RPM Request, Basic Function - GF07.10-P-1061A
Engine All (4xWD)
Engine All (CAR)
Overview
This document contains information on:
- General
- Function requirements
- Function
General
The combustion engine control unit continuously requests the engine speed as a basis for calculating numerous control procedures. The crankshaft Hall sensor generates voltage signals and forwards them to the combustion engine control unit. The combustion engine control unit calculates an engine speed signal on the basis of the voltage signals and forwards it to the connected control units via the bus system.
Function requirements
- Engine management ON (circuit 87M)
- Engine in operation
Function
A sensor rotor with magnetic terminal fields that differ in terms of their polarity is located on the crankshaft. The rotation of the sensor rotor allows the crankshaft Hall sensor to generate square wave signals.
The combustion engine control unit evaluates the square wave signals and calculates the engine speed and crankshaft position. Depending on the number of terminal fields, one terminal field or one square wave signal specifies a particular change of the crankshaft angle. The absolute position of the crankshaft can be determined on the basis of an irregularity of the sensor rotor, e.g. in the case of missing terminals.
In the event of an engine stop, the engine may change its direction of rotation shortly before it comes to a standstill. The combustion engine control unit detects the reversal of the direction of rotation on the basis of the pulse width of the square wave signal and can still detect the exact crankshaft position. This information is required when quickly starting the engine in ECO start/stop mode.
If the voltage signal from the crankshaft Hall sensor fails, the voltage signals from the intake camshaft or exhaust camshaft Hall sensor are used for limp-home mode as a substitute.
| Function schematics | |||
| Function schematic for rpm control | Engine 608 in model 118, 177, 247 | PE07.10-P-2500-97A | |
| Engine 282 in model 118, 177, 247 | PE07.10-P-2500-97B | ||
| Engine 260 in model 118, 177, 247 Engine 264 in model 167 | PE07.10-P-2500-97C | ||
| Engine 654 in model 118, 167, 177, 247 Engine 654 in model 213, 238, 257 as of model year 2021 Engine 656 in model 167 | PE07.10-P-2500-97D | ||
| Engine 256 in model 167 Engine 256 in model 213, 238 as of model year 2021 Engine 264 in model 213, 238, 257 as of model year 2021 | PE07.10-P-2500-97E | ||
| Engine 176, 177 in model 167 Engine 177 in model 290 as of model year 2021 | PE07.10-P-2500-97F | ||
| Engine 139 in model 118, 177, 247 | PE07.10-P-2500-97G | ||
| Engine 254 in model 206, 214, 236, 254 Engine 256 in model 214, 223, 236 | PE07.10-P-2500-97H | ||
| Engine 176 in model 223 | PE07.10-P-2500-97I | ||
| Engine 279 in model 223 | PE07.10-P-2500-97J | ||
| Engine 139 in model 192, 206, 232, 236, 254 | PE07.10-P-2500-97K | ||
| Engine 654 in model 206, 214, 236, 254 Engine 656 in model 223 | PE07.10-P-2500-97L | ||
| Engine 177 in model 192, 223, 232 | PE07.10-P-2500-97M | ||
| Engine 274 in model 213 as of model year 2021 | PE07.10-P-2500-97N | ||
| Engine 656 in model 464 | PE07.10-P-2500-97O | ||
| Additional basic functions | |||
| Crankshaft Hall sensor, basic function | GF07.04-P-2004A | ||
| ECO start/stop, basic function | Engine all (CAR) | GF07.10-P-1051A | |
| Detailed information | |||
| Rpm request, detailed information | All models, with starter-alternator (ISA) | GF07.10-P-1100A |