LD Didactic Sensor Panel 2 User manual

LD DIDACTIC GMBH •Leyboldstrasse 1 •D-50354 Hürth •Phone [phone] •Fax [phone] •E-Mail: [e-mail]
© by LD Didactic GmbH Printed in the Federal Republic of Germany
Technical alterations reserved
02/18-W2013-Wei
Instruction Manual 739 708
Sensor Panel 2
1Connections Plus Terminal 30 and Terminal 15
2Slot for CAN Terminating Resistance STE
120 Ω
3Connections and Fuses
4Connection Socket CAN H and CAN L
5Display for a Lack of Short-circuit to Ground
6Sensitivity Adjustment and Output Signal for
the Knocking Sensor with Display
7Short-circuit to ground Terminal 31
8Sensor for Low Pressure
9Sensor for Accelerator Position
10 Sensor for the Neutral Position of the Transmis-
sion
11 Sensor for Brake Pedal
12 Connection for Knocking Sensor
1 Description
This device is used to examine the operation of various
analog and digital sensors.
The device is equipped with original sensors for monitoring
the differential pressure of a DPF as well as for detecting
the position of the accelerator pedal, the neutral position
of the transmission, and the brake pedal. The knocking
sensor 739 03 can also be connected to it. The device is
intended for use in educational institutions. Use in a real
vehicle (including use of individual components) is not per-
mitted.
Safety Note
2 Scope of the delivery
Sensor panel 2, 739 708
Not included, but recommended accessory equipment:
•Set of 10 magnets 689 0815
•CAN-Databus-Multi-Adapter 773 961
•Knocking sensor 739 03
•PVC tubing, 7 mm diam., 1 m 667 193
•Hand vacuum pump 375 58
•Automotive fault simulator 738 491
•Connecting leads, set of 7 739 195
-The device is appropriate for interior use only!
-Use only safety bridging plugs and safety connec-
tion leads!
-Be careful not to short-circuit the power supply.
Fire hazard!
-The device should only be used for training pur-
poses. Installation in an actual vehicle is prohib-
ited!
7 8 9 10 11 12
4
3
1
2
6
5

User manual Page 2/4
LD DIDACTIC GMBH .Leyboldstrasse 1 .D-50354 Huerth .Phone [phone] .web: www.ld-didactic.com .e-mail: [e-mail]
by LD Didactic GmbH Printed in the Federal Republic of Germany
Technical alterations reserved
3 Technical data
Supply voltage: U = 12 V=
differential pressure indicator
Supply voltage: U = 5 V=
Interface: SENT (3 µs) acc. to SAE J2716
Pressure range: 0-125 kPa
SENT channels: FDC with pause, slow channel
SENT signals: 1*12 bit, single secure
Accelerator position transducer
Supply voltage: U = 12 V=
Interface, pedal sensor: SENT (3 µs) acc. to SAE J2716
Sensitivity: 3 mT
SENT channels: FDC without pause, slow ch.
SENT signals: 1*12 bit
Neutral gear position transducer
Interface: PWM
Supply voltage: U = 5 V=
Low level: UL< 1 V
High level: UH> 4 V
Frequency: fd= 125 Hz
Pull-up resistor R = 1 kΩ
Brake light/pedal switch
Interface, brake pedal: Digital
Interface, brake light: Digital
High level: UH= 12 V
Knock sensor amplifier
Input filter: fg= 1.6 kHz
High level: UH= 7 V
Pulse width: tkn = 400 ms
4 Setup and Functional Checks
Connect the device to the power supply at Terminals
15 and 30 (1) and the ground (7).
Insert the 4-mm safety bridging plugs into the socket
(3) above the control unit as well as in all socket pairs
below the control unit.
Insert a bridging plug into position 2to activate the
CAN terminating resistor.
Turn on the supply voltage and the ignition.
5 Functional description
Differential Pressure Indicator (8)
Based on the measured differential pressure be-
tween Filter Outlet (P1) and Filter Inlet (P2), the
pressure sensor determines the actual exhaust
flow through the diesel particulate filter and thus
the degree of clogging of the filter. This value is
transmitted via a SENT interface to the engine
control unit. If the determined value exceeds a
limit stored in the control unit, a regeneration pro-
cess is initiated to burn the residues present in the
particulate filter.
Accelerator Pedal Position Indicator (9)
The detection of the accelerator pedal position
takes place with a Hall-effect linear sensor, type
HAL283 with a SENT interface. Thus, voltage is
generated proportional to the magnetic flux
through the Hall element.
Indicator for Neutral Position of Transmission (10)
This is an active distance sensor based on the Hall
effect with a PWM interface. The sensor reacts to
magnetic field changes by changing the Hall volt-
age. Under the influence of a magnetic field or a
ferromagnetic material, the sensor generates a
pulse width modulated signal, in whose duty cycle
the distance as well as the polarity of the magnetic
field is coded. A small depression on the magnet
holder marks the north pole.

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Brake Light / Brake Pedal Switch (11)
Contactless, combination brake light / brake pedal
switch based on the Hall effect, which generates
a digital signal for the actuation of the brake light,
and a corresponding inverted signal for analyzing
the brake pedal position. The sensor is sensitive
to polarity.
Optional: Knocking Sensor (12)
The signal from the knocking sensor is filtered in
order to suppress electrical noise. The sensitivity
can be adjusted at Potentiometer 6, for which a
knocking signal is detected. This is then visually
displayed and outputted as a pulse of approx.
400 ms in width and 7 V in amplitude at 4-mm out-
put.
CAN bus
Differential pressure sensor G505:
The sensor signals are mirrored internally on the CAN bus.
The following signals are sent:
CAN-ID Length Position Signal
100 8
Bytes 2-4, all bits
(byte 2 = nibble 0,
byte 3 = nibble 1,
byte 4 = nibble 2)
Differential pressure
Conversion:
p = -(x-800)/3 [mbar]
where x = nibble 0 to
2)
101
7
Enhanced Message
102 4 Short Message
200 2 Byte 1, bits 0-15 Distance
300 1 Byte 1, bit 0 Brake light
Note:
Numbering system of bytes: 1 (left) to 8 (right)
Numbering system of bits: 0 (right) to 7 (left)
Example of converting the differential pressure:
CAN message $100: 0D 06 09 0F 03 01 09 04
p= -(69Fh – 800)/3 = -(1695-800)/3 = -298 mbar

User manual Page 4/4
LD DIDACTIC GMBH .Leyboldstrasse 1 .D-50354 Huerth .Phone [phone] .web: www.ld-didactic.com .e-mail: [e-mail]
by LD Didactic GmbH Printed in the Federal Republic of Germany
Technical alterations reserved
Accelerator pedal sensor G79:
The sensor signals are internallymirrored on the CAN bus.
The following signals are transmitted:
CAN-ID Length Position Signal
100 5 Bytes 3+4, bits 0-7
accelerator pedal
position
102 4 Short Message
200 2 Byte 1, bits 0-15 Distance
300 1 Byte 1, bit 0 Brake light
Hint:
Counting of bytes: 1 (left) to 8 (right)
Counting of bits: 0 (left) to 7 (right)
Example for converting the pedal value:
CAN message $100: 0D 00 06 09 04
α= (69h-75)/4 = -(105-75)/4 = 7.5°
Indicator light "CAN ACTIVE"
The control unit is equipped with two LEDs that indicate
the current operating status. The red LED is on continu-
ously during normal operation. The green LED blinks for
each CAN output, regardless of whether SENT messages,
analog values, or digital values are outputted.
6 Fault Switch Connection
On the back, there is a 7-pin socket to connect an
automotive fault simulator 738 491 using a 7-pin
connection cable, which is included in 739 195. This fault
switch can be used to apply faults to the following signals:
Contact Y1 G505, signal SENT 1
Contact Y2 F+F63, Signal T 54
Contact Y3 G701, signal PWM
Contact Y4 F+F63, signal 0/I
Contact Y5 G79+G185, signal SENT 2-1
Contact Y6 G61, signal knock sensor (13)
Select the corresponding channel Y1-Y6 on the fault
simulator by pressing the "Fault channel" buttons,

or

. Then select the fault to be switched by pressing the
"fault code" buttons,

or

.
The following faults are recommended:
#4 Short circuit to ground
#6 Short circuit 500 Ω to T 30
#7 Short circuit 500 Ω to ground
To activate the fault, press the "SET" button; to deactivate
it, press the "RESET" button. For additional details about
the automotive fault simulator 738 491, refer to the
instructions for use.
7 Disposal
Electric and electronic products must not be
disposed of in household waste. Dispose of
the unusable products in accordance with
the applicable legal regulations.