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Non-linear low pass filtering device for friction force estimator in proportional-integral controller of e.g. exhaust gas recirculation valve, has non-linear branches provided with non-linear and gain modules, which are arranged in series
Non-linear low pass filtering device for friction force estimator in proportional-integral controller of e.g. exhaust gas recirculation valve, has non-linear branches provided with non-linear and gain modules, which are arranged in series
The device has unity gain return branches connected between outputs of integrator modules (G1, G2) and inputs of subtractor modules (3, 1) in the direction of a signal, respectively, and two non-linear branches placed in parallel with respect to a processing branch. The processing branch produces an output signal (s). The non-linear branches are provided with non-linear modules (NL1, NL2) and constant gain modules (K1, K3), where the non-linear and gain modules are arranged in series. An independent claim is also included for a friction force estimator comprising a low pass filtering device.
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