DCCD - DRIVER CONTROLLED CENTER DIFFERENTIAL, DCCD- ჩვენს იმპრეზაში პარამეტრები

[sub_forester]

ამ თემას იმიტომ ვხსნი რომ უფრო უკეთ გავიგო ამ ნავაროტის შესახებ. როდის როგორ ჯობია მისი გამოყენება და რა სიტუაციებში.აბა მცოდნე ხალხს ვთხოვ აგვიხსნას ამ კარგი ღილაკის პლიუს-ინუსები.

DCCD - DRIVER CONTROLLED CENTER DIFFERENTIAL-არის...?
ეს რაც მე მოვიძიე:
DCCD - DRIVER CONTROLLED CENTER DIFFERENTIAL

THE PLANETARY CENTER DIFFERENTIAL IN THE WRX STI SPLITS ENGINE TORQUE IN VARIABLE RATIOS BETWEEN THE FRONT AND REAR WHEELS. IT ALSO GIVES THE DRIVER A CHOICE – LEAVE RATIO CHOICE TO COMPUTERS OR SET IT YOURSELF.


All-wheel drive performance cars are rare enough. But the WRX STi is even more unique because the driver can choose the value of the torque split between the front and rear wheels! Whether the driver makes adjustments to torque distribution in the manual mode via the console-mounted control wheel or entrusts distribution decisions to the DCCD control module through the automatic mode, the ratio of front/rear torque distribution can vary from 35 percent front/65 percent rear to 50 percent front/50 percent rear.

In automatic mode, DCCD varies torque according to input indicating acceleration, deceleration, cornering force and wheel slippage. In manual mode, the driver selects from six stages of center-differential lock-up. The more lock-up, the greater the torque directed to the front wheels – up to the 50 percent front/50 percent rear ratio. Mechanical limited-slip front and rear differentials enhance the system’s effectiveness.

The intent of the adjustable torque split is to improve handling and give the driver an increased sense of performance driving. DCCD accomplishes this through the integrated functions of numerous components.
THE PARTS

Along with the mechanical components in the center differential, DCCD utilizes control units, sensors and switches from around the STi. Among them are the mode switch and control wheel on the console, throttle position sensor, parking brake switch, wheel speed sensors, ABS control unit, lateral G sensor with yaw rate sensor, rear differential oil temperature switch, brake light switch and instrument panel lights.

At the heart of it all, electronic control of a multi-plate transfer clutch in a center differential planetary gear set determines the torque split between the front and rear drive wheels. The split ranges from completely “free” (35/65 ratio) to “locked” (50/50 ratio). Clutch control is by an electromagnet. To lock the differentials, the clutch plates function to restrict torque to the rear axle, distributing more torque to the front. Lowering the torque restrictions frees up the ratio for more torque to the rear.

Fail-safe contingencies are built into the system. Should the electric coils that operate the clutch within the differential fail, power to operate the clutch turns off and the driver is alerted by a warning light. Sensor failure anywhere within the system fixes the last reading of that sensor as a default, and the driver is alerted that a fault has occurred.
THE WHOLE

AUTOMATIC MODE. Unless the STi is used for all-out off-road rallying and/or the driver is competition-competent, automatic mode is probably the best choice. The system utilizes sensor inputs that indicate driving style and changing road conditions. In automatic mode, DCCD reacts quicker with changes in front-to-rear torque ratio than most drivers are capable. Grid Map: DCCD Automatic Mode



Under braking as the vehicle approaches a turn, the DCCD system reduces the restrictive force of the center differential toward a free state. Through a turn, between the turn-in point and the clipping point , the system receives input from the throttle as it opens and from the lateral G sensor. The center differential’s restriction torque gradually increases to improve cornering ability. Between the clipping point and the exit from the corner , input from the lateral G sensor decreases. The system increases the restricting force of the center differential toward the locked state to help maintain traction.

MANUAL MODE. Drivers who want or need to do things for themselves have six stages from which to select via the control wheel after hitting the DCCD manual switch. Both controls are on the console.

With the control wheel moved all the way forward, lock-up is 100 percent with torque distribution at 50 percent front/50 percent rear. The percentage of lock-up from the top “LOCK” stage to the bottom is:
100 percent (50% front/50% rear)
85 percent
65 percent
35 percent
15 percent
0 percent (35% front/65% rear)

(Also see the reactions of rally drivers/ice racers in the article “300-Horsepower Snowmobile” in this issue.)
PERSONALIZED PERFORMANCE

Automatic or manual mode, DCCD adds up to one of the most significant and enjoyable technologies in the auto industry. It enhances traction and control, which is much appreciated in a 300-horsepower performance car. Bring on the snow!

To see DCCD working in the hands of a professional race driver, go to www.drivesubaru.com. In the Online Exclusives box, select: “Training for Performance – Sales Consultants Learn More about the WRX STi.”
WRX STi COMPONENTS USED BY DCCD Wheel speed sensor
Rear differential oil temperature switch

Wheel speed sensor
Manual mode switch
Manual control dial
DCCD electronic control unit
Parking brake switch
DCCD indicator lights
Battery
ABS control unit
Wheel speed sensor
Brake light switch
Throttle position sensor
Accelerator pedal
Wheel speed sensor
Lateral G sensor (with yaw rate sensor for 2005)
Main gear input from the engine
Front output
Rear output
Transmission assembly
Center differential
ABS monitor signal

For more on WRX STI vehicle controls, see Blueprint: Tailoring the STI – VDC, DCCD, and SI-DRIVE.

[TaO]

ჰა აბა ვინც DCCD ხმარების გონზე არ ხართ თქვენთვის შჰექმნილია ზალიან მაგარი რაცხა


Feature overview
Plug-and-play USB interface
Four freely configurable DCCD control maps
Tunable Auto mode
Manual mode
Free firmware updates with improvements and new features
Full stand alone operation
Live output display
Built in precision 3-axis accelerometer
Data logging output
Parking brake override
ABS override
Input for integrating your own external sensors into your control maps e.g. gyros, accelerometers, steering wheel angle sensors, an external ecu input, an STI thumbwheel input, separate throttle and braking control maps and more!!
MapDCCD allows you to freely chose maps for road, wet track, dry track, autocross, rally, drag racing or fuel economy. Your maps can also be loaded from saved maps on your computer or downloaded from our website. Any of the four loaded maps can be selected on the fly - allowing you to select the most appropriate map for your driving conditions.

There are three main operation modes available. Any of the modes can be selected at any time. The three main modes are: manual, automatic and mappable modes 1 to 4. The MapDCCD controller lights will indicate the current operation mode and the live DCCD output.

Operation modes in detail

Manual mode
Manual mode is basic DCCD control. The front dial or external thumbwheel input is used to vary the static DCCD lock from 0 to 100%.

Automatic mode
Automatic mode is simple and automated DCCD control. Automatic mode varies the amount of DCCD lock based on your throttle position and your vehicles lateral acceleration using the built in accelerometers.

The DCCD lock is calculated using a continuous high speed mathematical model of vehicle dynamics to predict the required amount of DCCD lock.

The front dial or external thumbwheel input is used to vary the aggression of the vehicle dynamics model. Setting the dial high will bias the vehicle toward under steer tendencies, while setting the dial low will bias the vehicle toward over steer tendencies. The dial can be adjusted to any position in between to allow you to tune vehicle response to your preference.

Map modes 1-4
The map modes provide advanced DCCD control and are especially suited to a motorsports environment. Each map mode allows fine tuning of acceleration, braking, corner entry, corner exit and more

Each map mode has two main sections – The throttle section and the braking section. The braking section is activated when the foot brake is pressed; otherwise the throttle section is default.

Throttle section
The throttle section allows mapping of the DCCD lock based on four parameters: RPM, TPS, Vehicle speed and a sensor input. The sensor inputs available include internal lateral or longitudinal accelerometers or an external sensor.

Braking section
The braking section has two braking maps – one for when only the foot brake is applied and another for when the foot brake is applied and the throttle is also applied (and above a set threshold), deemed "left foot braking".

The braking section allows mapping of the DCCD lock based on four parameters: The foot brake being activated, TPS, vehicle speed and a sensor input. Like for the throttle section, the sensor inputs available include internal lateral or longitudinal accelerometers or any external sensor.



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