusting device includes one of at least one intake camshaft adjustment, at least one exhaust camshaft adjustment, and one variable valve control;

wherein a volume of one of a fresh air supplied and the fuel-air mixture is influenced as the at least one physical process; and

wherein the rapid reduction of the adjustment angle occurs when at least one of the following occurs;

at least one of a change in the at least one intake camshaft adjustment exceeds a specifiable intake camshaft change threshold and a change in the at least one exhaust camshaft adjustment exceeds a specifiable exhaust camshaft change threshold, and

a change in a variable valve adjustment exceeds a specifiable second valve change threshold.

7. The method according to claim 6, further comprising:

adding a third advance adjustment angle to the fundamental ignition angle if at least one of the specifiable intake camshaft change threshold, the specifiable exhaust camshaft change threshold, and the specifiable second valve change threshold is exceeded.