Browse Topic: On-board diagnostics (OBD)

Items (245)

Design of a Secure Automated Driving Systems Test Data Interface

2023-01-0828

04/11/2023

Vehicles equipped with Level 4 and 5 autonomy will need to be tested according to regulatory standards (or future revisions thereof) that vehicles with lower levels of autonomy are currently subject to. Today, dynamic Federal Motor Vehicle Safety Standards (FMVSS) tests are performed with human drivers and driving robots controlling the test vehicle’s steering wheel, throttle pedal, and brake pedal. However, many Level 4 and 5 vehicles will lack these traditional driver controls, so it will be impossible to control these vehicles using human drivers or traditional driving robots. Therefore, there is a need for an electronic interface that will allow engineers to send dynamic steering, speed, and brake commands to a vehicle. This paper describes the design and implementation of a market-ready Automated Driving Systems (ADS) Test Data Interface (TDI), a secure electronic control interface which aims to solve the challenges outlined above. The interface consists of a communication port

Zagorski, Scott, Nguyen, An, Heydinger, Gary, Abbey, Howard

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SAE-PP-0131805/09/2022

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SintzUSER, Jeneane

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SAE-PP-0131605/09/2022

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Rickard, Christopher, SintzUSER, Jeneane

ML Based Misfire Prognostics using Connected Vehicle Data

2022-01-049003/29/2022

For Spark-Ignition engine, misfire reduces gas mileage, increase emissions and even damages the engine. Thus, misfire monitor is required by California Air Resources Board (CARB)’s On-board diagnostics (OBD) II regulations. Misfire rates are determined based on the misfire counts, and the monitored event count. If misfire rates are above pre-set threshold under certain conditions, a misfire Diagnostic Trouble Code (DTC) will be set and remind the customer for repairing which increase OEM ‘s engine misfire warranty and cause customer satisfaction issue. The objective is to leverage connected vehicle (CV) data to detect potential misfire issue and fix it through calibration software update, thus reduce warranty and improve quality. An LSTM network enables us to input sequence data into a network, and make predictions based on the individual time steps of the sequence data. Moreover, it is capable of learning long-term dependencies which is a perfect fit for misfire feature. Thus, the

Wang, Zhe

Tooth Time-Based Engine Misfire Detection Index for Multicylinder Engines of Vehicles Not Affected by Various Deviations between Cylinders

03-15-03-002109/28/2021

This article proposes a new misfire detection index, the ΔGap slope, for a four-cylinder engine. However, the proposed index is not limited to four-cylinder engines. The ΔGap slope uses the tooth time measured using the existing crankshaft position sensor; therefore, an additional sensor is not required, which makes it economical. The ΔGap slope is defined as the difference between the gap slopes of the same cylinder for two adjacent cycles. Various factors that cause deviations in gap slopes between cylinders can be eliminated in the process of determining the difference between two gap slopes. Hence, in contrast with the existing engine roughness method, the ΔGap slope has the advantage of not requiring compensation for deviations between the cylinders. The conventional gap slope method must use different sets of thresholds for each cylinder located at the same position on the sensor wheel, which results in multiple thresholds being applied. In contrast, the ΔGap slope can use the

Han, Poonggyoo

Self Diagnostic cars using Infotainment ECU

2021-26-002709/22/2021

Nowadays the passenger vehicles are coming with complicated & Multiple ECU's and functions. So the complication in diagnosing a vehicle is increasing day by day. And even for a diagnostic technician it is very complicated to diagnose a vehicle without error description ( DTC - Diagnostic trouble code) and a proper tool from the manufacturer.In vehicles, currently when there is a fault, the MIL (malfunction indication lamp) will glow, indicating that something is wrong. So the user will not be able to find out if the car will stop after driving 100 m or 1 km. Even for a very simple faults ( DTC ), in critical ECU's ( like Engine control, ABS, EPS ), the vehicle cluster will show warning lamps like MIL which will make the driver/user panic. In this situation one need to connect with diagnostic tool in OBD port and read out through good diagnostic software. The idea is by making software in the Infotainment system to read and clear faults from critical ECU's like ABS, ECM & cluster, so

Kannadhasan, Amarnath

Application of Machine Learning Technique for Development of Indirect Tire Pressure Monitoring System

2021-26-001609/22/2021

Tire pressure has a significant impact over driving dynamics, fuel consumption as well as tire life therefore, continuous monitoring of tire pressure becomes imperative for ride comfort, safety and optimum vehicle handling. The two types of systems used for tire pressure monitoring are Direct and Indirect. Direct system deploys pressure sensors at each tire to directly measure pressure value, while indirect systems make use of signals from already existing sensors to predict pressure. Direct tire pressure measurement system will have higher accuracy, but it comes with an additional cost. The indirect system on the other hand demands mandatory ESP system and those based on wheel speed signals are less accurate compared to the direct system however, there is minimum cost addition. The paper presents a digital proof of concept study for indirect tire pressure monitoring system development for Non-ESP vehicles using machine learning technique. For this purpose, a full vehicle multi-physics

Sachan, Richa, Iqbal, Shoaib

Minimum Operational and Maintenance Responsibilities for Aircraft Tire Usage

ARP5265C (Current)

09/20/2021

This SAE Aerospace Recommended Practice (ARP) sets forth criteria for the installation, inflation, inspection, and maintenance of aircraft tires and the maintenance of the operating environment to ensure the safety of support personnel and the safe operation of the aircraft.

A-5C Aircraft Tires Committee

Minimum Operational and Maintenance Responsibilities for Aircraft Tire Usage

ARP5265C-TEST-REC (Historical)09/20/2021

A-5C Aircraft Tires Committee

C0708.Multi07/08/2021

On-board diagnostics, required by governmental regulations, provide a means for reducing harmful pollutants into the environment. Since being mandated in 1996, the regulations have continued to evolve and require engineers to design systems that meet strict guidelines. This one day seminar is designed to provide an overview of the fundamental design objectives and the features needed to achieve those objectives for generic on-board diagnostics. The basic structure of an on-board diagnostic will be described along with the system definitions needed for successful implementation. Please 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. Individuals desiring a more in-depth look at On-Board Diagnostics should consider attending SAE seminar ID# C0707 Designing On-Board

Catalog of Landing Gear Systems and Suppliers

AIR5631A (Current)02/03/2021

The purpose of this document is to provide a listing for current commercial and military aircraft landing gear systems and their types and manufacturers. Data has been provided for the following commercial aircraft types; wide body jet airliners, narrow body jet airliners, and turboprop/commuter aircraft and the following military aircraft types; fighter, bomber, cargo, attack, surveillance, tanker and helicopter categories. The aircraft that have been included in this document are in operational service either with airlines, business, cargo or military operators. No information is presented for aircraft that are currently being developed or that are not in extensive usage. This document will provide an informational reference for landing gear engineers to access when evaluating other gear and aircraft systems. Future revisions of this document will add aircraft as they enter into service.

A-5 Aerospace Landing Gear Systems Committee

“Rds_on” Based OBD for Pre-Supply Fuel Pump Driver Modules

SAE-PP-0016001/26/2021

In automotive electronics on-board diagnostics does the fault diagnosis and reporting. It provides the level of robustness required for the control electronics against various faults. The amount of diagnostic information available via on board diagnostics are depends on the type of vehicle. Pre-supply fuel pump is the component in the common rail hydraulic system. It pumps the fuel from the fuel tank to the inlet valve of the high pressure fuel pump. Electronic control unit synchronizes its operation with high pressure fuel pump. A dedicated driver module in the ECU controls the operation of pre-supply fuel pump. The driver module consist of an ASIC with internal voltage, current monitoring modules for the fault diagnosis and the pre-drivers to control external HS and LS power stages. The software part of the OBD programmed in the internal memory of the ASIC. The “Rds_on” of the power MOSFETs are used for the fault detection purpose. The module designed to operate in dual frequencies

MobrxivNonAdmin, Lindsay

Tire pressure's impact on EV driving range

20AUTP11_0311/01/2020

A new study shows that tighter control of tire-pressure loss can lead to marked improvement in electric-vehicle efficiency. Electric-vehicle development teams have made great advances in improving vehicle range, mitigating “range anxiety” for the end customer. While much focus has been on advances in battery technology, controls and vehicle aerodynamics, EV driving range also is significantly affected by tires. Energy-inefficient tire construction, sub-optimal inflation and other factors can adversely impact EV range. Tires lose a certain amount of air on a continuous basis. An underinflated tire is less stiff and its deformation is much higher, leading to a larger amount of heat dissipation and ultimately higher rolling resistance and poor range efficiency.

Tang, Lamei, Wei, Sheng, Valentage, Jeffrey, Li, Zheng, Nair, Sujith

Softing envisions secure, reliable predictive maintenance

20TOFHP08_0508/01/2020

Modern heavy-duty vehicles, such as trucks and buses but also forestry and agricultural machines or construction equipment, are packed with E/E components that support self-diagnostic functions and increase the quality of maintenance, service, and repair processes. In service workshops, “right the first try” reduces expensive downtime and saves a lot of money. This objective is supported by a process that captures the already generated in-vehicle data and sends it to a cloud server for analysis and the creation of vehicle- and/or fleet-specific predictive maintenance sequences. The sequences support the service technician in the predictive maintenance process.

Subke, Peter

Softing envisions secure, reliable predictive maintenance

SAE-MA-0443607/13/2020

As heavy-duty vehicles become increasingly automated, on-board diagnostics, condition monitoring and predictive maintenance become even more vital.

Subke, Peter

Marine Stern Drive and Inboard Spark-Ignition Engine On-Board Diagnostics Implementation Guide

J1939-5_202006 (Current)

06/30/2020

This document describes the application of the SAE J1939 recommended practices for compliance with on-board diagnostic malfunction detection system requirements for marine sterndrive and inboard spark ignition engines, as mandated by the California Air Resources Board (CARB). These Otto-cycle engines are not derived from automotive diesel-cycle engines.

Truck Bus Control and Communications Network Committee