Q-Tronic Engineering
November 22, 2019
BSPD FSG 2019/2020 v0.3
BSPD FSG 2019/2020
v0.3
1
Overview
• Fully compatibile FSG 2020 e Formula Bharat
2020
• 2 input signal 0-5V
• Brake failure detection
• Upper treshold adjustable from 1,7V (it is possible to reduce the lower limit by replacing a
resistor)
• EV e CV Cars
• Auto reset after 10s
• No heating problems
Contents
1 Overview
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2 Description
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3 Technical specification
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4 Pinout
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5 Behaviour
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6 Measures
3
7 Schematic
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8 Board - Parts
3
9 Test board Schematic
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2
Description
• The BSPD has the role of turning off the engine in the event of sudden braking and acceleration of
more than 10% at the same time.
• It compliants the 2019 rules of FSG. The circuit works with active low logic 5V.
• The BRAKE COMPARATOR checks that the pressure in the brake circuit is within an interval (0 = error).
DON NOT USE DIGITAL SENSORS FOR EXAMPLE BRAKE LIGHT SWITCH.
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Q-Tronic Engineering
November 22, 2019
BSPD FSG 2019/2020 v0.3
• The THROTTLE COMPARATOR checks that the throttle is open beyond a minimum threshold but less
than 10% (0 = error).
• The output signals of the two comparators are in NOR (1 = error). The resistor R = 39 kΩ and the
capacitor C = 10 uF operate a time constant of 390 ms.
• The TIME 1 COMPARATOR determines a delay of about 500ms (496ms) in the activation of the system
(0 = error). The resistance R119 = 560 kΩ and the capacitor C = 10uF operate a time constant of 5600ms.
In order to extend the autoreset delay R119 can be replaced with one of bigger value.
• The TIME 2 COMPARATOR determines a delay of about 9900ms after which the BSPD is deactivated
(RESET CONDITION) and the engine can be restarted (0 = error). The NO RELAY performs the coupling
with the car’s powerline.
• Both the brake signal and the accelerator signal are compared with two thresholds, one upper and one
lower.
• Lower threshold: 0.45V set via resistors R102 / R116 (100 kΩ, pull-up) and R112 / R121 (10 kΩ, pulldown).
• Upper threshold: adjustable from 1.7 V to 5 V Set by a potentiometer M64X203KB40 R101 / R115 (2
kΩ to 20 kΩ, pull-up) and a resistor (10 kΩ, pull-down). It needs to do a lot of rotations to change the
voltage divider value. There is no stop at the end of the sweep: when the full range is reached, the
selector can rotate freely. Treshold voltage can be probed on the pin 3 of each potentiometer. If needed
a lower limit under 1.7V, just replace the blue pots with one with bigger value or just solder a resistor
in the two holes nearest to the edge of the PCB, remember you need to remove first the potentiometer
(see the schematic below for any clarification).
• Diodes operate a protection against peaks on all the signals. NB: D101, D102, D104 are symmetric,
don’t need any type of polarization.
• No heating problems, however internal voltage regulator has protection against over-current and overheating.
• Brake failure shutdown: if signal from brake pressure sensor was under 0.45V (ca 0 V) the BSPD turns
off the car. (most brake pressure sensors are in 0.5-4.5V range, if the voltage output is under 0.45 V it
seems that you’ve lost pressure in oil brake system or the cable is disconnected).
• Autoreset disabled when brake pressure sensor is about 5V, this conditions means that you are braking
very hard, it’s obvious that you don’t want to start the car.
• Although in the board is written "BSPD v0.2", don’t worry, the version produced is v0.3 avalaible on the
official site of FSG.
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Technical specification
Unit
Value
Power voltage
V
13.8
Maximum current through SC
A
3
Dimensions
mm ∗ mm ∗ mm 44*36*11 (without cable)
Weight
g
13
Temperature range
C
-20 ÷ 60
n° of inputs
−−
2
Voltage range signal input
V
0÷5
Wire diameter
AW G
22 ÷ 30
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Q-Tronic Engineering
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November 22, 2019
Pinout
Pin
1
2
3
4
5
6
5
Signal
Power 13.8 V
SC_IN (Power line of the car)
SC_OUT (Power line of the car)
S1 (Brake sensor)
S2 (Throttle sensor)
GND
Behaviour
Acceleratie 1.4V -> 3.86 V
Frana trebuie montata de cei de la Mechanical si testat voltajul
6
Measures
7
Schematic
8
Board - Parts
9
Test board Schematic
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BSPD FSG 2019/2020 v0.3
Q-Tronic Engineering
November 22, 2019
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BSPD FSG 2019/2020 v0.3
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November 22, 2019
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BSPD FSG 2019/2020 v0.3
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November 22, 2019
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BSPD FSG 2019/2020 v0.3
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November 22, 2019
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BSPD FSG 2019/2020 v0.3