L-Finesse

Hi,

Anybody knows the difference ??

Vehicle Dynamic Control (VDC) which is the system that Infiniti vehicles provided with.

Sorry if the question is not clear because I am not an English native speaker.

Thank you

waiting for the answer

spwolf

VDIM is next generation system that improves greatly on old school ESP system. Basically everything is integrated - steering, wheels, throttle control, brakes, so VDIM reactions are way more fluid and more natural than old school esp systems.

You can search the board, there was an video that shows the difference and it is huge.

jyg es3

some has commented . VDIM, has made the handling of the car feel very artifical.

flipside909

That wasn't what the original poster was asking. He was asking how VDIM works and what relation w/the Infiniti VDC system.


Vehicle Dynamics Integrated Management (VDIM):
Vehicle Dynamics Integrated Management (VDIM) [1] is a system which integrates braking, steering, Vehicle Stability Control (VSC) [2] and Traction Control (TRAC) systems to help minimize loss of traction in a turn.

Here's more indepth info on VDIM and how it works in conjunction to Lexus VSC, TRAC and also in conjunction to the ABS system.
http://www.lexus.com/models/gs/safety.html#stability

spwolf

thats not true. Old school ESP systems are indefinetly worse than VDIM in feel of the system, much, much worse because correction it applies are very abrupt and harsh.

What you are talking about is comments of magazine journalists who cant turn off VDIM, and hence complain about it. So what they are complaining about is the handing of the car, once tires loose grip, since then VDIM takes over. If you would compare handling of car with VDIM and car with old school ESP, VDIM actually feels much better and handles much better. But you cant turn it off and get your back to dance for the photo shoot, hence its BAD! :-)

VDIM also makes car much more secure in adverse conditions such as ice, snow, heavy rain...

L-Finesse

thank you guys for joining

so, do you mean guys that VDC and ESP are the same ?? only diffrent in names ??

thank you >>>>

XeroK00L

There was a GREAT video that explains how VDIM works and its advantages over the traditional VDC directly from Lexus internal training a while ago in this thread:
https://www.clublexus.com/forums/sho...d.php?t=152355

Too bad the video seems to have been taken offline. Anyone still has a copy?

Lexus is really stupid not to put that awesome video on their main website. Instead they're putting this crap that really shows NOTHING on their current page:
http://www.lexus.com/models/rx_hybrid/performance.html

LexFather

Here is Infiniti VDC explained

Vehicle Dynamic Control (VDC)

Vehicle Dynamic Control helps to improve vehicle stability during understeer, oversteer or adverse road conditions. The system automatically engages to help the driver maintain control by engaging brake pressure and/or engine torque automatically.

Many skids that cause a loss of vehicle control are caused by understeer, where the vehicle "plows" ahead even with the steering wheel turned sharply, or oversteer, where the vehicle turns more than the steering wheel position requires, causing it to swerve at the rear.

VDC helps control lateral skids on slippery or dry road surfaces by detecting and correcting understeer and oversteer conditions. The VDC system electronically monitors vehicle speed and direction, and compares the vehicle's direction of travel with the driver's steering, acceleration, and braking inputs. VDC can use throttle intervention and/or apply individual wheel braking to help control a discrepancy between where the driver is steering and where the vehicle is heading. The system integrates traction control to limit spinning of the drive wheels on slippery surfaces.

VDC uses some components shared with the anti-lock braking system (ABS) and an electronically controlled engine throttle, as well as a dedicated computer and sensors.

The VDC controller constantly compares the driver's intentions - as indicated by steering wheel, throttle and braking activity - with the car's actual motions measured by various sensors. If they do not correlate, the VDC computer selectively applies individual wheel brakes and/or momentarily reduces engine power as necessary to help the car regain lateral control, within the limits of the tires' traction and the laws of physics.

For example, if the car were tending to continue straight rather than responding to the driver's right turn of the steering wheel, VDC would typically reduce engine power to shift the vehicle's weight to the front wheels to help provide more traction for steering. At the same time, VDC would apply the right front brake momentarily to help the car turn to the right more quickly. Once proper vehicle attitude is restored, VDC returns to a standby state.


Here is LEXUS VDIM explained


Lexus Introduces Next Generation Vehicle Stability Control System in New 2006 GS 430

TORRANCE, Calif., Feb. 1, 2005 -- With the introduction of the 2006 GS 430 luxury sport sedan, Lexus puts a window on the future of advanced automobile handling technology with its new Vehicle Dynamics Integrated Management system (VDIM). Through the intelligent use of the latest technology, VDIM helps to improve handling and driving pleasure, even in the most challenging conditions.

"Making our vehicles both secure and enjoyable to drive is one of the highest priorities at Lexus," said Lexus Group Vice President and General Manager Denny Clements. "The new GS is already a great handling car, but VDIM allows it to be driven much closer to its limits while maintaining the seamless quality of operation that our customers expect."

VDIM enhances handling and traction control systems that normally react to an already unstable condition by anticipating tire slippage before a skid, slide or wheel spin occurs and make stabilizing corrections that maximize dynamic capability. This coupled with tight integration of all systems makes VDIM feel transparent to the driver, making driving more enjoyable.

To do this, VDIM uses an active control strategy that takes its cues from a comprehensive range of sensors including steering angle, yaw rate, deceleration, brake pressure, brake pedal stroke, wheel speed and others. Their signals are used individually by the various traction control systems and collectively by VDIM. Data is gathered from more sources and processed earlier and faster than previous designs, helping to make VDIM less obtrusive yet highly effective.

These proven systems include Vehicle Stability Control (VSC), Traction Control (TRC), Brake Assist (BA), Anti-Lock Brakes (ABS) and Electronic Throttle Control with intelligence (ETC-i). In addition, three important new technologies are employed that are central to the effectiveness of VDIM: Electric Power Steering (EPS), Variable Gear Ratio Steering (VGRS) and Electronically Controlled Brakes (ECB). VDIM then integrates all of these elements with powerful proprietary software to help manage the total vehicle dynamic package.

ECB is one of the key new technologies that make VDIM possible. It's a "brake-by-wire" system that translates brake pedal pressure into electric signals that, via computer control, help provide precise and optimized braking control in virtually any traction condition. The ECB system is also backed by conventional hydraulic brake control in the unlikely event of electronic failure. ECB's electronic control provides quick brake response when needed, which helps the VDIM system to anticipate and help correct skids before they happen.

Although new in this application, the VGRS system is a further development of the technology recently introduced on the Lexus LX 470. VGRS provides two benefits that the driver can feel by electronically adjusting the steering ratio according to vehicle speed.

First, it provides a relatively quick steering ratio in very low speed conditions, which notably improves maneuverability for parking and similar situations. From low to medium speeds the steering ratio progressively slows to appropriate levels for driver comfort in city driving. In higher speed conditions such as freeway driving, the steering ratio is reduced (slower) in order to help provide a more secure and comfortable feel for the driver.

Another important function of VGRS is called "differential steering control" which helps the steering system correct for a delay in steering response-something that occurs in all vehicles. This function helps enhance driving feel in lane changes and other transitional situations.

Perhaps most importantly, in difficult driving conditions VGRS interacts with other systems via VDIM to actively and automatically apply subtle changes in steering angle, ratio and effort in order to assist the driver in maintaining smooth control, even in side winds, all while remaining virtually transparent to the driver.

EPS is yet another important steering development that makes contributions to driving feel and controllability. Rather than using the purely passive hydraulic assist found in conventional power steering systems, EPS uses precise electronic assist via the built in DC motor in the steering gear housing. The assist is computer controlled to help provide comfortable and controllable levels of steering effort in most driving situations. With VDIM interaction, the amount of assist can be instantly varied for the conditions at hand.

By eliminating the engine-driven hydraulic pump, EPS also reduces fuel consumption. And stripped of the usual hydraulic system of pump, hoses, pipes and fluid, the simplified steering gear is lighter and more compact than conventional steering systems.

With all of the traction control technologies working together under the VDIM "umbrella," handling and smoothness is dramatically improved. Whether driving through town or enthusiastically on a winding road, the VDIM system works constantly and seamlessly to maintain comfort and handling balance, without spoiling the fun. This makes VDIM a perfect match for the high performance levels of the 2006 Lexus GS 430 luxury sport sedan.

L-Finesse

thank you guys again

XeroK00L
Actually I have this video already, but it is just explaining the VDIM without saying anything about VDC !

If you want to download the VDIM video you should have
Download Accelerator Plus 7 ......so when you open the page( I mean the video page ) ...downloading will start automatically..

video page : http://www.lexus-eshowroom.com/eshow...wmv&type=video

1SICKLEX : woooooow …… very useful information …. Thank you very much.


waiting for more and more