cruise control (CCS or GRA) function is the change in the vehicle are automatically compensated for rolling resistance and air resistance during driving, the driver manipulates accelerator pedal without the need to maintain a constant vehicle speed can function. On Audi, when any vehicle speed at 30 km / h or more, after the user presses the cruise switch cruise function is turned on, the engine control unit may automatically calculate and adjust the throttle opening so that the vehicle remains at the current vehicle speed, even in on downhill gradient resistance change can be achieved. But the intention of the driver is still a first instruction, you can be accelerated at any time, if you want to cancel this function, only the brake pedal (or clutch pedal), or by direct manipulation of the handle to close. In addition to maintaining the function of the vehicle speed constant current, the cruise system also provides a range of auxiliary functions, cruise control and therefore can not only improve maneuverability during long trips can be avoided because the good road conditions inadvertent speeding behavior. As the throttle actuator ME-Motronic control system has been integrated in the ETC function module, so for most Audi models, even when the car original car is not equipped with cruise control, want to install the system are possible. In order to facilitate understanding of the installation of the original car Audi car cruise system, following the author to introduce to readers here about the specific methods and procedures.
First of all, we need to determine whether the vehicle is equipped with cruise control system CCS. The easiest way is there to see near the steering wheel switch or similar cruise Cruise marked with the word button. When users complain vehicle cruise control function does not work, you need to confirm his car with this feature, and then verify that the actual function, attention cruise only works if the 30 km / over speed h, and as long as riding the clutch or brake pedal, this feature off immediately, that is to say if the two pedal switch fails (ON maintained) then the cruise function can not be used. Second, the need to check whether or not the engine control unit has been turned on known cruise. For most Audi, the address code 01 into the fault diagnostic G by the control unit to indicate on the description of the cruise function (FIG. 1), without the G to turn this feature is not represented.
FIG 1
For different AudiType, method of installation and activation of the different CCS. Communication from the vehicle up points, there are two ways: directly to the engine cruise switch and the cruise switch control unit transmits a signal to the engine control unit via a bus.
(1) directly connected to the engine cruise switch control unit
FIG. 2
For Audi C5A6 car, the cruise switch directly through a wire connected to an engine control unit (FIG. 2). As can be seen from the circuit diagram (FIG. 3), for Audi C5A6 car, the CCS system when installed, need to install a cruise switch the E45, and the circuit diagram on the pin 6 connected to switches 15 controlled by the ignition switch power supply terminal, the foot rest according to FIG 2,3,4,5,7 connected to respective pins on the engine control unit. In fact, the original car engine has reserved the corresponding harness wire, the wire harness on the switch simply diverted to drain groove T15e electric control box to white 15-pin socket.
Figure 3
Next, the function required to activate the software. For Audi C5A6 models may enter through the decoder engine control unit 01 the address code, and select the channel number 11 and enter a login mode is Access Code 01-11-11463 activate the function, then re-enter the engine control unit, will appear in FIG. 1 numeral G; conversely if the engine control unit having a function of CCS is mounted on a vehicle without a mounting of CCS, we can turn this feature off by 01-11-16167.
(2) the cruise switch signals to the engine control unit through bus
For subsequent Audi B6A4, B7A4 and C6A6, the cruise switch signal is no longer simply connected directly to the wire the electronic control unit steering engine control unit, but beneath the steering wheel by a new cruise switch receiving J527, the turn signal switch and a wiper switch respective switches, etc., and is sent to the control unit via the respective comfort CAN bus by the respective switching state J527 (Figure 4).
FIG. 4
on the mounting hardware, and Audi A4 A6L installation easier, because the switch between J527 and E45 is not connected to the wire, but directly inserted on the J527, J527 and comfort to the gateway and CAN gateway to the engine control unit are installed in the driver CAN original vehicle, without adding means. It is noteworthy that only need to install a separate lead pin 44 to the engine control unit 5 feet from the J527 for activating CCS.
Although the hardware is simple, but the software will have to set complicated, because the control unit involves the need to activate the encoder.
{1} to start the activation of CCS J527, enter the address code 16, encoding selected function, encoding a total of six digits J527, wherein the change of position penultimate to 2, i.e., change to 16-07 -xxxx2x, (x represents the original code unchanged); J527 know so installed and to switch the switch CCS signal is transmitted to the bus.
{2} Next activated from the engine control unit J220 CCS: C5A6 different from the log, and A4 A6L required for encoding function, into the address code 01, encoding selected function, and for A4 is A6L the engine control unit is a length coding, it requires changes to the sixth byte 01 bytes remaining unchanged.
After the installation of the above method CCS system, need to focus on the road test function testing: normal switching function; CCS is activated if the meter indicator opening; CCS can be closed if the foot brake.
updated car models, in addition to the cruise control, adaptive cruise also developed a higher level. Adaptive cruise control system ACC (Adaptive Cruise Control) is another Audi technology developed on the basis of the original cruise control on. Simply put, the main function of adaptive cruise system is that it not only with the traditional cruise control system as to ensure that the driver can select a certain speed, and can keep the car away from the front of the vehicle, which means it is the speed with car from the combination of control. System hardware change is to ascertain the maximum vehicle speed and the preceding vehicle from the vehicle by mounting the radar detector front bumper below.
If the two is greater than the desired distance from the vehicle, the vehicle will accelerate the vehicle speed to a desired pre-set by a driver; when the two vehicles is less than the desired distance from the vehicle, the vehicle will reduce the power by the engine, transmission gear switch, even if necessary, to enable the brake to slow the vehicle speed to ensure that the set distance between vehicles. This system further enhance driving comfort, eliminating driver fatigue and improve traffic safety benefit.
(in Jin Tao)