Development of Hardware-In-Loop Automated Test Bench for Liquid-Assisted After-Treatment Controls System's Regression Tests

The Liquid-Assisted-After-Treatment control system contains a doser along with a set of sensors and actuators to treat the hazardous exhaust gases from automotive engines within permissible levels as per statutory regulations i.e. On-Board-Diagnostics (OBD) – II. This system needs to be tested against large number of possible faults known as Regression-Tests. This is conventionally done by manually simulating the fault-conditions. Manual-Test-Bench method have problems viz. time-consuming, manual errors and costlier. This paper describes the case-study to automate the regression-tests of this Control System using the Hardware-In-loop technique by replacing the manual actions of simulating the fault-conditions and performing the tests, which reduces the testing time, manual efforts and overall cost as compared to manual testing substantially. The hardware used to create the corresponding fault conditions in the developed Hardware-In-Loop automated-test-bench are Load-Box-User-Interface-System-(LUIS) and Digital-FMET-Box. And to automate the manual testing processes, the simulating tools used are NI-TestStand and LUIS-GUI. The developed automated-test-bench deliver faster test results with reduced manual efforts and errors while saving overall cost as compared to conventional manual-test-bench method.