P15.10-2637-79
Example illustration of engine 260 |
1.1 | Intake camshaft Hall sensor | 1.2 | Exhaust camshaft Hall sensor |
Overview
This document contains information on:
General
Location
Function
General
The camshaft Hall sensors detect the camshaft positions contactlessly for the following functions:
Camshaft adjustment
Synchronization of ignition and injection sequence
Recognition of ignition TDC (top dead center)
Emergency engine start in case of defective crankshaft Hall sensor
The camshaft Hall sensors are on the cylinder head above the respective camshaft.
Location
The camshaft Hall sensors are at the camshaft ends on the cylinder head.
Function
1 | Ground connection (pin 1) |
2 | Hall sensor signal (pin 2) |
3 | Power supply (pin 3) (12 V) |
A | Signal from intake camshaft Hall sensor |
B | Signal from exhaust camshaft Hall sensor |
P07.04-2565-06
The camshaft positions are detected by the camshaft Hall sensors. The camshaft Hall sensors detect the positions of the segments (of 180° camshaft revolution) on the corresponding camshaft.
The signal voltages of the camshaft Hall sensors are approx. 12 V (high), if the segments are not above the camshaft Hall sensors. When the segments move past the camshaft Hall sensors, the signal voltages of the camshaft Hall sensors drop to approx. 0 V (low).
The camshaft Hall sensors detect the camshaft positions when the engine is off, which enables quick starting of the combustion engine. This improves the exhaust gas values when starting the combustion engine because each cylinder can be immediately assigned the optimum fuel injection quantity.
If the signal from the intake camshaft Hall sensor is implausible or fails, the signal from the exhaust camshaft Hall sensor is used instead in order to detect ignition TDC in cylinder 1.
The gaps between the camshaft Hall sensors and the segments at the camshafts are not adjustable; they are predetermined by the installation position and cannot be adjusted.