1. the TCS traction control system
traction control system (the TCS), which is the English name Traction Control System, i.e. tracking control system, a number of revolutions of the revolution speed of the drive wheels and the drive wheel determining whether or not the driving wheel slip occurs, when the former is larger than the latter, and thus inhibit one driving wheel slip control system speed. When braking automobile slippery surfaces, the wheels will slip, so that even the loss of directional control. Similarly, the car started or when hard acceleration, wheel slip is also possible, on slippery surfaces such as ice and snow also make the direction of out of control out of danger.
Introduction:
TCS is designed for this problem. TCS rely on electronic sensors detect when the driven wheel speed. TCS traction control system
of the drive wheel below (which is slippery characteristic), it will send a signal to adjust ignition timing, reducing the valve opening, the throttle is reduced, the wheel brake or downshift, so that wheel will not spin.
Properties:
TCS cars not only can improve the stability, but also improve acceleration performance, improved climbing ability. Former mining just before installing TCS on luxury cars, now common on many cars, too. TCS and ABS if used in conjunction with each other, will further enhance the safety performance of vehicles. ABS and TCS may be a common axle wheel speed sensor, and is connected to the trip computer continuously monitors the wheel speed, a low speed when the slippage found, TCS will immediately notify the ABS operation to reduce the slip of this wheel. If found at high slip, the TCS gives an instruction to immediately trip computer, engine deceleration command or downshift the transmission, so that the spinning wheel will not spin, drift out of control to prevent the vehicle.
The mode of action:
TCS mode of action very similar to ABS, the use of both sensor and brake regulator. When TCS sensesWhen wheel slip, engine control computer will first go through change of engine ignition time, reduce engine torque output or applying the brakes to prevent the wheels from slipping on the wheel, if the slip in a very serious situation, would no longer control the engine oil system. TCS in the use of time, the transmission will maintain a higher gear, the throttle when aggravated, avoid sudden stop to avoid slipping even more. TCS biggest feature is the use of the existing ABS system computer, sensing the output speed and engine and transmission control computer, even if put on the spare tire, TCS can be accurately applied.
How it works:
recently adopted traction control system more and more cars. The role of traction control system (Traction Control System, referred to as TCS) is the car can get the best traction in all driving conditions. Car in motion, the driving force required to accelerate, turn require lateral forces. These two forces are derived from tire friction on the ground, but the tires have a maximum friction on the ground. On a smooth road surface friction coefficient is small, and the driving force of the car are very small lateral force. If in order to obtain a large driving force, a tightly kept on the accelerator pedal depression, the driving force exceeds the maximum frictional force between the tire and the ground i.e. adhesion, so that not only can not achieve the desired driving force, but affected the car driving stability. Car when cornering, if the throttle opening is too large, it will cause wheel slip. So then turned the car will be what changes happen? Front-wheel drive vehicles if the front wheels slip, the car will understeer phenomenon appears that the car deviated from the turning arc, went beyond the arc turned to go. If the rear-wheel drive cars rear wheel skid, the car will oversteer phenomenon appears that the car deviated from the steering arc, went inside the arc of the turn to go, the car will have severe rotation. So on a snowy road, in order to prevent cars driving wheel slip, it must be carefully controlled throttle. Effect traction control system that automatically controls the driving force when the vehicle is accelerated, so that the slippage of a tire is within a reasonable range, so as to maintain the stability of the cars. This is similar to the role of anti-lock braking system, an antilock brake system is to prevent tire locking improve the driving stability when braking the car.
Control system:
traction control system control means is a computer. Using a computer to detect the speed of the four wheels and a steering angle of the steering wheel, when the vehicle acceleration, if the detected rotational speed to the drive wheels and non-driving wheel is too large, the computer immediately determines the driving force is too large, issues a command signal to reduce the fuel supply amount of the engine , the driving force is reduced, thereby reducing the driving wheel slip ratio of the tire.
Computer learned by steering sensor driver’s steering intention, and then using the left and right wheel speed sensor for detecting the left and right wheel speed difference; to determine whether the vehicle is turning and the degree of the driver’s steering intention same. If it is detected automotive steering (or oversteering), the computer immediately determines the driving force of the drive wheel is too large, gives an instruction to reduce the driving force in order to achieve the driver’s steering intention of vehicle stop, the speed of the four wheels are zero. When the vehicle is started, i.e. from zero vehicle acceleration, the traction control system detects a slip ratio of the driving wheels, if the detected slip rate is larger, issues an instruction to reduce the power of the engine, reducing the slip rate of the tire, when the car started, completely prevent tire slip is not enough, but the slip rate of the tire is too large, will accelerate tire wear, tire and reduce ground friction does little good to start to accelerate. When the tire slip rate is moderate, the car can obtain the maximum drive force. If the tire when cornering a greater slip, will accelerate the ability of the car changed for the better.
The system may utilize steering sensor detects a car traveling state, determines the car is traveling straight or cornering, and to appropriately change the slip ratio of each tire. But traction control system also has disadvantages. When the driver using the throttle opening, vehicle driving state adjustment, the system obstruct the driver’s driving intention. For example, the turning rear-wheel drive cars, in order to reduce the turning radius, skilled drivers tend gunned vehicle acceleration, the wheel slip utilizing the oversteer phenomenon, the state of the steering adjustments automobile. However, due to the traction control system, rear drive wheels can not slip. This prevents the driver’s driving intention, the car turned over a larger arc of the turn. In addition, some people believe that too much traction control system, to ensure that the system of steering by the driver’s intention. Casually ultra-high speed into the corner, is the result not appear understeer oversteer. Traction control and anti-lock braking systems, its role is limited, excessive dependence on these control systems are very harmful. [1twenty three]