In Take/Drive By Wire Throttle/Sensors

InTake/DriveByWireThrottle/Sensors (2005-01-28 22:28:08)

'''This page is about the sensors related to

Absolutely required

2 pedal position sensors: the most important sensor, since this is the command from the driver.
2 break sensors: if there is an inconsistency between the 2 pedal position sensors, the slightest breaking will make the engine enter idle mode (eg.: fuelcut over 1600 RPM. Maybe a similar but not identical idle mode compared to what we have now).
1 throttle actuator

Nice to have

1..2 TPS: sensing the throttle position is nice
MAP and MAT
MAF - especially if EGR is used too. EGR complicates things.
WideBand
"service" ECU to watch the big guy

Pedal position sensor

Multiple throttle pedal position sensors and break sensor signal (available to the ECM of course) are a must => so a very reliable "effective TPPS" can be maintained with some fault tolerancy. With an electronic throttle-plate (an air-valve larger than an idle-valve) with a bad pedal position input only redline fuelcut will stop the RPM-rise or a brick wall. With the break-sense the ECM can enter idle-condition so the overrun fuelcut (much below redline) will make it somewhat safer.

LVDT (Linear Variable Differential Transformer)

[how a LVDT works]

http://www.sensotec.com/lvdt.asp

For fully throttle-by-wire a [pedal-position sensor] is used.

Note: throttle-by-wire can be very dangerous especially for an AutoTrans equipped car if not done with same care and redundancy as aviation control equipments.

WhatEverYouDoYouDoItAtYourOwnRisk

See also

InTake/DriveByWireThrottle