Designing On-Board Diagnostics for Light and Medium Duty Emissions Control Systems
I.D. # C0707 Duration 3 Days

On-board diagnosis of engine and transmission systems has been mandated by government regulation for light and medium vehicles since the 1996 model year. The regulations specify many of the detailed features that on-board diagnostics must exhibit. In addition, the penalties for not meeting the requirements or providing in-field remedies can be very expensive. This course is designed to provide a fundamental understanding of how and why OBD systems function and the technical features that a diagnostic should have in order to ensure compliant and successful implementation.

Fundamental design objectives and features needed to achieve those objectives for generic on-board diagnostics will be covered. The course will also include a review of the California Air Resources OBD II regulation, providing students with a firm foundation for reading and understanding the requirements, including the in-use rate portion of the regulations and how to properly calculate and output the required rate information. Relationships between the regulation and various SAE and ISO recommended practices will be reviewed. The course will also explore the relationship of the OBD system with the underlying control system.

Note that because of proprietary considerations, this class does not provide details of algorithm design, algorithm performance, or algorithm application. The class will cover general OBD algorithm designs and the features required to promote sound OBD system design.

Learning Objectives
By attending this seminar, you will be able to:
  • Articulate the underlying design objectives of on-board diagnostic systems
  • Use the latest California Air Resources Board On-Board Diagnostic Regulation for Light and Medium Vehicles to find and apply OBD requirements
  • Apply the design features that all diagnostics need for successful implementation
  • Design diagnostics to comprehend variation
  • Successfully implement algorithms to track in-use rates in accordance with the CARB OBD II Regulation
  • Use SAE J1979 to implement generic scan tool support in diagnostic design
  • Implement OBD design requirements in control system design
Who Should Attend
This course is designed for engineers involved in either the design or control of on-board diagnostic systems for engines or transmissions for light and medium duty on-road vehicles. Individuals working in the heavy duty industry may also find the information interesting, but should note that the examples will be geared towards spark ignition engines and light and medium duty regulations. In addition, engineers involved in engine and transmission hardware will benefit by obtaining a better understanding of the design of OBD systems. Engineers new to the area of OBD system design and engineers involved in the design of control systems wishing to obtain a better understanding of OBD requirements will also find the course valuable.
An undergraduate engineering degree or a strong technical background is highly recommended. A basic knowledge of college algebra, college physics, and a familiarity with modern engine or transmission systems is required.
Seminar Content
  • Fundamental Design Objectives for OBD Systems
  • Basic Design Features for OBD Systems
  • Exercise: "Customers" and their OBD Requirements
  • Overview of the World Wide OBD Regulatory Structure
  • California Air Resources Board (CARB) Regulatory Process
  • How to use the CARB Light/Medium Regulation
    • Malfunction and diagnostic system requirements
    • Enforcement of malfunction and diagnostic system requirements
  • CARB Regulation - an in-depth look at:
    • In-use rates
    • Comprehensive component requirements
  • Introduction to a Diagnostic Design Process (Box, Graves, Bisgaard, Van Gilder, et al)
  • Defining "Good" vs. "Bad" Systems
  • Exercise: Defining Good vs. Defective Systems
  • Anatomy of an On-Board Diagnostic
  • Diagnostic Modeling
  • Exercise: Induction System Modeling
  • Understanding and Dealing with Variation
    • Decision making processes
    • Design guidelines for Exponentially Weighted Moving Averages (EWMA)
  • SAE J1979 - An Overview
  • Exercise: Finding Information in J1979
  • System Design for Diagnosibility
  • Overview of Regulatory Requirements Related to OBD
    • In-use Enforcement
    • Emissions warranty
  • OBD Certification Process
  • The Relationship between the Control and OBD System Design
Instructor(s): John Van Gilder
John Van Gilder is currently a Technical Fellow, OBD II Development, in the General Motors Powertrain Group where he is responsible for implementing statistical techniques in OBD design, model based on-board diagnostic design, development of OBD requirements for new powertrain systems, and in-use assessment of OBD systems. Prior to that, Mr. Van Gilder was a Product Assurance Engineer at Delphi where he focused on improving design and manufacturing process reliability, including implementation of quality tools such as design of experiments, quality function deployment, statistical process control, etc. for spark plugs and exhaust oxygen sensors. Mr. Van Gilder was also a Commissioned Officer in the United States Navy working in materials research and development. He has organized and presented at numerous SAE OBD and Powertrain Controls technical meetings. Mr. Van Gilder has a B.S.E. in Engineering Physics from the University of Michigan, a M.S. E. in Nuclear Engineering from the Bettis Atomic Power Laboratory and a M.S.E. in Reliability Engineering from Kettering University and is a Professional Engineer in the state of Michigan.
"Outstanding course. Recommended to anyone involved with emissions."
Homayoun Ahari
Diesel AT Tech Expert

Fees: $1745 SAE Members*: $1395 - $1575
* The appropriate SAE Member discount will be applied through the Registration process.  Discounts vary according to level of membership: Elite Member 20%; Premium Member 15%; Classic Member 10%