After the 2010 Beijing auto show debut at ease, FAW – Volkswagen CC sedan concern, expected to be available in July 2010. Different models were used Volkswagen car 1.8TSI and 2.0TSI (turbocharged direct injection) engine section 2, the maximum power of the engine 1.8TSI up to 118 kW, maximum torque 250 N? M, 2.0TSI engine maximum power up to 147 kW, maximum torque 280 N? m. This 2 respectively match the engine speed and the seventh speed 6 DSG dual clutch transmission. The perfect combination of TSI and DSG technology, making the car 0 ~ 100 km / h acceleration time of just 7.9 s, and at the same time has an excellent power performance, but also has the current international leader in fuel efficiency, significantly reduces fuel consumption and exhaust emissions . Further, in the safety and comfort configuration, in addition to the basic configuration of a high-strength body, like airbags, the CC further comprises an active cruise control system uses the ACC, road assistance system (lane departure warning) Lane assist, reverse image Rearview camera, a visual parking assistance system OPS, automatic parking assist system Park assist, adaptive active chassis control systems and air-conditioned seat DCC (active ventilation systems) and other advanced equipment. In order to facilitate the readers understanding of the car, some of the technical highlights of this paper will be CC’s body electrical system briefly.
1. active cruise control system ACC
ACC system of the distance and relative velocity before the radar sensor to monitor the vehicle, and controls the vehicle traveling in the same direction so that the driver of the preceding vehicle is provided to maintain given distance.
(1) system components
the ACC system of the headway control system control unit J428 (Integrated automatic headway control sensor G550), the power bus cut-off relay J788, meter control unit J285, and a control lever (Figure 1).
FIG 1
ACC sensor emits a frequency of 76.5 GHz, the detection distance of 150 m, a vehicle speed detection range of 30 ~ 210 km / h. ACC system activation preconditions for: gear lever D, S or Tiptronic position, the vehicle speed is between 30 ~ 210 km / h, ESP system is turned on.
(2) Calibration System
When the following conditions occur, the need for mechanical adjustment ACC sensor.
① rear axle chassis position change occurs.
② replace the sensor, the sensor holder, the front bumper of the vehicle engine compartment cover.
③ damaged front portion of the vehicle (e.g., vehicle collision).
FIG. 2
As (FIG. 2), the sensor S1 for the horizontal angle bracket (block 6-3 ACC adjustment sensor sensing area data), the sensor S2 is used to adjust the vertical angle bracket (area data block 6-2) ACC sensor sensing area.
When the ACC system calibration requires a special tool VAS6430 / 1 (calibration device) and VAS6430 / 2 (the laser emitter and the target disk).
2. road assistance systems (lane departure warning) Lane assist
road assistance system uses video cameras to monitor road conditions, if the vehicle deviates from the lane, the system will steering correction or by way of the steering wheel vibration and sound and light alarm warning.
(1) system components
Figure 3
Figure 4
[123 ] road assistance system is controlled by means of road assistance system, electric power steering control unit, the motor power, multi-function steering wheel, steering control and instrumentation unit (Fig. 3). Gray road assistance system control unit (including a camera) is mounted on the rear surface of the windscreen inside mirror (FIG. 4), it is detected by the camera according to the ratio determined lane marker (FIG. 5), and in accordance with the lane marker calculate the actual driving lane, the position of the vehicle in the lane. Road assistance system can calculate the current route is expected to operate under the driver of the vehicle, when the route is expected to be veering off the road, The system will be turned amended to ensure that vehicles traveling in the lane preset. Road assistance systems work must meet the following conditions.
FIG. 5
① speeds above 65 km / h.
② lane width of 2.45 ~ 4.60 m.
③ camera field of view and the camera must be able to clearly recognize the lane boundaries (sides of the lane marker). The distance between the
④ lane marker is not more than twice the length of the mark itself.
there are many roads will result in the above conditions can not be met, such as the road surface glare dazzling, snow cover, at the junction of asphalt, highway exit signs, road construction when the guide wire and the boundary marker or roadside turf will cause the camera can not correctly identify lane markings. This occurs, the meter will display text on road assistance system warnings, and accompanied by the sound warning.
(2) Calibration System
the same as the ACC system, road assistance system in certain cases also need to be calibrated, including the following situations.
① the road assistance system control unit stores “substantially not performed or settings incorrect” fault memory.
② replacement road assistance system control unit J759.
③ removal or replacement of the front windshield.
④ been adjusted to the rear axle.
⑤ been adjusted such that the suspension of the vehicle height varies.
⑥ replace the level sensor body.
Auxiliary system calibration required to road special tools VAS6430 / 1 (calibration device) and VAS6430 / 4 (calibration plate), the following points should be noted that the calibration.
⑦ control unit J759 road assistance system can not be covered.
⑧ road assistance system control unit installation area of the windshield must be cleaned.
⑨ road assistance system control unit installation area can not have broken windshield.
⑩ off all exterior lights of the vehicle.
11 ensure that the center front wheels and special tools have sufficient distance between VAS6430 / 1.
3. The parking assist visualization OPS
OPS reverse aid system is normal (reversing radar) extensions, which not only uses a different frequency sound signals to prompt the distance between the vehicle and the obstacle changes, and the distance of the vehicle relative to the obstacle in different colors of color displayed on the navigation screen.
4. The automatic parking assist system Park assist
Automatic parking assist system (i.e., the parking steering assistance system) are extended visual parking assistance system, equipped with an automatic parking assist system models can automatically turn the steering wheel in the process of parking, the driver only need to control the throttle, clutch and brake pedal to complete the parking procedure. The driver can intervene at any time during turning, if in the process of parking the driver grabbed the steering wheel, the automatic parking assist system will be shut down, continue to manual control by the driver to complete the parking process.
The constituent elements of the automatic parking assist system comprising: a parking assistance / parking steering assistance button, left front parking assist steering sensor, the steering sensor right front parking aid, a front parking aid sensor (4) rear parking assist sensor (4), a wheel speed sensor, the electric power steering apparatus, ESP control unit, the parking assist steering control unit J791, parking assist buzzer (front / rear) and a steering switch, each composition the mounting position of the element (FIG. 6).
Figure 6
(1) the parking assist / parking steering assistance button
E266 parking assist button for opening the front portion park distance control (parking assistance), if due to a technical failure park distance control related components fail, it will be alarm by the alarm lamp flashes. Park-steer assist button E581 for activating the parking aid parking steering function. If the parking assist can not be activated because of technical elements related to the failure, the alarm warning light flashes.
(2)Parking assist steering sensor
left front, right front parking assist steering sensor signal is a dedicated parking assist steering function, they may be used for measuring the parking space, and monitor the front end portion of the parking process lateral slot, while the signal is also used to calculate the angle of passing vehicles. Both sensors have self-diagnostic capabilities, if the sensor is faulty, parking assist steering function (PA) will not be used, but the parking assist feature (PDC) is still valid.
(3) a parking assistance sensor
sensor for measuring the distance from the parking assist vehicle with an obstacle near, distance control can be used for parking and the parking assist steering. All eight sensor having self-diagnostic function, wherein if a sensor failure will cause the parking assist steering and the parking assistance function are invalid.
(4) the parking assist steering control unit J791
J791 on the left of the steering column, above the central electrical control unit, integrated parking assist parking assist steering and visualization Features. That is, if the vehicle is equipped with an automatic parking assist system is not necessarily equipped with the parking assist control unit J446 (parking aid for visualization). If the vehicle is only equipped with J446, can not be achieved parking assist steering function.
The adaptive chassis control system DCC
CC chassis system focuses the suspension while maintaining the original platform adapted to sense movement at the same time, using an aluminum knuckle and a flexible connection body rear sub-frames, reducing vehicle rolling noise during driving, improved ride comfort. It also uses adaptive chassis control system consists of sensors electrically controlled damping system control unit and the adjustable shock absorber composition.
(1) Sensor
DCC adaptive chassis control system contains six sensors, three vehicle body height sensors, respectively, G76 (left rear), G78 (front right), and G289 (right front); other three vehicle body acceleration sensors, respectively, G341 (left front), G342 (front right), and G343 (rear). Each sensor is independently connected to the electrical control system damping control unit J250.
(2) electronic control system controlling dampingElement J250
The adjustable shock absorber is adjusted by the control unit J250 electrically controlled damping system, this control unit for adjusting the damping according to the Volkswagen Group developed control algorithm. Based on different input signals, the entire damper with adjustable pulse spectrum can be used. The control algorithm can be between three driving modes freely switch in the “normal”, “Sport” and “Comfort” by button, so as to achieve the needs of users.
J250 according to the road conditions, the different driving conditions (braking, accelerating or cornering) of the vehicle and the driver required adaptive shock absorber. Therefore, the driver can always get a good damping settings.
(3) adjustable shock
Figure 7
applied to the adjustable shock absorber DCC adaptive chassis control system , double pipe structure, is divided into two work stretch and compression stroke, as the structure (FIG. 7), the piston 1 within the working oil chamber, the oil chamber 2 comprising a cylinder, the oil has an additional air cushion chamber 2. Only some lubrication oil chamber, there is a cushion on the coil with defoaming fueling port, the oil chamber 2 to compensate for changes in the quantity of oil.
of the piston by the oil flow, the valve unit controls the damper base oil chamber and a regulating valve. The damping valve unit by a flat spring, coil spring, and a valve body with an oil passage configuration. Electronically controlled regulating valve is mounted outside the damper to adjust the damping force, by varying the current, the damping force of the shock absorber can be provided by adjusting the valve adjustment is complete in a few milliseconds.
the height sensor and the vehicle body acceleration sensor to collect information needed to calculate the damper setting. Dampers set pulse spectrum stored in the control unit J250 electrically controlled damping systems.
(Qiu Mengxuan)