How Does a Four-Wheel Drive Vehicle Go Through the Inspection Line?
1 Answers
Four-wheel drive vehicles undergo the same annual inspection as two-wheel drive vehicles, with the only difference being in the exhaust emission testing. For four-wheel drive vehicles, exhaust testing can only be conducted using the idle condition method, unlike two-wheel drive vehicles which can use the simulated driving condition method. This is because the different rotational speeds of the front and rear wheels in four-wheel drive vehicles would result in varying exhaust emissions. Below is some information about four-wheel drive: 1. Four-wheel drive refers to a vehicle that maintains all four wheels driving throughout the entire journey, with the engine's output torque distributed to the front and rear wheels in a fixed ratio. This driving mode ensures excellent off-road and handling performance at all times. 2. Part-time four-wheel drive is a system where the driver can manually switch between two-wheel drive and four-wheel drive. By engaging or disengaging the transfer case based on driving needs, the driver can achieve either two-wheel or four-wheel drive. This is the most common four-wheel drive system found in off-road vehicles or SUVs with four-wheel drive capabilities. 3. On-demand four-wheel drive is a system that only activates four-wheel drive when necessary, otherwise remaining in two-wheel drive. This not only reduces the cost of manufacturing four-wheel drive vehicles but also provides users with better fuel economy. 4. Full-time four-wheel drive means that all wheels are independently driven at all times during vehicle operation.
