For årtier siden var de kritiske elektroniske komponenter i en racerbil typisk tændspoler, benzindyser og andre elektriske forbrugere. Racerbiler har med tiden fået flere avancerede systemer, såsom ABS/ESP systemer, paddle shift, datalogger, radioer, elektriske pumper, blæsere og lys. Alle komponenter skal styres i det rigtige øjeblik, og alle komponenter kræver kredsløbsbeskyttelse for at forhindre skader eller brand.
EMU Power Management Unit (PMU)
Decades ago, the critical electronic components in a race car were the ignition coil and points. Race cars now feature advanced engine management systems, antilock brake systems, paddle shifters, dataloggers, radios, electric pumps, fans, and lights. All components need to be controlled at the correct moment, and all components require circuit protection to prevent damage or fire.
Traditionally, fuses and relays served all of those purposes, but they have many disadvantages like complicated wiring looms, sensitivity to vibration/temperature, and difficult diagnostics.
All of these problems can be solved by using intelligent power management units (PMUs). Our newly developed PMU unit is at the forefront of technology. It provides 16 high current outputs (and use of multiple units if more outputs are required).
One of the main advantages of the PMU is continuous current sensing and self-resetting functionality if current exceeds the defined level. All output state, voltage and current information can be logged and transmitted via CAN bus to dash displays to inform drivers of potential problems.
An additional advantage of the PMU system is the ability to define logic for controlling outputs. This is done with data from analogue input channels or CAN bus data, and math operations can be defined for each channel. The PMU is also equipped with LED indicators to show the status of each output.
With use of CAN bus keypads or steering wheel switches, all wiring is vastly simplified and lightened.
Two unique features are the inbuilt accelerometer and gyro for logging and “inertia switch” in case of accident.
PMU is assembled according to IPC-S-815A standards to ensure product reliability. The device is manufactured on an automated assembly line with optical inspection, and automated testing (including burn-in). The PCB material and design, special surface coating and IP65 enclosure ensure reliability even in the harshest environments. Carefully selected components allow for continuous and reliable operation across a very wide temperature range (AECQ-100 GRADE 1 (-40 to +125˚C).
Temperature rangeAECQ100 GRADE1 (-40 to +125˚C)
CPU32 bits automotive, 90MIPS
Reverse polarity protectionYes, internal
Operating voltage6-22V, immunity to transients according to ISO 7637
EnclosureIP 65, bespoke CNC machined aluminum
Size (mm) and weight(g)131x112x32.5, 345g
Connectors1 x 39 Automotive connector,
1 x M6 stud for battery connection
PC communicationCAN (ECUMASTER USBtoCAN, PEAK CAN, KVASER)
High current outputs10 x 25A(cont.), 6 x 15A(cont.) with Overcurrent and overheating protection. Outputs may be paired to increase continuous current capability. Current and voltage is measured for each output
Total current output150A continuous
Output current control step100mA
Wipers outputDedicated output with wiper braking feature
+5VMonitored 5V, 500mA output for powering external sensors.
Analog inputs16 inputs, 10 Bit resolution, 0-5V (protected), with software selectable 10K Ohm pullup and pulldowns
CAN Keypads2 x Ecumaster keypads (4, 8, 12 keys)
Output state indication16 bicolor LEDs
Accelerometer/Gyroscope3D accelerometer with 3D gyroscope for logging and crash detection
Real time clockYes, super capacitor for backup power (up to 3 days)
CAN interface2 x CAN2B
CAN standard2.0B 125, 250, 500, 1000 kbps
Input/output streamUser defined with bit masking
up to 48 input messages
Logging memory256 Mbytes
Logging speedVariable, defined per channel, up to 500Hz
Logical operatorsAND, OR, NOT, XOR, >, <, =, >=, <=, !=, isTrue, isFalse, Toggle, Flash, Pulse
Number of functions100
Number of operations250
Special functionsWipers, blinkers