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Hardware Features

18

The meaning of these bits is described in the following table.

Tab. 2-1

Meaning of the Nine Protocol Bits

Bit Number Meaning

Coding

0

Error bit air gap limit

0 = correct
1 = air gap limit

1

Can be assigned freely

2

Can be assigned freely

3

Validity of direction of rota-
tion

0 = valid
1 = invalid

4

Direction of rotation

0 = positive
1 = negative

5

Can be assigned freely

6

Can be assigned freely

7

Can be assigned freely

8

Parity bit

Is set to 0 or 1 to retain even
parity (incl. the parity bit itself).

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Summary of Contents for ES1337.2

Page 1: ...ES1337 2 Wheel Speed Sensor Simulation Board User s Guide ...

Page 2: ...ent or single license Using and copying is only allowed in concurrence with the specifications stipulated in the contract Under no circumstances may any part of this document be copied repro duced transmitted stored in a retrieval system or translated into another language without the express written permission of ETAS GmbH Copyright 2018 ETAS GmbH Stuttgart The names and designations used in this...

Page 3: ...Wheel Speed Sensors 11 2 1 1 Type DF6 12 2 1 2 Type DF10 13 2 1 3 Type DF10 RotDir 14 2 1 4 Type DF11i 15 2 1 5 Type VDA 17 2 2 Analog Outputs 19 2 2 1 Reference Voltages 19 2 2 2 Type of Output Signal 19 2 2 3 Disabling the Output 19 2 3 Synchronization Signal 19 3 Pin Assignment and Display Elements 21 3 1 Pin Assignment 21 3 1 1 OUTPUT 0 5 Signal Outputs 21 ...

Page 4: ...Contents 4 3 1 2 SYNC Port 22 3 2 LEDs 23 4 Technical Data 25 5 ETAS Contact Addresses 27 Index 29 ...

Page 5: ...active design with an external power supply of the sensor element The designs also differ in terms of the physical effect on which the acquisition of the wheel speeds is based and the scope and content of the information provided by the sensor CAUTION Some components of the ES1337 2 Signal Generator Board may be damaged or even destroyed by static discharge Leave the board in its transport package...

Page 6: ...other galvanically isolated analog voltage outputs The ES1337 2 Signal Generator Board has the following features Four identical galvanically isolated signal generators for generating speed signals Outputs 10 V and 0 40 mA with 10 bit resolution Two identical galvanically isolated analog outputs 10 V with 10 bit resolution Configurable reference voltages internal external Every channel is protecte...

Page 7: ...Introduction 7 Fig 1 1 Front View of the ES1337 2 Signal Generator Board ES1337 1 ETAS L0 ER L1 SYNC OUTPUT 0 5 ...

Page 8: ...gnal Generator Board Fig 1 2 Block Diagram of the ES1337 2 Signal Generator Board FPGA Controller Output 0 5 VMEbus Interface Output Multiplexer Analog Outputs Wheel Speed Signal Generator 0 3 Rotational Speed Generator Control Register SYNC Output 0 3 Output Protection Current Interface Output 4 5 Output Protection ...

Page 9: ... saving way represent ing no danger to health or the environment Fig 1 3 WEEE Symbol The WEEE symbol on the product or its packaging shows that the product must not be disposed of as residual garbage The user is obliged to collect the old devices separately and return them to the WEEE take back system for recycling The WEEE directive concerns all ETAS devices but not external cables or batter ies ...

Page 10: ...Introduction 10 ...

Page 11: ...page 15 Type VDA on page 17 A basic distinction is made between two processes for recording wheel speeds passive and active sensors With passive sensors there is usually an encoder wheel made of ferromagnetic material which closely runs past a magnet surrounded by a coil This results in a constant change of the magnetic flux density which induces a voltage in the coil Active sensors often use an e...

Page 12: ... coil which is routed to the correspond ing ECU The resulting sensor signal approximates the form of a sinusoidal signal see Fig 2 1 Fig 2 1 Signal of a Passive DF6 Sensor Every tooth generates a period of the sinusoidal oscillations the signal ampli tude depends on the size of the gap between the individual teeth the air gap and the speed The greater the speed and the smaller the gap the greater ...

Page 13: ...e actual sensor element magnetoresistance sensors consists of a permanent magnet and a two wire connection for the power supply battery voltage and the sensor signal This sensor is then positioned on the gear wheel so that there are changes in the resistance due to changes in the flux density between the tooth and the gap The post connected evaluation unit then returns defined currents of 7 mA gap...

Page 14: ...l vmin the current Iidle 7 mA is output The currents in forward movement and reverse movement are shown in Fig 2 3 Fig 2 3 Output Signals of a DF10 RotDir Sensor A reverse movement is shown when the sensor outputs a current Ireverse 28 mA for a short time treverse Iforward treverse Iidle Ireverse Forward Rotation Reverse Rotation Iidle Ireverse 28 mA Iforward 14 mA Iidle 7 mA Iforward Gear Wheel ...

Page 15: ... precise temporal relationship to the change of the seg ments The pulse width is determined by the direction of rotation and the field strength It consists of multiples of a well defined time interval When the encoder wheel is paused or there is no change to the sensor signal for another reason a standstill pulse with approx 1 5 Hz repetition rate is out put Fig 2 4 on page 16 shows the various ou...

Page 16: ...strength Air gap limit error Backward drive normal field strength Forward drive normal field strength Backward drive low field strength mounting position error Forward drive low field strength mounting position error T0 2T0 4T0 8T0 16T0 32T0 737 ms T0 45 µs No field or vehicle stopped for 737 ms No Field or Vehicle Stopped 7 mA 14 mA 7 mA 14 mA Vehicle Movement 7 mA 14 mA 7 mA 14 mA 7 mA 14 mA 7 m...

Page 17: ...ig 2 5 Speed Pulse and Data Bits The speed pulse is output at every edge of the encoder wheel the current IH of this pulse is four times the low level IL 7 mA An initial bit that sets the current level to IL precedes this pulse A further nine bits follow the speed pulse with a current level of IH 2 IL IL 7 mA IM 2 IL IH 4 IL 0 2 3 1 4 5 6 7 8 Data Protocol Bits Speed Pulse Initial Bit N S ...

Page 18: ...Error bit air gap limit 0 correct 1 air gap limit 1 Can be assigned freely 2 Can be assigned freely 3 Validity of direction of rota tion 0 valid 1 invalid 4 Direction of rotation 0 positive 1 negative 5 Can be assigned freely 6 Can be assigned freely 7 Can be assigned freely 8 Parity bit Is set to 0 or 1 to retain even parity incl the parity bit itself ...

Page 19: ...nfiguration The reference voltage is selected in the Globals tab of the ES1337 Wheelsn srsim DA Device Analog Reference Output 4 5 option in LABCAR RTC 2 2 2 Type of Output Signal The digital signal is derived from the analog signal the comparator threshold corresponds to 1 V when using the internal reference or 0 1 x Vext when using the external reference Selection takes place in the Globals tab ...

Page 20: ...Hardware Features 20 ...

Page 21: ... the meaning of the LED displays on the front panel 3 1 Pin Assignment This section describes the pin assignment of the connectors for the output signals and the synchronisation signals OUTPUT 0 5 Signal Outputs on page 21 SYNC Port on page 22 3 1 1 OUTPUT 0 5 Signal Outputs The four outputs of the wheel speed generators are at this port the two ana log outputs as well as the analog grounds of all...

Page 22: ...und 3 Channel 1 Output FR 16 Channel 1 Analog Ground 4 n c 17 Channel 1 Analog Ground 5 Channel 2 Output RL 18 Channel 2 Analog Ground 6 n c 19 Channel 2 Analog Ground 7 Channel 3 Output RR 20 Channel 3 Analog Ground 8 n c 21 Channel 3 Analog Ground 9 Channel 4 Output 22 Channel 4 Analog Ground 10 Channel 4 External Reference 23 Channel 4 Analog Ground 11 Channel 5 Output 24 Channel 5 Analog Groun...

Page 23: ... on briefly when the ES1337 2 is reset LED Display Meaning ER LED shows red Error e g unsuccessful attempt to access ROM memory inconsistent or damaged ROM memory data checksum verification resulted in an error initialization of the RS232 interface did not work calibration data stored in the ROM for the DA channels is incorrect or implausible L0 LED flashes green 1 Hz flashing frequency indicates ...

Page 24: ...Pin Assignment and Display Elements 24 ...

Page 25: ...ctrical strength 60 V Galvanic isolation Yes External reference voltage 10 V 10 V Output voltage 10 V 10 V internal reference Vext to Vext external reference Accuracy With internal reference 10 Bit 50 mV Output current 30 mA Electrical strength 60 V Galvanic isolation Yes Current consumption 10 mA 5 V DC 160 mA 12 V DC 160 mA 12 V DC 700 mA 3 3 V DC Operating temperature 5 C to 35 C 41 F to 95 F R...

Page 26: ...Technical Data 26 ...

Page 27: ...your local sales office as well as your local technical support team and product hotlines take a look at the ETAS website Borsigstraße 24 Phone 49 711 3423 0 70469 Stuttgart Fax 49 711 3423 2106 Germany WWW www etas com ETAS subsidiaries WWW www etas com en contact php ETAS technical support WWW www etas com en hotlines php ...

Page 28: ...ETAS Contact Addresses 28 ...

Page 29: ... E ETAS Contact Addresses 27 F Features 5 Front view 7 L LEDs 23 P Pin assignment 21 SYNC 22 Analog Out 21 signal outputs 21 Product Back 9 R Recycling 9 T Technical data 25 V VDA 17 W Waste Electrical and Electronic Equipment 9 WEEE take back system 9 Wheel speed sensors 11 ...

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