초록 ▼

In order to permit diagnosis of operation and function parameters in a motor vehicle which is equipped with an electronic microprocessor control system without the necessity of providing in the diagnostic equipment substantial additional memory capability, the control system includes a sub-program f

In order to permit diagnosis of operation and function parameters in a motor vehicle which is equipped with an electronic microprocessor control system without the necessity of providing in the diagnostic equipment substantial additional memory capability, the control system includes a sub-program for diagnosis. A first subprogram executed by the control system in response to a command from the diagnostic equipment gives the appropriate actual operational data to the diagnostic equipment. A second subprogram simulates nominal values for specific vehicle data under various operating conditions and compares these with the actual values. The resulting information is given to an operator by a display and can additionally include various instructions, e.g. repair instructions or a trouble shooting sequence based on the diagnosis.

대표청구항 ▼

In a motor vehicle, the combination of apparatus forming part of the motor vehicle for electronically controlling functional elements of the vehicle and their operating functions including at least one of: ignition firing; fuel injection, wherein the apparatus includes an on-board microcomputer syst

In a motor vehicle, the combination of apparatus forming part of the motor vehicle for electronically controlling functional elements of the vehicle and their operating functions including at least one of: ignition firing; fuel injection, wherein the apparatus includes an on-board microcomputer system (62) comprising a microprocessor unit (10), at least one fixed value memory unit (12-ROM, PROM, EPROM) storing operating and function data of the vehicle, a working memory unit (11-RAM), an input/output unit (13), a data bus (14) and an address bus (15), said buses interconnecting said units; at least one signal source (U, T, L, 30-39) coupled to a functional element of the motor vehicle and a signal processing circuit (29) connected to the respective signal source and providing one or more vehicle function parameter-dependent signals to the input/output unit (13); and at least one output element (47-58) connected to and controlled by said input/output unit, coupled to a functional element of the motor vehicle and controlling an operating function of the vehicle; with a monitoring and supervisory apparatus connectable to receive at least one vehicle function parameter-dependent signal derived from at least one of said signal sources, including a diagnostic equipment unit (61) connected to the input/output unit (13) and having a comparison diagnostic unit (61); means (12a, 12b) forming part of said fixed value memory unit (12) of the on-board microcomputer system (62) for storing data representative of a diagnostic program including data representative of predetermined operating functions and diagnosis test command data, and connection means (14,15) for selectively connecting (a) data representative of the diagnostic program into said microcomputer system (62) for processing in accordance with the diagnosis test command data; and (b) data representative of predetermined operating functions to said input/output unit (13) and connection of at least one output element to the diagnostic equipment unit (66) to permit control of the respective output element from the stored data representative of said functions upon failure or malfunction of or in said microcomputer system (62) or in one of said signal sources.