Jari Kataja

Advanced Driver Aid System for Energy Efficient Electric Bus Operation

Electric bus energy consumption is mainly due to the vehicle traction. Additionally, auxiliary systems such as cabin heating-cooling, air compressor, and power steering consume energy. One way to optimize the consumption is a Driver’s Aid System (DAS). Based on the route information, DAS provides the driver the optimal driving suggestions, and simultaneously may optimise the energy use of auxiliary systems. These approaches are discussed in the paper. When the optimal air compressor operation was introduced, vehicle energy consumption was decreased 1.6 %. In addition to guiding the auxiliary devices and the driver, prospects of using DAS as a communication hub for managing buses, their charging and to share information for a bus operator are discussed.

State-space flux-linkage control of bearingless synchronous reluctance motors

This paper deals with a model-based state-space flux-linkage control of a dual three-phase-winding bearingless synchronous reluctance motor. Analytical tuning rules for the state feedback, integral action, and reference feedforward gains are derived in the continuous-time domain. The proposed method is easy to apply: the desired closed-loop bandwidth together with the estimated magnetic-model of the motor are required. Furthermore, the proposed method automatically takes into account the mutual coupling between the two windings. A simple digital implementation is provided and the robustness of the proposed control method against the system parameter inaccuracies and eccentric rotor positions is analyzed. The proposed controller design is evaluated by means of simulations by keeping in mind the most important aspects related to an experimental evaluation.

Direct discrete-time flux-linkage control of bearingless synchronous reluctance motors

Direct discrete-time design is applied to flux-linkage control of a bearingless synchronous reluctance motor (BSyRM). Continuous-time state-space model of the BSyRM is first converted to its discrete-time counterpart. For the discretized system, a discrete-time full-state feedback controller is designed using the pole-placement method and internal model control approach. Operation of the controller is simulated and robustness against parameter errors is analyzed. Practical realization of the controller with a BSyRM prototype is also discussed.

Advanced digitally adjustable analog feedback control system and its usage in active noise insulation

Feedback control for the active noise cancellation can be done with analog or digital circuitry. Although digital approach is steadily gaining ground, analog control still has its uses. Short control latency is the feature of an analog controller—it has the shortest possible delay. Its drawback is the limited flexibility for adjustable or adaptive solutions. To overcome this, digitally adjustable analog controllers can be used. A potential implementation for such controller uses field programmable analog array (FPAA) technology. With FPAAs both the filter parameters and structure are digitally adjustable, even during the operation. A development environment around the FPAA controller has been devised. It consists of the measurement system, an optimizer that calculates the optimum controller response, programming software, and actual FPAA hardware with its embedded software. The complete system is packaged tightly to a compact form. It can be used for evaluation purposes in acoustics laboratory conditions....