Two-channel method for continuously determining at least one output signal from changing input signals
There is described a two-channel method for determining at least one output signal from variable input signals sent by a transmitter, using two independent channels and consisting in alternately guiding the input signals to said channels, wherein a multiplexer is used for switching said channels. A microprocessor contained in said channels delivers input test signals transmitted to the channel not currently receiving any variable input signal. Said channel transmits output signals compared with an expected value in order to verify the channel correct operation. Simultaneously, the other channel produces an output signal. Afterwards, the multiplexer switches a control signal.
1. A method for continuously determining at least one output signal based on changing input signals, comprising:
providing a chip with a first channel and a second channel, the first channel having a first microprocessor and the second channel having a second microprocessor;
feeding the input signals to the first channel, the input signals being provided by a transmitter;
producing an output signal based on the input signals and taking the output signal from the first channel;
feeding test input signals to the second channel, an expected value being known for a test output signal, the test input signals being generated by the first microprocessor;
determining the test output signal based on the test input signals; and
comparing the test output signal with the expected value to check whether the second channel is operating correctly.
2. The method as claimed in claim 1 , wherein the input signals and the test input signals are fed in alternation simultaneously to the first and second channel, the first and second channel being mutually independent and the input signals being identically processed in the first and second channel for producing the output signal.
3. The method as claimed in claim 1 , wherein the input signals are signals from a magnetic transmitter system or an optical transmitter system.
4. The method as claimed in claim 3 , wherein the transmitter system is associated with a component of a machine, and wherein the output signal indicates an actual position value of the machine's component.
5. The method as claimed in claim 3 , wherein the input signals have a sinusoidal value and a cosinusoidal value.
6. The method as claimed in claim 5 , wherein a signal processing includes counting zero crossings of curves and determining a tangential arc in terms of the ratio of the two input signals.
7. The method as claimed in claim 1 , wherein an error signal or stop signal is fed out when the output signal does not tally within tolerance limits with the expected value.
8. The method as claimed in claim 1 , wherein the input signals are analog signals of sensors.
9. An integrated circuit, comprising:
a first channel for producing at least one output signal based on changing input signals;
a second channel identical to the first channel, likewise for producing the output signal based on the changing input signals, employed in alternation with the first channel;
a multiplexer for changing over between the first channel and the second channel;
a microprocessor configured to generate test input signals; and
a data link from the microprocessor to the multiplexer for feeding the test input signals in an alternating manner to in each case the channel currently not being used for producing the output signal.
10. The integrated circuit as claimed in claim 9 , wherein the first channel and the second channel have an analog-to-digital converter and a digital part being configured as a digital evaluation circuit.
11. The integrated circuit as claimed in claim 9 , wherein the first channel and the second channel have an analog-to-digital converter and a microprocessor.
12. The integrated circuit as claimed in claim 11 , wherein the microprocessor controls the multiplexer based upon a changeover signal.
13. The integrated circuit as claimed in claim 9 , wherein the data link has a digital-to-analog converter.
14. The integrated circuit as claimed in claim 9 , wherein the microprocessor is located in one of the channels.
15. The integrated circuit as claimed in claim 9 , wherein the input signals fed to the channels have reverse polarity.
16. The integrated circuit as claimed in claim 9 , wherein the integrated circuit is connected to a transmitter system attached to a component of a machine, and wherein the output signal is based upon a sinusoidal input signal and a cosinusoidal input signal.
17. The integrated circuit as claimed in claim 16 , wherein the transmitter system is a magnetic transmitter system.
18. The integrated circuit as claimed in claim 16 , wherein the transmitter system is an optical transmitter system.
19. The integrated circuit as claimed in claim 16 , wherein the output signal is used by an electronic position controller for the component of the machine.