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Dual Cultch Transmission (DCT) system has advantage both manual transmission and automatic transmission. As requirement of developing the DCT system is increasing, it is getting important to implement efficient On-Board Diagnosis (OBD) logic system to detect malfunction in vehicle to satisfy California Code Regulation (CCR 1968.2). To satisfy the CCR 1968.2, monitoring for circuit continuity and circuit faults shall be conducted continuously to detect Short to Circuit Ground (SCG), short to Circuit Battery (SCB) and Open error. In this paper, diagnostic logic for two clutches (clutch 1 and 2) and select, shift motor will be introduced to implement Transmission Control Unit (TCU) in DCT system. There are two methods to detect motor u/v/w-lines error. One is by using Application Specific Integrated Circuit (ASIC) diagnosis result and the other one is by software algorithm.

This paper presents newly developed road resistance coefficient estimation control logic with G-sen(Gravity sensor) that is designed to optimize the gear shifting point for automatic transmission. The system consists of PCU(Power train Control Unit) which is controlling engine and transmission, and G-sen which possible to measure the real time road slope. Using longitudinal vehicle dynamic modeling with model based method; it is possible to estimate the real time road resistance coefficient and vehicle mass