Method and system for controlling operation of an apparatus or engine, particularly internal combustion engine

• US 4,677,558 A
• Filed: 01/17/1985
• Issued: 06/30/1987
• Est. Priority Date: 03/03/1984
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Bohmler, Heinz, Daumer, Rolf
• Primary Examiner(s): Lall, Parshotam S.
• Application Number:
  US06/692,381
• Time in Patent Office: 894 Days
• Field of Search: 364/431.03, 364/431.05, 364/431.04, 364/431.12, 364/424, 364/200, 364/900, 123/480
• US Class Current: 701/102
• CPC Class Codes: F02D 41/2409 Addressing techniques specially adapted therefor
• CPC Class Codes: F02D 41/263 the program execution being modifiable by physical parameters
• CPC Class Codes: G06F 8/654 using techniques specially adapted for alterable solid state memories, e.g. for EEPROM or flash memories

Abstract

To permit change of data, to be used in a fixed program carried out by a microprocessor (1) in accordance with a stored program (2), upon change in operating characteristics of a controlled apparatus (M), for example an internal combustion engine, an erasable programmable read-only memory (3) is provided, which is external to the microprocessor (1). The external memory (3) forms a combined address and data memory having at least one address field (4), and a vector field (5). A constant data field (7) and a table, or function data field (6) are part of the external memory (3), which data fields contain data to be addressed directly through the address field or via the vector field for not only a single type or series of apparatus, such as ICEs, but also additional engines, or engine characteristics, for example due to aging. In order to run the program by the microprocessor 1, with a changed or aged engine, then, it is only necessary to change the address of the data in the data field and/or the vector field to provide different output data for any given programming step.

Claims

1. Electronic control system for control of at least one of fuel injection and fuel ignition in a combustion motor (M), particularly for control of an internal combustion engine (ICE), having

a computer or microprocessor (1);

a permanent program memory (2) containing a program for execution by the computer, and forming a part thereof;

an external memory (3) containing data specific to the operation of the motor (M), connected to the computer for interrogation by the computer, to retrieve data therefrom in accordance with computation programs stored in the program memory (2) of the computer,

a bus (1a) interconnecting said computer (1), program memory (2), and external memory (3) and said motor (M), for controlling said motor (M);

wherein, in accordance with the invention,

said computer (1) triggers at least one of fuel injection and fuel ignition by sending a control signal over said bus (1a) to said motor (M);

the external memory (3) is an Eraseable Programmable Read-Only Memory (EPROM) and forms a combined address-and-data memory having

at least one address field (4) connected to be addressed by the computer (1) in accordance with said program stored in the program memory (2) of the computer;

a vector field (5);

and a data field (8),

the address field containing the address of at least one of;

the vector field (5;

B1, B2, . . . Bm); and

the data field (8;

6;

C1 . . . C12, Cr;

7;

D1, D2 . . . Ds);

wherein the vector field (5) contains data addresses of data in the data field (8;

6,

     7); and

wherein the data field (8;

6,

     7) stores at respective addresses the operating data specific to the operation of the combustion motor (M);

said EPROM being capable of being erased and reprogrammed without modification of said permanent memory (2) in said computer (1).

2. System according to claim 1, wherein the data field (8) in the external memory (3) comprises a constant data field (7) to store fixed constant values, and a function data field (6) storing functional relationships;

and wherein the constant data field (7) is addressed directly from the address field (4) and the function data field (6) is addressed by the vector field (5), the vector field, in turn, being addressed by the address field.

3. System according to claim 2, wherein the external memory (3) comprises an erasable programmable read-only memory (EPROM).

4. Method of triggering at least one of fuel injection and fuel ignition in a motor (M), particularly an internal combustion engine, by a microprocessor or computer (1) having a bus connection (1a) to said motor (M) for controlling said motor (M), said computer having a program memory (2) which stores a program for execution by the computer or microprocessor, and in which data specific to the operation of the particular model of said motor are stored in an external memory (3), and are retrievable, as desired, under control of the program stored in the program memory,

comprising the steps of

providing a basic triggering program in the program memory (2), which program includes initial memory addresses (A1, A2, . . . An) forming part of an address field (4) in the external memory (3);

providing, in an eraseable manner, data specific to the operation of at least one particular model of said motor in said external memory (3);

transferring said basic addresses to the microprocessor (1);

loading the contents of the respective initial addresses (A1, A2, . . . An) of the address field of the external memory (3) into the microprocessor;

providing the address of at least one of;

a vector field (5;

B1, B2, . . . Bm) and

a data field (8;

6;

C1 . . . C12, Cr;

7;

D1, D2 . . . Ds) in the external memory (3) and storing the addresses of the respective data field (8) or vector field (5) at the memory locations designated by the initial addresses of the address field (4);

loading into the microprocessor each respective address (D1, B3, . . . ) of the vector field or data field (5,

     8), as stored in the memory locations corresponding to addresses (A1, A2, . . . An) contained in said basic triggering program;

alternatively retrieving data (x) from the data field (8;

6,

     7), if the address loaded (D1) is within said data field, or, it the address loaded (B3) is within said vector field (5), retrieving data from an address (C12) pointed to by a vector stored at the address (B3)in the vector field;

processing the retrieved data in the microprocessor; and

triggering at least one of fuel injection and fuel ignition in said motor by generating a signal over said bus connection (1a) in accordance with said triggering program and said processing of the retrieved data,

whereby execution of said steps may be modified, without altering said basic triggering program in said program memory (2), by providing modified data in at least one of said address field (4), said vector field (5), and said data field (8).

5. Method according to claim 4, wherein the data field (8) is subdivided into a constant data field (7) and a function or table data field (6);

and wherein said retrieval step comprises;

(1) retrieving constant data from the constant data field (7) based on addresses stored in the address field (4);

and retrieving data stored in the function field (6) based on the contents of addresses stored in the vector field, which addresses in the vector field, in turn, are derived from addresses stored in the address field (4).