bodycontrolmodules-資料下載頁(yè)
【導(dǎo)讀】Copyright©2020Delmar,CengageLearning. BodyControl. Modules. InstructorName:(YourName). 13. CHAPTER. Copyright©2020Delmar,CengageLearning. LearningObjectives. Copyright©2020Delmar,CengageLearning. LearningObjectives(continued). Freightliner®SmartPlex?multiplexed. electricalsystems. operates. Copyright©2020Delmar,CengageLearning. ElectricalSystem. electricalsystem. controller(ESC). bodycontroller. Copyright©2020Delmar,CengageLearning. InternationalESC. Copyright©2020Delmar,CengageLearning. Figure13-2. International. bodycontroller.Copyright©2020Delmar,CengageLearning. Copyright©2020Delmar,CengageLearning. TechTip. outputs.Copyright©2020Delmar,CengageLearning. HornCircuit. Copyright©2020Delmar,CengageLearning. typesofoutputs:. –Highsidedrivers. –Lowsidedrivers. Copyright©2020Delmar,CengageLearning. HighSideDriver. continuously. Copyright©2020Delmar,CengageLearning. Copyright©2020Delmar,CengageLearning. LowSideDrivers. smallsolenoids. Copyright©2020Delmar,CengageLearning. datalink
【正文】 outputs. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? Outputs of the body controller include high side drivers, low side drivers, and messages on the J1939 data link. ? Input sources for the body controller include messages from the J1939 data link, messages from the switch link, and hardwired inputs such as switches and sensors. ? A reference ground scheme is monly used in automotive electronics to minimize the effects of electromagic interference and to improve measurement accuracy for sensor circuits. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? A diagnosable switch is a special switch that provides specific values of resistance, unlike a conventional switch, which is either an open circuit or a near 0?. A diagnosable switch is connected to an analog input. This permits circuit failures such as an open circuit or a shortedtoground circuit to be diagnosed. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? The body controller controls several electrical system features, including headlamps, turn signals, stop lamps, and windshield wipers. The various switches act as inputs to the body controller through either hardwiring or multiplexing. The body controller microprocessor makes decisions based on its programming and provides an output in the form of energizing a high side driver, energizing low side driver, or transmitting a data link message. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? Selfdiagnostics assists in troubleshooting the body controller. Diagnostic trouble codes may be logged to indicate a circuit that is out of range high or out of range low. ? The Freightliner SmartPlexTM system uses two or more separate modules to control body electrical features. The bulkhead module (BHM) controls the chassis module (CHM) via the J1939 data link. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? The Freightliner SmartPlexTM uses optional smart switches to control electrical system features. Each smart switch contains two identification resistors that uniquely define the switch function. ? The instrument cluster in the Freightliner SmartPlexTM system is called the ICU. The ICU acts as the input device for the stalk mounted multifunction switch. The ICU transmits the status of the multifunction switch inputs on the J1939 data link. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? Diagnostic trouble codes (DTCs) are used to indicate that an electrical module has detected and abnormal condition. DTCs may indicate a sensor inrange operating condition, such as engine coolant temperature is too high. DTCs may also indicate sensor out of range conditions, such as open circuits or shorts to grounds. A J1939 DTC consists of an SPN and FMI. Copyright 169。 2020 Delmar, Cengage Learning Summary(continued) ? Ghost voltage describes an open circuit measurement of a voltage by a DMM in a circuit with high resistance. Ghost voltage can result in misdiagnosis.
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