Method of and device for determination of characteristic values of an internal combustion engine

• US 6,327,531 B1
• Filed: 02/22/2000
• Issued: 12/04/2001
• Est. Priority Date: 02/25/1999
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Philipp, Matthias, Huynh, Henri, Sobottka, Christian
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US09/510,451
• Time in Patent Office: 651 Days
• Field of Search: 123/339.2, 701/101, 701/102, 701/103, 701/104, 701/105, 701/106, 701/114, 701/115, 701/50
• US Class Current: 701/115
• CPC Class Codes: F02D 2041/1433 using a model or simulation of the system
• CPC Class Codes: F02D 41/1401 characterised by the control or regulation method F02D41/1473, F02D41/1477 take precedence
• CPC Class Codes: F02D 41/3029 further comprising a homogeneous charge spark-ignited mode
• CPC Class Codes: G05B 17/02 electric

Abstract

In a method of and device for providing data of a model for determination of characteristic variables for controlling an internal combustion engine, in particular an internal combustion engine with direct injection or suction pipe injection, for each predetermined operation point of the internal combustion engine at least one local model in particular of low order is provided with data.

Claims

1. A control device for operation of an internal combustion engine, comprising a memory formed as a read-only-memory;

a computing device formed as a microprocessor, said memory being formed so as to store a program which is outputtable to said computing device and suitable for performing a method including the steps of providing data of at least one local model of low order for each predetermined operation point of an internal combustion engine.

2. A method for providing data of a model for determining characteristic variables for controlling an internal combustion engine, the method comprising the steps of providing data of at least one local model of low order for each predetermined operation point of an internal combustion engine, said providing includes forming the local model of a polynom of a second order with alternating actions of a first order.

3. A method for providing data of a model for determining characteristic variables for controlling an internal combustion engine, the method comprising the steps of providing data of at least one local model of low order for each predetermined operation point of an internal combustion engine, said providing includes providing the at least one local model of the internal combustion engine which has a direct injection;

selecting variables which are representative of an operation point as a rotary speed MNOT and a fuel mass signal RK or a rotary speed and MOT and a fresh gas cylinder filling RL;

selecting actuating values as at least two values of the following values;

lambda LAM, ignition angle ZV, angle of injections of an injection start WESB, suction pipe pressure PS, a ratio of suction pipe pressure to surrounding pressure PS/PU, a rate of an exhaust gas return AGR, a fuel pressure DRAIL, valve overlapping VVS, position of a charge movement flap LB;

selecting as operational variable at least one variable of the following;

fuel consumption BE, moment M, average combustion pressure PMI, hydrocarbon emission EHC, nitrogen emission ENO_X, knock signal KI, running unquiteness value LU, exhaust gas temperature tab, soot fraction in exhaust gas SZB.

4. A method as defined in claim 3;

and further comprising selecting as the actuating variables at least the following variables;

lambda LAM, ignition angle ZW, angle of an injection start WESB, suction pipe pressure PS, a ratio of suction pipe pressure to surrounding pressure PS/PU, rate of exhaust gas return AGR, fuel pressure PRAIL, valve overlapping VVS, position of a charge movement flap LP.

5. A method for providing data of a model for determining characteristic variables for controlling an internal combustion engine, the method comprising the steps of providing data of at least one local model of low order for each predetermined operation point of an internal combustion engine.

6. A method as defined in claim 5, wherein said providing includes providing the model as a model for selected operation variables of the internal combustion engine, with which on a basis of variables which are represented of the operation points and of actuating variables of the internal combustion engine, operation variables of the internal combustion engine are determined.

7. A method as defined in claim 5, and further comprising the step of determining an optimal number of measuring points for providing date of the local model by means of statistic expressions via dissipation of measuring values, for determining the model and minimizing a model error E.

8. A method as defined in claim 5, and further comprising determining coefficients of the model by multiple regressions by minimizing a model error E.

9. A method as defined in claim 5, and further comprising completing the model for controlling an element selected from the group consisting of a transmission, a brake device, and a further electromechanical system.