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Incorporation of Adaptive Grid-Based Look-Up Tables in Adaptive Feedforward Algorithms for Active Engine Mounts

Active engine mounts make an important contribution to ensure the comfort in vehicles with emission-reducing engine technologies, e.g., cylinder-on-demand (COD). To control active engine mounts either adaptive filtering or map-based feedforward control is commonly employed. This contribution proposes two methods to combine both control strategies in order to overcome their respective disadvantages. Adaptive look-up tables are incorporated into a Multiple-input-multiple-output-Newton/FxLMS adaptive feedforward control algorithm in two ways: as parameter-maps or parallel-maps. The proposed control strategies are experimentally compared in a vehicle with a V8-COD-engine. While both methods significantly reduce the convergence time of the adaptive filter, the parallel implementation additionally improves the tracking behavior during fast engine run-ups.