Diagnosis system for motor vehicle
First Claim
1. A diagnosis system for a motor vehicle, having sensing means for sensing operating conditions of the vehicle as input data, a plurality of electronic control units being responsive to the input data from the sensing means for providing output data for controlling the vehicle, independently, a diagnosis unit for sending a demand signal demanding specific data of the input and output data to the electronic control units for diagnosing the specific data and connecting means provided with a bus and a connector for connecting the diagnosis unit to the electronic control units in parallel to communicate bidirectionally, comprising:
- a clock signal line connecting the diagnosis unit to at least one of the electronic control units to transmit a clock signal therebetween;
first communication means for transmitting the demand signal and the specific data between the diagnosis unit and said at least one of the electronic control units in a clock synchronous communication in synchronous to said clock signal;
second communication means for transmitting the demand signal and the specific data in a start-stop synchronous communication through the connecting means between the diagnosis unit and the other of the electronic control units;
a keyboard for inputting into the diagnosis unit a diagnosis mode designating an unit to be accessed of the electronic control units; and
interpretation means for interpretating said designated unit from said diagnosis mode and for selecting one of said first and second communication means matching said designated unit so as to perform every diagnosis item dependent on different communication types at one time without disconnecting the connector.
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Accused Products
Abstract
There is disclosed a diagnosis system for a motor vehicle, and comprising a plurality of and various electronic control units mounted on the vehicle, and a diagnosis unit connected to the control units and for diagnosing troubles occurring in the several control units. The system further comprises a plurality of communication circuits provided in the diagnosis unit corresponding to every communication systems of the control units, a communication bus provided to connect the control units in parallel to the diagnosis unit, and one external connector for connecting the bus to the diagnosis unit. Accordingly, it is possible for the system to respond to every trouble of the control unit despite different communication systems, without changing connectors, and providing a plurality of communication buses.
87 Citations
7 Claims
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1. A diagnosis system for a motor vehicle, having sensing means for sensing operating conditions of the vehicle as input data, a plurality of electronic control units being responsive to the input data from the sensing means for providing output data for controlling the vehicle, independently, a diagnosis unit for sending a demand signal demanding specific data of the input and output data to the electronic control units for diagnosing the specific data and connecting means provided with a bus and a connector for connecting the diagnosis unit to the electronic control units in parallel to communicate bidirectionally, comprising:
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a clock signal line connecting the diagnosis unit to at least one of the electronic control units to transmit a clock signal therebetween; first communication means for transmitting the demand signal and the specific data between the diagnosis unit and said at least one of the electronic control units in a clock synchronous communication in synchronous to said clock signal; second communication means for transmitting the demand signal and the specific data in a start-stop synchronous communication through the connecting means between the diagnosis unit and the other of the electronic control units; a keyboard for inputting into the diagnosis unit a diagnosis mode designating an unit to be accessed of the electronic control units; and interpretation means for interpretating said designated unit from said diagnosis mode and for selecting one of said first and second communication means matching said designated unit so as to perform every diagnosis item dependent on different communication types at one time without disconnecting the connector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification