Peripherals - Bosch ECU MS 25 Sport Manual

Bosch Motorsport

3 Peripherals

Sensors and peripherals can be checked when the system is powered up electrically using
the Engine On -switch.
CAUTION
Do not start the engine before all steps in this chapter are com-
pleted.
Make sure the battery is connected properly, all sensors are connected, and ground wiring
is fixed before powering up the system. Check all sensors for errors (E_...) and reliable
measure values before starting the engine.
APS safety
– Acceleration pedal and its position sensor is the main request for engine torque (in-
jection quantity) in common rail Diesel engines. As this is considered drive-by-wire
system safety features have been introduced on the MS 25 Sport ISAPS function.
– APS has to have two signals, main pedal signal 1 and redundant signal 2 with 0.5
scale.
– Calculated difference of pedal signal 1 voltage – 2*pedal signal 2 voltage has to be
below 0.5 V or less than UAPS_CM_MAX
Analog sensor inputs
Inputs with fixed pull-up resistors are prepared to handle passive sensor elements, for in-
stance temperature sensors with integrated resistors (NTC- or PT100 sensors). Inputs
without any pull-up resistors are prepared to handle active sensor elements, which deliver
0 to 5 V signals, for instance pressure-, potentiometer- or acceleration sensors. Each
sensor input is mapped clearly for pressure or temperature measurement in the pinout
and the only exception is exhaust gas temperature, where only 0 to 5 V output sensors are
supported.
Error detection of an analog input signal detects short circuits to ground, U"function"_MIN
recommended to be set to 0.2 V, and short circuits to power supply, U"function"_MAX re-
commended to be set to 4.8 V. Failures are activated after the adjustable debounce time
of diagnosis TD"function". If a sensor error is set, the output is switched to the default
value "function"_DEF.
Pressure measurements
The system offers many different pressure channels, please see function description Input
Signal Processing for details. For gradient and offset information please contact the
sensor manufacturer.
Engine Control Unit MS 25 Sport
Peripherals | 3
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