Automotive Test Solutions / 29-01-2014


January 29 2014

 

IT'S TIME TO MEET AGILENT TECHNOLOGIES' AUTOMOTIVE TEST SOLUTIONS

Dear Madam/Sir 

    If you are designing, manufacturing and testing automotive electronics, you face a lot of pressure. Most likely, you need to meet aggressive time-to-market goals. At the same time, you're juggling demands for higher quality, faster throughput and lower costs. We understand, and welcome the opportunity to help you develop and test your electronic products faster and within cost targets,  while meeting your quality goals. We offer a broad set of robust test tools -  the broadest offering in the automotive electronics test industry - to help you.

İsmail Cem ATAR

Technical Marketing Engineer

i.cem_atar@sparkmeasure.com

 

 

1-Automotive Debugging LIN, CAN, and FlexRay Serial Buses

Oscilloscopes in Automotive

To help you accelerate debug of your automotive serial  buses, Agilent's InfiniiVision 2000, 30

00, and 4000  X-Series provide CAN and LIN triggering and decoding  as well as CAN eye-diagram mask testing capability.  The InfiniiVision 3000 and 4000 X-Series also provide  FlexRay triggering and decoding as well as FlexRay  eye-diagram mask testing capability.

 

To improve efficiency of system communication and to reduce  cost, all of today's automotive designs employ a variety of serial  bus communication protocols. The I2C and SPI protocols are  most often used for chip-to-chip communication within electronic  control units (ECUs). For longer distant serial communication and  control between various automotive subsystems such as comfort  control systems, anti-lock brakes, drive train, and engine control,  the CAN, LIN, and FlexRay protocols are the most popular serial  buses implemented in today's vehicles.

For more info please click on link:Oscilloscopes in Automotive

2-Increase Automotive Engine Control Units(ECU) Test Throughput

The automobile electrical system is poorly regulated and subject to frequent dips and overshoots. Voltage can range from 11 to 15 volts under normal conditions and from 8 to 24 volts under transient starting and running conditions. As a result, voltage margin testing is a necessary part of testing Engine Control Units (ECUs) to verify proper operation and tolerance for extreme bias voltage conditions. 

 Problem

 regulated and subject to frequent dips and overshoots. Voltage can range from 11 to 15 volts under normal conditions and from 8 to 24 volts under transient starting and running conditions. As a result, voltage margin testing is a necessary part of testing Engine Control Units (ECUs) to verify proper operation and tolerance for extreme bias voltage conditions.

Every second of test time counts in the competitive automotive electronics marketplace. Testing at multiple bias voltage levels is a necessary, but time consuming part of ECU testing. Most system DC sources available require significant time to change and settle to a new output setting, adding several seconds to the overall test time.

 Solution

Agilent Technologies N6700 Modular Power System and N6752A power supply module incorporate features that reduce ECU test time and enhance testing, including:

* The N6752A 50 V, 10 A, 100 W autoranging power supply module features active down programming for fast output downward transitions regardless of load.

* Less than 1 millisecond command processing time reduces test time.

* Less than 4 milliseconds output response time reduces test time.

* Identical modules can be paralleled and operated as a virtual single output for greater output current and power, for testing higher power ECUs.

* Up to four modules fit in the 1-U high mainframe, saving test system space.

For more info please click on link: ECU Test Throughput

3-Automotive Engine Control Units (ECU) Transient Testing Using Captured Power System Waveforms

Description

Automotive vehicle power systems are very harsh electrical environments. High current motors, solenoids  and other components on the power system cause power system voltage transients and dropouts to occur often. Successful operation of your automotive electronics depends on adequate power transient immunity, and the mission critical nature of automotive electronics make thorough ECU testing a must. A variety of test standards such as ISO-7637 and ISO-16750 document transient waveform profi les to help you in that effort. But those waveforms represent a best guess at what your ECU will see in the vehicle. This application note describes methods to help you verify your ECU operation in the harsh vehicle power system environment by actually capturing the voltage transients as they occur in the vehicle, and playing back at a later time at your convenience to test your ECU.

Problem

Standard test methods and voltage profiles for automotive power system testing provide a good basis for ECU test. However they may not adequately reflect the actual transients that your ECU will see in the vehicle. Each ECU placement in the vehicle is unique and power system transients present may differ depending on the ECU location. High current motors or solenoids may be placed on the same power branch or proximity as your ECU and alternator and battery performance varies with environmental conditions. As such, the standard profiles used for power system transient testing are not totally representative of the transients that your ECU will experience. The ultimate test is to actually test the ECU in the vehicle itself under all operating conditions. But unfortunately this is not very practical.

Solution

What if you can record the transients which occur in the vehicle and play them back in your development lab when needed? Capturing the transients can be done by simply using an oscilloscope. Connect your oscilloscope to the power system where your ECU will be located and then exercise conditions known for generating transients while capturing the transients. Conditions such as engine cranking, compressor activation and cold temperature operation can be exercised, and the resulting power system transients captured. Once the transients have been captured, load them onto your PC for inspection, modify if needed and download to an arbitrary waveform generator (arb). Playback the output waveform via the arb connected to the ECU via a wide-band power amplifier. This approach can provide excellent insight into how your ECU will perform in the vehicle, and can be repeated multiple times as various ECU prototype revisions are developed. Multiple transient scenarios can be saved and a complete library created to use as needed. The transients can even be run for extended times such as overnight to test for intermittent susceptibility.

For more info please click on link: Automotive ECU Transient Testing

4-Small Engine Dynamometer Testing

Measuring Engine Performance with Agilent USB DAQ Modules

Testing of engine performance is often important in the development of engine and fuel technologies.Many parameters affect an engine's performance: the basic engine design, compression ratio, valve timing, ignition timing, fuel, lubricant, and temperature. The most critical factor governing an engine's power, fuel consumption and emissions is the amount of fuel consumed relative to the amount of air ingested. This is expressed as the air/fuel ratio; that is, the mass of air used divided by the mass of fuel burned. Larger engines typically have computer-controlled fuel injection governing the air/fuel ratio while smaller engines still use carburetors for controlling the air/fuel ratio. Proper tuning of an engine's carburetor requires careful measurements of torque, speed, temperature, and fuel consumption as a function of throttle position. Agilent USB data acquisition (DAQ) modules provide an inexpensive, fl exible solution for engine testing. To test engine performance in the laboratory, the engine is coupled to a dynamometer, which may be either an engine dynamometer (connected directly to the engine output shaft) or a chassis dynamometer (connected to the drive wheels). The dynamometer, which provides a load to the engine, can be easily controlled to allow testing under a wide range of speeds and torque.

The Measurement System

Given the volume of data and the number of real-time calculations required, a computer-controlled dataacquisition (DAQ) system is generally used tocalculate, display, and archive test data from tests. Agilent DAQ modules devices such as the U2355A multifunction DAQ module and U2802A 31-channel thermocouple input module are good examples. When used together, these devices are especially helpful in engine testing that requires measurements ofspeed, torque, throttle position, and temperature of cylinder and exhaust.

For more info please click on link: Measuring Engine Performance with Agilent USB DAQ Modules

5-Using Agilent 6690A Series System DC Power Supplies for Automobile Battery Simulation

42 V is becoming standard  voltage for the battery. However, because of load changes during the operation of the vehicle, that voltage may reach up to 60 V or go as low as 25 V. The new 42 V battery will have different requirements for duty cycle and total power capability than the 12 V battery. Under the start/stop scenario of the future vehicles, the number of starts and stops that the battery willendure could increase by a factor of more than 10.This loading puts more strain on the battery and other components used in the car.The Agilent 6692A power supply is ideal for simulating thebattery under all loading conditions. This power supply can alsobe used to test electronic equipment while simulating actual battery voltage fluctuations.

For more info please click on link: Power Supplies for Automobile Battery Simulation

6-N6467A BroadR-Reach Automotive Ethernet Electrical Compliance

N6467A BroadR-Reach Compliance ApplicationThe Agilent Technologies N6467A BroadR-Reach automotive electrical performance validation

 and conformance software for Infiniium oscilloscopes provides you with an easy and accurate way to verify and debug your BroadR-Reach automotive Ethernet designs. The Ethernet electrical test software lets you automatically execute Ethernet physical-layer (PHY) electrical tests and displays the results in a flexible report format. In addition to the measurement data, the report provides a margin analysis that shows how closely your device passed or failed each test.

 

To make BroadR-Reach automotive Ethernet measurements with the N6467A Ethernet electrical test software.

For more info please click on link: BroadR-Reach Automotive Ethernet Electrical Compliance

 7-DC to DC Converter Test with Advanced Power System

 Notes on DC to DC converter test

*Efficiency measurements: For testing high efficiency DC to DC converters, APS power supplies provide high accuracy volt, current, power, amp hour, and watt hour measurements built-in to provide precise efficiency calculations during test

*Simulating power transients: In this application space simulating voltage dropouts, sags, and surges is a common need in test. Also testing carryover time is a common test. Carryover time is tested by momentarily disrupting the input power to the DC to DC converter and seeing if it can still maintain its output power. To perform this test negative voltage pulse is created and the pulse width slowly raised until the output of the converter goes out of spec. The APS N7900 series has arb waveform capability to support this test need

*Bidirectional DC to DC converters: Instead of having an input side and output side with current flowing in one direction, bidirectional DC to DC converters allow current to flow in either direction so each input is also an output. These are used in power storage applications, such as how a battery needs to be charged and discharged (current flowing in both directions) 

8-The Automotive electronics application area encompasses a wide range of different types of DUTs found throughout the vehicle including:

  • Infotainment and telematics
  • Regenerative braking
  • High power ECUs Current trends in this industry include increased information via wireless connectivity and sensors, Engine turn-on / turn-off at stops, increased fuel mileage. These trends call for power test needs such as dynamic current measurements and engine crank profile waveform generation.

 How the Agilent Advanced Power Systems(APS) Helps Overcome the Test Challenge

  • Fast output speed, list mode, fast command processing speed
  • Current digitizer, seamless ranging, adjustable sample rate, elogging
  • AWG and step function capabilities, high output bandwidth mode
  • Provides continuous two quadrant operation (down programming)
  • V and I digitizers, pre and post triggering, large measurement range
  • Excellent transient response, high bandwidth output mode

9-MOST Compliance Application for Infiniium Oscilloscopes

Quickly validate compliance to MOST technology standards.

Need to validate physical layer compliance to MOST technology standards? Agilent's MOST compliance application will help you do this quickly and easily  without having to be an expert. The application runs on current Agilent Infiniium oscillos copes. Unlike other  vendors, who require additional jitter (EZJIT+) or serial data analysis (SDA)  software to be purchased separately for MOST testing, Agilent's MOST  compliance application embeds all jitter and serial data analysis capability  needed for testing MOST devices, which provides lower pricing.

The application automates the process, loading the proper setup files; analyzing  the measured results by comparing them to limits published in the specification;  and report generation including margin analysis of each test so you can see  precisely by how much each of your devices passed or failed each test.

For more info please click on link: MOST Compliance Application for Infiniium Oscilloscopes

   

info@sparkmeasure.com

Tel: 0 (312) 466 82 12

www.sparkmeasure.com

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