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In series hybrid drivelines primary power producer produces maj ority of the required traction and auxiliary power.Optimizing the efficiency of the primary power producer helps minimizing the fuel consumption of the whole driveline. In this paper primary power producer is a diesel-generator (Gen-set).Diesel is both, torque and speed controlled. Fuel consumption chart, as a function of diesel speed and torque, is used to find optimal efficiency operating point in regard of system load.Supercapacitor is connected to dc-link via actively controlled dc/dc-converter. This supercapacitor module is controlled to provide residual power and it supports gen-set so that the optimal operating point can be used during all phases of the vehicle operation.Control design is tested using simulation model that has been verified with actual hardware components.Results are presented and analyzed, proving that the concept of optimal efficiency control contributes significantly to reduced fuel consumption.

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Heavy-duty vehicles OEMs have an increasing interest in alternative power train solutions. To gain benefits of hybrid power train, proper power bus control must be implemented. Control strategy refers to means necessary to meet duty cycle power demands while maintaining vehicle performance. Cascading controlling strategy division is proposed. Control method layering proposition is presented and control methods are divided into two categories, reactive and predictive methods. Finally these methods are implemented in series hybrid energy system model. Implemented reactive methods are load-based control, voltage-based control, voltage/load hybrid control and peak shaving control. Load data is measured data from electrical power train straddle carrier. One vehicle state predictive control method is implemented. Results are evaluated and discussed.