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IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now. Visit Preferences to set your user name Summary of change: '''This page is about electronically controlled throttles. This technology is getting common''' If I wrote an intro it would be similar to [http://autospeed.com/cms/article.html?&A=1025 this autospeed article] (except their English is better and they apparently worked on it more than I would have :-). This page is an index page, and some words about the actuators. However a complete system is much more than that. Redundant network of sensors, smart software and good understanding of failure modes. See InTake/DriveByWireThrottle/Sensors Besides the VAG item there are others too. (make a separate page if info about a particular part > 8 lines) ---- '''Vag''' Throttle body with DC motor and position sensor: InTake/ThrottlePlates/VAGElectronicThrottle There is also a smarter type with CAN interface, but we know little details. ---- '''PSA''' I heard that PSA's shipping lotsof cars (Peugeot 307 and Citroen C5 comes to mind) with drive-by-wire throttles (for years now). That means they should be available for cheap. Dunno about bus (CAN is likely). No CAN, but just - KISS (keep it simple stupid) - gear motor with position sensor(s). fex. Electronic throttle body fitted to EW12J4 engines (often found from Peugeot 407, 607, Citroen C5 etc.). Casting is made by Solex (type 'Solex 1943'), electronic unit (motor and potentiometer(s) are made by Magneti Marelli (type CTS CA.0011607B). Throttle plate diameter 61 mm, flange polt pattern 60x60 mm. Connector has 6 pins in one row. Throttle closed pin 1-2 1.89 kOhm pin 1-5 2.46 kOhm pin 1-6 3.71 kOhm Throttle open pin 1-2 3.92 kOhm pin 1-5 2.46 kOhm pin 1-6 1.75 kOhm pin 3-4 2.3 Ohm (DC motor, with gearing) pin 3 = (+) pin 4 = (-) - has spring return to closed position. ---- '''Opel, BMW''' New opels have a throttle body manufactured together with the plenum, but the actuator motor (stepper motor inside? I doubt CAN): * Bosch 0205001039 (058?) electric motor * with AMP 2-828736-2 connector (2nd line empty of the 4 lines, 4x2 total) seems to be available < 200 Euro. Used on Y20XE,Y22XE,Z22XE engines. ---- '''Home made''' [http://www.egr.msu.edu/autoweb/Class/Proj_2001/throttle/project.htm designing an electronic throttle.] MembersPage/PetrPodrazsky plans to install one on his engine from DC motor. Controlling it via MAP reading, an appropriate (TPS, RPM, TPSdot) => MAPtarget function can make wonders. Note that it's not very good if it sticks open, but the revlimit fuelcut will save your engine if you're foot is on the throttle, and overrun fuelresume is very handy when TPS=0. If the throttle is slow, it's impossible to make a nice response system. 150..200 ms is nice from end2end. Appr. 10A drivers are required for that. ---- '''Issues''' Such items are '''only for very experienced installers'''. '''Control algorithm''' Very similar to the BoostController: (effective) TPS => MAPtarget, measured MAP => actuation Michael adds: I've also been thinking a lot about implementing drive by wire throttle for a plug and play STi ECU. Also the Audi S4 could benefit and I have a customer with a Nissan Sentra SpecV turbo that is drive by wire. The control algorithim used by OEMs is extremely complex. It is not simple enough to request a MAP value and have the throttle achieve it. The throttle tends to lag a little from the input and this makes rev matching very difficult with the dumb systems. Some of the nicer systems STi in particular knows what gear you are in and detects a throttle stab to precisely rev-match a downshift. Give anything from a mild to a hard stab and she rev matches perfectly. The ECU also appears to learn how to rev match through some sort of adaptive control. Another whole aspect is in the safety arena. The ECU must detect a failed e-throttle and use another means of control (throttle controlled rev limit). It should also detect when the brakes are applied and use that coupled with the vehicle speed to allow braking. The cat's ass would be a variable brake input to allow proper left foot braking but at higher pressures allow the override to slow the car in the event the throttle has failed open. WhatEverYouDoYouDoItAtYourOwnRisk ---- '''See also''' * InTake/DriveByWireThrottle * InTake/ThrottlePlates * CruiseControl Optional: Add document to category: Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.