Overview

The CDM-300 Series Automotive Chassis Dynamometer is designed in accordance with the requirements of the two-idle speed test method, steady-state test method, and simple transient test method specified in GB18285-2018 "Limits and Measurement Methods for Exhaust Pollutants of Gasoline Vehicles (Two-Idle Speed and Simple Load Mode)", and meets the technical requirements for dynamometers specified in GB3847-2018 "Limits and Measurement Methods for Exhaust Pollutants of Diesel Vehicles". It is suitable for simple load mode (steady-state and simple transient) tests on in-use gasoline vehicles with a maximum total mass not exceeding 3500kg and a maximum design speed of no less than 100km/h, and satisfies the loaded deceleration mode inspection for diesel vehicles with a maximum total mass not exceeding 3500kg.

The specially designed dual-shaft chassis dynamometer meets the requirements of simple load mode automotive emission testing for single-axis drive and four-wheel drive vehicles (front-wheel drive, intelligent four-wheel drive, and full-time four-wheel drive vehicle testing).

The four-wheel drive dynamometer is equipped with a wheelbase adjustment mechanism, a front-rear axle synchronization mechanism, and an inertia automatic matching mechanism, providing an integrated solution for two-wheel drive, four-wheel drive models, and variable wheelbases.

Technical Features

• Meets the requirements of Appendices B and D of GB18285-2018, and provides an integrated solution for two-wheel drive, four-wheel drive models, and variable wheelbases.

• One air-cooled eddy current machine is configured for each of the front and rear axles.

• Ensures the synchronization of front and rear wheels, adaptive wheelbase adjustment, and automatic distribution of front and rear axle drive loads.

• Precision-manufactured pneumatic clutch mechanism realizes synchronous or step-by-step operation of the front and rear axles, ensuring that the basic inertia of the dynamometer during dual-axis detection is (900±18kg).

• Precision-machined balanced rollers, the surface of the rollers is specially knurled and then sprayed with a tungsten carbide wear-resistant layer.

• High-quality imported lifting mechanism airbags and SMC pneumatic components.

• High-precision 2000P/r speed encoder ensures high performance and high reliability.

• Built-in two sets of Siemens anti-drag motors for system loss measurement, preheating, and coasting tests, controlled by two imported frequency converters, with system inertia testing, regular system loss testing, and load coasting calibration functions.

• The four-wheel drive dynamometer is equipped with a mechanical overload protection device to protect the equipment under unexpected conditions.

• The front axle dynamometer is equipped with front blocking rollers to prevent the vehicle from rushing out of the test bench, and the front axle dynamometer is equipped with left and right blocking mechanisms with adjustable distance.

• Equipped with an exhaust extraction device that can be linked with the wheelbase.

• To ensure the test control accuracy and response time required by GB18285, the core control of the dynamometer adopts an independent core controller, and the core control and data acquisition unit adopt the latest ARM embedded computer technology.

• The independent core controller unit accurately and in real time controls the dynamometer in various modes (constant speed, constant force, constant power, maximum power dynamic scanning, load coasting).

• The test system meets the requirements of MES system networking and the new vehicle data reporting function required by GB18285-2018.

Functions

• Emission dynamometer load simulation functions: steady-state load simulation, simple transient load simulation.

• Basic inertia test function of the emission dynamometer.

• Internal power loss test of the emission dynamometer.

• Coasting calibration test functions of the emission dynamometer (constant load coasting, variable load coasting).

• Force calibration function of the emission dynamometer.

• Speed calibration function of the emission dynamometer.

Accuracy

3. Electrical Control System

Reference Pictures of Control Cabinet Appearance