Text preview for : manual-5989-1682EN.pdf part of Agilent manual-5989-1682EN Agilent HP N6700 Series Product Reference CD manual-5989-1682EN.pdf
Back to : manual-5989-1682EN.pdf | Home
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