US 11,722,334 B2
Network communication system with bidirectional current modulation for transmitting data
Marek Lewandowski, Bietigheim-Bissingen (DE)
Appl. No. 17/312,738
Filed by Valeo Schalter und Sensoren GmbH, Bietigheim-Bissingen (DE)
PCT Filed Nov. 18, 2019, PCT No. PCT/EP2019/081575
§ 371(c)(1), (2) Date Jun. 10, 2021,
PCT Pub. No. WO2020/120071, PCT Pub. Date Jun. 18, 2020.
Claims priority of application No. 10 2018 132 024.8 (DE), filed on Dec. 13, 2018.
Prior Publication US 2022/0052873 A1, Feb. 17, 2022
Int. Cl. H04L 12/40 (2006.01); H04L 25/02 (2006.01)
CPC H04L 12/40039 (2013.01) [H04L 25/0266 (2013.01); H04L 2012/40273 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A network communication system for a vehicle, the network communication system comprising:
a communication bus;
a first communication device;
a plurality of second communication devices which are connected to one another via the communication bus; and
a terminating resistor arranged in parallel with the plurality of second communication devices;
wherein the first communication device comprises a bias voltage source for generating a constant bias voltage on the communication bus, and a current measurement apparatus for capturing the current on the communication bus;
wherein the first communication device comprises a first modulation apparatus for modulating a current set by the bias voltage and the terminating resistor on the communication bus;
wherein each second communication device comprises a second modulation apparatus for modulating the current set by the bias voltage and the terminating resistor;
wherein each second communication device has a second voltage measurement apparatus for capturing a voltage at the terminating resistor;
wherein the bias voltage source and the first modulation apparatus are arranged in parallel in the first communication device; and
wherein a diode is connected upstream of the bias voltage source, the diode being configured to block a current from the first modulation apparatus into the bias voltage source.