HEM Data discusses the DAWN OBD and J1939 Mini Logger


HEM Data provided information on the DAWN OBD and J1939 Mini Logger at WTS17.  It is a compact, robust, data logger designed to acquire CAN data from trucks, buses, cars, and off-road vehicles. Options that fit within the logger include GPS, a tri-axial accelerometer, and either WiFi or GSM cellular. The logger acquires all of the in-vehicle network CAN parameters or a user-defined subset.

The logger installs within a minute by simply inserting it directly onto the J1939 or J1962 (OBD-II) connector. The logger is so small that it fits in the palm of your hand.

Applications include fuel economy, idle time, driver behavior, intermittent problems, engine hours, miles driven, diagnostic trouble codes (DTCs), PTO usage, fuel theft, estimating emissions, road grade, and vehicle weight. The Mini Logger aids in product development, service, and fleet management. The optional web-based DAWN Dashboard summarizes fleet data and sends alerts when important conditions occur.

The companion DawnEdit™ software determines which parameters are available on the vehicle to create a unique database for each vehicle model. The user selects the desired parameters and sample rate. Also, the user can add custom messages and import DBC files to acquire proprietary parameters.

The logger can acquire from three CAN networks simultaneously. It acquires PIDs, PGNs, Normal CAN custom messages, and enhanced OBD (EOBD/service) data. J1939 vehicle networks usually have all desired parameters available; however, light-duty and many medium-duty vehicles don’t use the J1939 standard. To address this limitation, HEM Data offers OEM specific EOBD databases. Optional EOBD databases include Ford, Chrysler, Toyota, Nissan, Mercedes, GM, Honda, Hyundai, Kia, and Mazda.

HEM Data offers Mini ADAQTM (analog-to-CAN) modules for applications requiring your own sensors. Besides sensor inputs, the ADAQ modules accept a variety of temperature (type J, K, T thermocouples & thermistor), digital, frequency, PWM, current and inclination inputs. The Mini Logger stores data generated by the ADAQ and can transfer data via cellular or WiFi to a website, PC or mobile application. All data from the ADAQ, CAN network and GPS are combined into a single CSV file.

Products are in stock. HEM Data sells and supports its products from its US office in Southfield, Michigan.

HEM Data also announced it has written a book entitled Data Acquisition from HD Vehicles Using J1939 CAN Bus. It is published by SAE and is available from both SAE and HEM Data directly.

This book compares various diagnostic approaches including OBD-II, HD-OBD and World Wide Harmonized (WWH) OBD. In-vehicle network data is valuable for improved maintenance, vehicle and subsystems performance, fleet management, warranty and legal issues, reliability, durability, and accident reconstruction. Applications discussed include calculating fuel economy, duty cycle analysis, and capturing intermittent faults.

The focus of the book is how to acquire and correctly interpret data from the in-vehicle network of heavy-duty (HD) vehicles using the SAE J1939 standard. The book presents an introduction to CAN, the building block of J1939, and guides the reader through various SAE J1939 standards.

The reader will learn how to determine the available parameters on HD vehicles including their accuracy and sample rates, and how to acquire and convert messages to scaled engineering parameters. Data Acquisition from HD Vehicles Using J1939 CAN Bus is a must-have reference for those interested in getting started with SAE J1939 as well as experienced testers who want to use in-vehicle data more effectively.

For more information, visit hemdata.com.