Elect lectron ronic ic Thrott hro ttle le Control ont rol Sys yste temmintell in tellig ige ence nc e (E (ETCS-i)
•Power •Powerpoi point nt presen presentat tation ion of the ETCSETCS-ii •Explains the operation and advantages over mechanical-linked throttle control (e.g. emissions, throttle control) •Explains the failsafe mechanisms of ETCS-i
Electronic Throttle Control System - i ntelligence ETCS-i
AGENDA 1. In t r o d u c t i o n 2. ETCS-i contr con trol ol mode mo des. s. 3. Type ypes s of ET ETCS-I. 4. Lin Link k typ t ype e sy syst ste em ope o pera ratio tion. n. 5. Link Linkle less ss typ type e sys syste tem m ope opera ratio tion. n.
Introduction The Accelerator Pedal Pedal Posi tio n Sensor (APPS (APPS)) detects detects the accelerator p edal edal posit ion (driv er in put) and sends sends a signal to t he ECM ECM.. Based Based on the input from the th e APPS APPS and and other ot her ECUs (ABS, TRAC TRAC and VSC), VSC), the engin e ECM ECM directs dir ects the th e Throttle Control Motor to ch ange thrott le valve valve posit ion. The Throttle Posit Posit ion Senso Senso r (TPS) (TPS) detects t hro ttl e valve valve angle and and conf c onf irms ir ms t o th e ECM ECM that th e desired throt tle valve positi on h as been been achieved. achieved. Both t he APP APPS and t he TPS TPS have two sensing elements. elements.
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Electr Electroni onic c Throttl Throttle e Control Control Syste System-i m-inte ntelli lligen gence ce (ETCS (ETCS-i) -i) provi provides des sever several al advant advantage ages s over a mechanical linked throttle valve system as the ECM can position the throttle valve for optimum performance under a variety of conditions.
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The ETCS-i ETCS-i system system gives gives the the ECM ECM prec precise ise contro controll over over the the openi opening ng and and clos closing ing of the throttle valve, based upon the driver’s input (accelerator pedal).
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And in conjun conjuncti ction on with with inpu inputt from from chassi chassis s cont control rol ECUs, ECUs, such such as as those those for Tracti Traction on Control and Vehicle Stability Control (Skid Control ECU).
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This This system system not not only only enha enhance nces s drive drive line line contr control, ol, but but also also assis assists ts in redu reducin cing g tailpi tailpipe pe emissions and improving fuel economy.
Introduction The ETCS-i system allows the ECM to precisely control the opening and closing of the throttle valve based on drivers input and is also interrelated with chassis control ECUs such as Traction Control and Vehicle Stability Control (Skid Control ECU).
ETCS-I Co Co n t r o l m o d es • The The ECM ECM dri drive ves s the the thro thrott ttle le valve valve to a spec specif ifie ied d angle as determined by operating conditions. • Diff Differ eren entt thro thrott ttle le val valve ve ang angle les s in rel relat atio ion n to the the accelerator pedal position are used to achieve different engine output characteristics. • The The fol follo lowi wing ng desc descri ribe bes s the the diff differ eren entt mode modes s that that affect throttle valve angles.
ETCS-I Co Co n t r o l m o d es • • • • • • • •
Non-linear Control Power mode contr ol Snow mode control Shift shock s hock reduction control Idle speed speed cont c ontrol rol TRAC thrott thr ottle le contro con troll VSC coordi coo rdination nation contro con troll Cruise ruis e control contr ol
Ty p es o f ETCS-i • Link type system (1s t Generation)
• Linkless type system (2n d Generation)
Ty p es o f ETCS-i
Link Li nk ty type pe sy syst ste em ope o pera rati tion on Operation: •
The The thro thrott ttle le mot motor or ope opera rate tes s the the thro thrott ttle le val valve ve..
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An ele elect ctro roma magn gnet etic ic clu clutc tch h conn connec ects ts the the thr throt ottl tle e moto motorr to the the thro thrott ttle le val valve ve..
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The The thro thrott ttle le pos posit itio ion n sens sensor or det detec ects ts thr throt ottle tle valve valve angl angle. e.
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The The Accel Acceler erat ator or Ped Pedal al Pos Positi ition on Sen Senso sorr (APP (APPS) S) det detec ects ts acce acceler lerat ator or peda pedall position.
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The The thro thrott ttle le lev lever er is is conn connec ecte ted d by cab cable le to to the the acce accele lera rato torr peda pedal. l.
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As the the dri drive verr moves moves the the acce accele lera rato torr peda pedal, l, the the APP APPS S sign signal al vol volta tage ge changes indicating a new pedal position.
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The ECM then then adju adjusts sts the thrott throttle le angl angle e base based d on on the the APPS APPS signals signals,, engin engine e conditions and vehicle conditions.
Link Li nk ty type pe sy syst ste em ope o pera rati tion on Fail Fail Safe Safe Mode: Mod e:
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If an an abnor abnormal mal condit condition ion occur occurs s with with the the ETCSETCS-i, i, the the MIL MIL will will illum illumina inate te to to alert alert the the driver.
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At the the same same time time,, curren currentt to the thro throttl ttle e contr control ol moto motorr and and magne magnetic tic clut clutch ch are are cut cut off. off.
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With With no no powe powerr to to the the motor motor or or magn magneti etic c clut clutch, ch, the retur return n sprin spring g closes closes the thrott throttle le valve to the default position.
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In this this situat situation ion,, called called limp limp mode, mode, the accele accelerat rator or peda pedall opera operates tes the the limp limp mode mode lever.
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When When in limp limp mode, mode, the the thr thrott ottle le can can only only be part partial ially ly open opened ed redu reducin cing g engin engine e power power..
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The The drive driverr will will noti notice ce the the pedal pedal trav travel el is is longe longerr in relat relation ion to engine engine respon response se and and that that the MIL is on.
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Furt Furthe herm rmor ore, e, ISC ISC and and cru cruise ise cont contro roll syst system ems s will will not not ope opera rate te..
Link Li nkle less ss typ t ype e sy syst ste em ope op era rati tion on Operation: • The The link linkle less ss ETCSETCS-ii uses uses a com compa pact ct thro thrott ttle le bod body. y. • No mechan mechanica icall conn connect ection ion betwee between n the the accele accelerat rator or pedal pedal and throttle body. • The The Acce Accele lera rato torr Peda Pedall Posi Positi tion on Sen Senso sorr is mou mount nted ed at at the the accelerator pedal. • As the drive driverr mov moves es the accele accelerat rator or pedal, pedal, the APP APPS S sign signal al voltage changes indicating a new pedal position. • The ECM then then adju adjusts sts the thrott throttle le angle angle based based on the APP APPS S signals, engine conditions and vehicle conditions. • The thrott throttle le positi position on sensor sensor detect detects s thro throttle ttle valve valve angle angle.. • This This syst system em does does not not use use a mag magne netic tic clut clutch ch.. • Operat Operation ion of this this syst system em is nearl nearly y iden identic tical al to the link link type type
Link Li nkle less ss typ t ype e sy syst ste em ope op era rati tion on Types of Acce Acc elerator lerator and Thro Thrott ttle le posit pos ition ion senso sensors: rs: 1. Non contact type sensor. 2. Contact type sensor •
While hil e the senso sensors rs genera generate te their their output out put signa sig nall in in a diffe diff erent rent process, p rocess, common simila simi lariti ritie es includ in clude ed: 1- The Sensor Sensor operate operate at 5.0 5.0 volts which which is supplied supplied by by the ECM’s VC power source 2- They utilize utilize the the same senso sensorr ground ground terminals terminals of the ECM, ECM, E2. 3- They both output output a linear linear DC DC voltage voltage
Link Li nkle less ss typ t ype e sy syst ste em ope op era rati tion on Fai Fai l Safe Safe mode: mo de: 1- Accele Accelera rator tor position sensor: sensor:
Link Li nkle less ss typ t ype e sy syst ste em ope op era rati tion on Fail Safe mode: 1- Throttle position sensor: sensor:
Electronic Throttle Control System
History
Electronic Throttle Control System Toyota Cars 2000
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Avalon Camry Camry HV Celica GTS
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Celica GT
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Corolla Corolla XRS
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Echo Matrix
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Matrix XRS
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Prius Solara
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Solara V6
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Yaris
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Electronic Throttle Control System Toyota Trucks 2000
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2006
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Rav4 V6
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Sequoia
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Sequoia 5.7L
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Tundra 5.7L
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Venza
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2007
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4Runner FJ Cruiser Highlander Highlander HV Rav4 L4
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Sienna Tacoma L4 Tacoma V6 Tundra 2UZ Tundra 5VZ
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2009
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Electronic Electronic Throttle Throttle Control Control System - Lexus 2000
2001
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2003
ES 300 ES 330
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ES 350
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2004
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GS300 N/A
GS400
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GS430
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GS450h
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GS 460
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GX 460
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GX 470
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IS 250/C
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IS 300
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IS 350/C
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LS 400
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LS 430
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LS 460
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LS 600h
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LX 470 LX 570
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RX 300
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RX 330
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RX 350
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RX 400h
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RX 450h
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SC 300/400 SC 430
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