Wheel electronics and tire control system for measuring a measurand
View Patent ↗Wheel Electronics and Tire Control System for Measuring a Measurand is provided. The wheel electronics may include a receiving device for picking up and digitizing an amplitude-modulated request signal, which has a carrier frequency for encoding a request, having a first evaluation device, which checks the request signal for the presence of a request contained therein, and having a digital counter for generating an envelope of the request signal, which has a counter input for coupling the request signal, which is clocked at a clock signal frequency different from the carrier frequency and is determined from the clock signal frequency and the request signal of its envelope. Furthermore, the invention relates to a tire control system for measuring a measurand with this type of wheel electronics.
1. A wheel electronic for a tire control system of a vehicle for measuring a measurand, the wheel electronic comprising:
a transmitting/receiving device for receiving at least an amplitude-modulated request signal; and
an evaluation device for decoding the request signal and for generating an envelope signal from the decoded request signal, the evaluation device comprising:
a counter that has an input for receiving the request signal;
a shift register for receiving an output from the counter, the shift register having a plurality of register stages; and
a logic circuit for receiving an input from at least one register stage of the shift register and for providing an output representing a decoded value of the request signal provided to the transmitting/receiving device.
2. The wheel electronic according to claim 1 , wherein the counter is a Gray counter.
3. The wheel electronic according to claim 1 , wherein the counter is a 3-bit counter.
4. The wheel electronic according to claim 1 , wherein each register stage of the shift register has a plurality of flip flops, and wherein each output of the counter is connected with an input of each of the flip flops.
5. The wheel electronic according to claim 1 , wherein the shift register is a multistage shift register and has a plurality of shift register stages arranged in series to one another.
6. The wheel electronic according to claim 1 , wherein the shift register has five register stages, each of the register stages having an output to thereby provide a value to the logic circuit.
7. The wheel electronic according to claim 1 , wherein a clock signal of the shift register has a different frequency than a carrier frequency of the request signal.
8. The wheel electronic according to claim 1 , wherein at least one of the register stages of the shift register is connected to the logic circuit and wherein the logic circuit at an output terminal outputs a first logic level, when substantially all shift register stages have the same output value, and which outputs a second logic level, when the output values of the shift register steps are different.
9. The wheel electronic according to claim 7 , wherein an output of the logic circuit has the same clock frequency as the clock signal of the shift register.
10. The wheel electronic according to claim 1 , wherein a flip-flop or a D flip-flop, is provided, whose data input is connected to an output terminal of the logic circuit.
11. The wheel electronic according to claim 1 , further comprising a power supply for providing the wheel electronic with power.
12. The wheel electronic according to claim 1 , further comprising a pressure sensor for measuring a pressure value of a vehicle wheel.
13. The wheel electronic according to claim 1 , wherein the output representing a decoded value of the request signal is used to switch a pressure sensor from an off state to an on state.