Online identification and compensation of the force estimating error in sensor-less bilateral control system

To solve the problem of force estimating error in reaction force observer based sensor-less bilateral control, the online identification and compensation method is proposed based on the recursive least squares algorithm with discontinuous projection mapping. The proposal can identify the system parameters in a fixed bounded range, which guarantees that good performance of the system are not influenced by the compensation. Besides, the force estimating error caused by the parameters mismatch can be canceled. According to experimental results, validity of the proposal is confirmed.