Petr Kocourek - Academia.edu (original) (raw)
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Uttar Pradesh Technical University
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This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a... more This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a new communication standard intended to be used in cars in the near future. It is primarily intended for communication among so-called x-by-wire systems. Many fundamental and advanced features of FR standard, as well as basic kinds of x-by-wire systems, can be demonstrated by this educational system. The largest benefit is in an illustrative presentation of the FR synchronization mechanism (SM) in operation, as well as of its robustness. The SM is probably the most important FR process, and provides synchronization among time bases in a FR network. The educational system allows the disturbance of the time bases by modification of clock frequency. External generators are used for this purpose. The changes in SM behaviour can be observed as a result of time base disturbing. The most interesting observation is to what degree the SM is able to cope with this clock frequency fluctuation. No similar FR educational systems have previously been equipped with a possibility like this.
This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a... more This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a new communication standard intended to be used in cars in the near future. It is primarily intended for communication among so-called x-by-wire systems. Many fundamental and advanced features of FR standard, as well as basic kinds of x-by-wire systems, can be demonstrated by this educational system. The largest benefit is in an illustrative presentation of the FR synchronization mechanism (SM) in operation, as well as of its robustness. The SM is probably the most important FR process, and provides synchronization among time bases in a FR network. The educational system allows the disturbance of the time bases by modification of clock frequency. External generators are used for this purpose. The changes in SM behaviour can be observed as a result of time base disturbing. The most interesting observation is to what degree the SM is able to cope with this clock frequency fluctuation. No similar FR educational systems have previously been equipped with a possibility like this.
CAN communication is nowadays the basic way for information exchange among the Electronic Control... more CAN communication is nowadays the basic way for information exchange among the Electronic Control Units (ECUs) that control particular vehicle functionality. Correct and in-time data delivery from other units is the underlying presumption of the proper ECU function. As the CAN is rather complex standard, the detailed testing of ECU behavior is necessary at all protocol layers of the communication stack. In order to simplify the testing and to reduce the human factor influence the automated test site has been designed and implemented, which realizes more than 50 physical, link and application protocol layer tests. For some of them specialized test instruments (like CAN generator or CAN trigger unit) were designed that allow influencing the communication events in real-time, as well as instruments allowing real-time simulation of complete bus traffic. The use of programmable logic for hardware implementation allows modifying instruments functionality without changes in a hardware structure. The time to run the complete test was reduced more than 10 times compared to previously used manual measurement and evaluation. The paper describes methods and their implementation used for the testing the ECUs behavior at the CAN interface. can be divided into several groups, according to the development phase in which they are applied. One of them is the functional testing, focused on the accurate acquisition of input data and in-time evaluation of correct outputs used either directly for system control or as the inputs for other components in the system. It includes both the component hardware and software testing. In case the device under test is a part of distributed system, the testing of communication channel parameters and its behavior under variety of conditions has a crucial importance, as errors in one device can cause the whole system failure.
This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a... more This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a new communication standard intended to be used in cars in the near future. It is primarily intended for communication among so-called x-by-wire systems. Many fundamental and advanced features of FR standard, as well as basic kinds of x-by-wire systems, can be demonstrated by this educational system. The largest benefit is in an illustrative presentation of the FR synchronization mechanism (SM) in operation, as well as of its robustness. The SM is probably the most important FR process, and provides synchronization among time bases in a FR network. The educational system allows the disturbance of the time bases by modification of clock frequency. External generators are used for this purpose. The changes in SM behaviour can be observed as a result of time base disturbing. The most interesting observation is to what degree the SM is able to cope with this clock frequency fluctuation. No similar FR educational systems have previously been equipped with a possibility like this.
This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a... more This work deals with an educational system for the teaching of standard FlexRay (FR). The FR is a new communication standard intended to be used in cars in the near future. It is primarily intended for communication among so-called x-by-wire systems. Many fundamental and advanced features of FR standard, as well as basic kinds of x-by-wire systems, can be demonstrated by this educational system. The largest benefit is in an illustrative presentation of the FR synchronization mechanism (SM) in operation, as well as of its robustness. The SM is probably the most important FR process, and provides synchronization among time bases in a FR network. The educational system allows the disturbance of the time bases by modification of clock frequency. External generators are used for this purpose. The changes in SM behaviour can be observed as a result of time base disturbing. The most interesting observation is to what degree the SM is able to cope with this clock frequency fluctuation. No similar FR educational systems have previously been equipped with a possibility like this.
CAN communication is nowadays the basic way for information exchange among the Electronic Control... more CAN communication is nowadays the basic way for information exchange among the Electronic Control Units (ECUs) that control particular vehicle functionality. Correct and in-time data delivery from other units is the underlying presumption of the proper ECU function. As the CAN is rather complex standard, the detailed testing of ECU behavior is necessary at all protocol layers of the communication stack. In order to simplify the testing and to reduce the human factor influence the automated test site has been designed and implemented, which realizes more than 50 physical, link and application protocol layer tests. For some of them specialized test instruments (like CAN generator or CAN trigger unit) were designed that allow influencing the communication events in real-time, as well as instruments allowing real-time simulation of complete bus traffic. The use of programmable logic for hardware implementation allows modifying instruments functionality without changes in a hardware structure. The time to run the complete test was reduced more than 10 times compared to previously used manual measurement and evaluation. The paper describes methods and their implementation used for the testing the ECUs behavior at the CAN interface. can be divided into several groups, according to the development phase in which they are applied. One of them is the functional testing, focused on the accurate acquisition of input data and in-time evaluation of correct outputs used either directly for system control or as the inputs for other components in the system. It includes both the component hardware and software testing. In case the device under test is a part of distributed system, the testing of communication channel parameters and its behavior under variety of conditions has a crucial importance, as errors in one device can cause the whole system failure.