TOD is the abbreviation Torque-On-Demand, meaning “torque-demand four-wheel drive” technology, it can allocate the power required according to road conditions and vehicle. Under normal conditions, TOD rear-wheel drive system is primarily, but road conditions change, it will be necessary, the torque transmitted to the front wheels to provide sufficient grip.
1.TOD describes four-wheel drive system
TOD is the abbreviation Torque-On-Demand, meaning “torque-demand four-wheel drive” technology, which may need to assign the vehicle and road conditions power. Under normal conditions, TOD rear-wheel drive system is primarily, but road conditions change, it will be necessary, the torque transmitted to the front wheels to provide sufficient grip.
Basic introduction
2.TOD four-wheel drive system
The system Borg Warner to begin production in 1994, it has been equipped with a variety of models, while Harvard is the earlier domestic models equipped with the system . The following will Haval H5 equipment TOD introduce four-wheel drive system as an example.
TOD means of a plurality of sensors to detect the operating status of each axle of the detected vehicle parameters, axle rotation speed, throttle opening, and ABS brake system status, in order to prevent loss of adhesion of the tire. TOD device is installed at a front end position of the drive shaft of the vehicle, controlled by the electronic control unit ECU. Is determined by the electronic control unit according to the running condition of the vehicle front wheel skid, to provide adequate current to the electromagnetic coil, the first stage of the driving cam plate clutch mechanism, a second compression stage wet clutch which bound it, whereby the torque of the rear axle assigned to the front axle. When the current wheel slip badly, i.e., front and rear wheels when the rotational speed difference becomes large, the ECU by increasing current, so that the torque amplifier further pressing the multiple disc clutch, so more torque distribution to the front axle.
Compared with the conventional fluid coupling, such as timely four-wheel drive technology, TOD can acquire an engine speed signal, a wheel speed signal and other signals by a sensor mounted on the vehicle by the analysis and calculation, to actively adjust, reasonable distribution torque, thereby improving the vehicle behavior, significantly shorter than the response time of the hydrodynamic coupling. In addition to the fluid coupling is quite sensitive to temperature, and does not start TOD delay at low temperatures. In addition, TOD system with ABS, ESP, TCS matching system, is compatible with (for example, when the ABS work, TOD system will cut off the power at the front wheels within 60ms, for better braking effect), will help improve the active safety of the vehicle.