Agilent manual-5989-1682EN free download

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Increase Automotive ECU Test Throughput Application Note 1505 Description DC Power Input Communication Interface The automobile electrical VBattery CAN bus system is poorly regulated and subject to frequent dips and Static Analog Inputs Static Digital Drive Ouputs overshoots. Voltage can range VBattery sense Fuel pump from 11 to 15 volts under Engine temperature Check engine light normal conditions and from Air temperature A/C cutout relay 8 to 24 volts under transient Manifold Absolute Pressure (MAP) Fan relay starting and running conditions. Mass air flow rate EGR solenoid As a result, voltage margin testing is a necessary part of Exhaust oxygen (Lambda) Purge canister solenoid testing Engine Control Units Throttle position Diagnostics code readout (ECUs) to verify proper opera- Dynamic Analog Inputs Dynamic Digital Driver Outputs tion and tolerance for extreme Engine knock Fuel injectors bias voltage conditions. Ignition coils Problem Static Digital (or Switched) Inputs Static Analog Outputs Every second of test time counts Ignition switch: off, acc., on, crank Regulated voltages or currents for sensors in the competitive automotive Acc. on/off; A/C, heater, brake, lights electronics marketplace. Testing Throttle idle position at multiple bias voltage levels is Diagnostic mode a necessary, but time consuming part of ECU testing. Most system Dynamic Digital (or Pulsed) Inputs Dynamic Analog Outputs DC sources available require Vehicle speed Idle speed control servo significant time to change and Camshaft/engine speed settle to a new output setting, Camshaft/engine position adding several seconds to the overall test time. Figure 1. ECU Inputs and Outputs Solution Agilent Technologies N6700