1
what’s the use?
When the cruise control automatically from the vehicle in front, when a high-speed run more easily and securely.
2
Did you know?
· 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.
3
Technical principle:
The adaptive cruise control system (Adaptive Cruise Control, referred to as ACC) it is an intelligent automatic control system, which is already inDeveloped from the basic cruise control technology present on.
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 over the distance between the vehicle in front 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 the preceding vehicle always keep a safe distance.
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 the initiative braking operation. 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.
4
Operation:
Toyota Crown
Toyota Crown from cruise accommodate different names, 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.
populace the CC
direction of the driver toggle handle or lever from the side press button to start the system; up or down to move respectively increasing and decreasing the cruise speed 10km / h; small turntable gear lever can be adjusted to maintain the vehicle in front of the distance between vehicles, reducing the left, increasing to the right.
5
reading:
· radar performance
is a function of radar sensing relative distance between vehicles, the relative speed, the relative azimuth information. ACC radar system currently applied to the main radar, microwave radar, laser radar and infrared detection radar.
monopulse 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 that the detection accuracy is high, low price, easy to control, and secondary 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.
· recognize and track the target vehicle
it passes only radar detected object information to the ACC, ECU, ECU according to the identification information to be transmitted, is determined from a main ACC control target used in the reference, according to the relative motion between the two vehicles and the distance control of the main travel speed.
major objective is variable, the ACC system typically considered the main target inter-vehicle distance nearest to the main 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. An additional benefit of the main target tracking is the ability to predict the main vehicle to run in the next time state according to the operation of the main objectives.
Now, for example, the host vehicle along a straight road, and when the primary target vehicle has entered the curve, since the ACC system of the masterTarget tracking, so that the vehicle will not be on the front side of the fence or the lane considered the primary target, thereby avoiding the generation of false alarms; while the host vehicle is determined according to the target trajectory of the main road in front of a curve can be made main car ahead of time to prepare deceleration steering.