Procedure for the operation of an internal combustion engine

• US 7,680,584 B2
• Filed: 07/25/2007
• Issued: 03/16/2010
• Est. Priority Date: 07/27/2006
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Haering, Juergen, Sauer, Christina, Casal Kulzer, Andre F., Fischer, Wolfgang, Karrelmeyer, Roland
• Primary Examiner(s): Wolfe, Jr.; Willis R
• Application Number:
  US11/880,958
• Publication Number:
  US 20090024302A1
• Time in Patent Office: 965 Days
• Field of Search: 123/295, 123/305, 123/347, 123/348, 123/399, 123/403, 123/568.11, 123/568.14, 123/568.21, 123 9015- 9018, 701101-105, 701/108, 701/111, 701/115
• US Class Current: 701/105
• CPC Class Codes: F02B 1/12 with compression ignition with fuel-air charge ignited by compression ignition of an additional fuel F02B7/00
• CPC Class Codes: F02B 17/005 having direct injection in the combustion chamber
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02D 13/0215 changing the valve timing only
• CPC Class Codes: F02D 13/0261 Controlling the valve overlap
• CPC Class Codes: F02D 13/0265 Negative valve overlap for temporarily storing residual gas in the cylinder
• CPC Class Codes: F02D 13/0273 Multiple actuations of a valve within an engine cycle
• CPC Class Codes: F02D 2041/001 for engines with variable valve actuation
• CPC Class Codes: F02D 2250/21 during a transition between engine operation modes or states
• CPC Class Codes: F02D 41/006 using internal EGR control of valve overlap for internal EGR F02D13/0261; arrangements for internal EGR F02M26/01
• CPC Class Codes: F02D 41/3035 a mode being the premixed charge compression-ignition mode
• CPC Class Codes: F02D 41/345 Controlling injection timing F02D41/365 takes precedence
• CPC Class Codes: F02D 41/402 Multiple injections
• CPC Class Codes: F02M 26/01 Internal exhaust gas recirculation, i.e. wherein the residual exhaust gases are trapped in the cylinder or pushed back from the intake or the exhaust manifold into the combustion chamber without the use of additional passages
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A method of operating an internal combustion engine with direct gasoline injection and controlled self-ignition, wherein the internal combustion engine includes a combustion chamber, at least one intake valve and at least one exhaust valve each having an adjustable opening time. The method includes compressing an ignitable gas mixture that contains residual gas in the combustion chamber during a compression stroke, where the gas mixture self ignites, and altering step-wise over multiple combustion cycles at least one of a residual gas volume and a point of injection time to an interim value other than a value assigned to a target load during a load transfer from an initial load to the target load.

Claims

1. A control unit configured to control operation of an internal combustion engine, particularly a gasoline engine with direct gasoline injection and controlled self-ignition, wherein the internal combustion engine comprises a combustion chamber, at least one intake valve and at least one exhaust valve each having an adjustable opening time, the control unit executing instructions causing compression of an ignitable mixture that contains residual gas in the combustion chamber during a compression stroke, wherein the gas mixture self ignites during the compression stroke, and wherein during a load transfer from an initial load to a target load, at least one of a residual gas volume and an injection point of time is altered step-wise over multiple combustion cycles to an interim value other than the value assigned to the target load.

6. A method according to claim 1, further comprising during a load transfer from a low to a high load, advancing the point of injection time is advanced for at least one power stroke to an interim value and subsequently retarding the point of injection time step-by-step to a target value.

7. A method according to claim 1, further comprising during a load transfer from a high to a low load, retarding the point of injection time for at least one power stroke to an interim value and subsequently advancing the point of injection time step-by-step to a target value.

2. A computer program that operates an internal combustion engine with a program code for the implementation of instructions, if the program is executed on a computer, the computer program comprising instructions for

compressing an ignitable gas mixture that contains residual gas in the combustion chamber during a compression stroke, wherein the gas mixture self ignites;

and

altering step-wise over multiple combustion cycles at least one of a residual gas volume and a point of injection time to an interim value other than a value assigned to a target load during a load transfer from an initial load to the target load.

3. A method of operating an internal combustion engine with direct gasoline injection and controlled self-ignition, wherein the internal combustion engine comprises a combustion chamber, at least one intake valve, and at least one exhaust valve, wherein the at least one intake valve and at least one exhaust each have an adjustable opening time, the method comprising:

compressing an ignitable gas mixture that contains residual gas in the combustion chamber during a compression stroke wherein the gas mixture self ignites; and

altering step-wise over multiple combustion cycles at least one of a residual gas volume and a point of injection time to an interim value other than a value assigned to a target load during a load transfer from an initial load to the target load.

4. A method according to claim 3, further comprising during a load transfer from a low to a high load, increasing the residual gas volume for at least one power stroke to an interim value and subsequently decreasing the residual gas volume step-by-step to the target value.

5. A method according to claim 3, further comprising during a load transfer from a high to a low load, decreasing the residual gas volume for at least one power stroke to an interim value and subsequently increasing the residual gas volume step-by-step to the target value.