Off-road vehicle performance testing mainly includes the following aspects:
Power performance testing: The output power of the vehicle drive wheel is tested by a chassis dynamometer. The qualified condition is ηVM ≥ηMa or ηVp ≥ηPa, where ηVM and ηVp are obtained by chassis dynamometer test, and ηMa and ηPa are found by relevant tables. In addition, the power performance can also be evaluated by checking the vehicle speed and acceleration ability, such as performing an acceleration test on a flat and straight road to observe the maximum vehicle speed and acceleration response.
Four-wheel drive system testing: The type and performance of the four-wheel drive system are crucial. Common four-wheel drive systems include part-time four-wheel drive, full-time four-wheel drive and timely four-wheel drive. Part-time four-wheel drive is suitable for experienced drivers to use under specific road conditions; full-time four-wheel drive always maintains four-wheel drive, providing better stability and traction; timely four-wheel drive can automatically switch between two-wheel drive and four-wheel drive according to road conditions.
Ground clearance detection: Ground clearance refers to the distance between the lowest point of the vehicle chassis and the ground. The higher the ground clearance, the less likely the vehicle will hit the bottom when passing through obstacles such as potholes and stones. Approach angle, departure angle and breakover angle detection: The larger these angles are, the less likely the vehicle will collide when climbing, descending and crossing obstacles. The approach angle is the angle between the tangent line from the lower front end of the vehicle to the front wheel and the ground; the departure angle is the angle between the tangent line from the lower rear end of the vehicle to the rear wheel and the ground; the breakover angle is the angle between the lowest point between the front and rear wheels in the middle of the bottom of the vehicle and the tangent line between the front and rear wheels and the ground. Suspension system detection: A high-quality suspension system can absorb vibrations, keep the wheels in contact with the ground, and improve handling and passability. Independent suspension may have more advantages in comfort and handling, while integral bridge suspension performs well in strength and load-bearing capacity. Wading depth detection: For off-road scenes that require crossing rivers and puddles, a larger wading depth is necessary. Tire detection: Off-road tires usually have deeper treads and stronger grip, providing better traction and braking performance on muddy, gravel and other roads.
Torque detection: Strong power output and sufficient torque are essential for overcoming steep slopes, towing heavy objects, etc.
