When the cruise control automatically from the vehicle in front, when a high-speed run more easily and securely.
1. What is the adaptive cruise
· automatically brakes does not mean you can relax, need to be vigilant at all times to take braking measures.
· When more rain and fog weather and corners, disable the cruise function, manual mode driving safer.
· This feature provides limited braking force, generally will not affect the comfort, when a larger deceleration, the system will prompt the driver to manually take over.
If the brake pedal or the accelerator manual intervention during cruise, the system will automatically cancel the cruise.
· adaptive cruise control activation requires certain conditions, specific methods of operation, please pay attention to your vehicle manual.
· Must have cruise control can there be this extension.
– the front portion of a vehicle equipped with an adaptive cruise control system generally have a radar sensor, if the collision damage will result in maintenance costs.
2. An adaptive cruise technical principle
The adaptive cruise control system (AdaptiveCruiseControl, referred to as ACC) is an intelligent automatic control system, which was developed on the basis of the cruise control technologies already present on the come.
In the traveling of the vehicle, mounted on a vehicle from the front portion of the vehicle sensor (radar) continuously scans the road ahead of the vehicle, while the vehicle wheel speed sensor signal acquisition.
When the distance between the front through the car hours, the ACC operation may be coordinated by the control unit and the anti-lock braking system, an engine control system, so that the appropriate wheel brake, and the engine output power lowered to the vehicle and always keep a safe distance from the vehicle in front.
When the control vehicle braking, braking deceleration limit will usually not affect the degree of comfort, when a larger deceleration, the ACC control unit will be audible signals inform the driver to take a braking operation active .
When the distance between the vehicle in front increases to a safe distance, ACC control unit controls the vehicle in accordance with the set speed.
3. The method of operating an adaptive cruise
· adaptive cruise Toyota Crown Toyota Crown name is different, specifically called Adaptive Cruise Control system (DRCC). The driver through the control lever to start the system the right hand side of the steering wheel, dashboard immediately ready prompt radar; button is then provided from the vehicle in front by the multifunction steering wheel; again after setting the cruise speed by the cruise control lever, then the driver can release his foot from the gas pedal.
· Mass CC toggle handle direction or from the side to the driver press the button to start the lever system; up or down to move respectively increasing and decreasing the cruise speed 10km / h; small gear wheel rod the vehicle in front can be adjusted to maintain the distance between vehicles, reducing the left, increasing to the right.
4. The adaptive cruise related reading
· performance of the radar function radar sensing is relative vehicle distance, relative speed, relative azimuth information. ACC radar system currently applied to the main radar, microwave radar, laser radar and infrared detection radar. Monopulse radar weather radar and microwave radar, may be for a variety of weather conditions, has a detection distance, a large detection angle range, the advantages of multi-target tracking. Lidar higher requirements for the work environment, sensitive to changes in the weather, in rain or snow, sand and other inclement weather days over the detection result is not limited detection range, the target track is less, but its biggest advantage is that a relatively high detection accuracy low price, easy to control and conductSecondary development. Infrared detection performance is unstable in bad weather conditions, the detection range is shorter, but the price is cheap. Regardless of the type of radar used to ensure real-time processing of radar signals it is to first consider the question. With the rapid development of automobile electronic technology, now mostly use DSP technology to radar signal processing, application CAN bus output radar signal.
* and the target tracking radar to identify the vehicle to which it can detect the object information to the ACC, ECU, ECU according to the identification information to be transmitted, it is determined from a primary target used in the ACC control reference, according to the relative movement between them and distance control of the host vehicle traveling speed. The main goal is variable, the ACC system will generally regarded as the main objective and the main workshop nearest vehicle. ACC system not only to determine the primary target, but should also be able to track it, either corner or down the ramp must ensure the consistency of the main targets, in order to reduce the false alarm rate of the system.
Another advantage of the primary target is tracked may be predicted according to the operation of the main objectives of the host vehicle running state at the next time.
Now, for example, the host vehicle along a straight road, and when the primary target vehicle has entered the curve, since the ACC system may track the primary target, it will not be on the front of the vehicle or next to a lane fence considered the primary objective , thus avoiding the generation of false alarms; while the host vehicle is determined that the road ahead is a curve, the host vehicle can be made ready in advance according to the deceleration of the steering running track of the primary target.