Simulation Results

AVL BOOST

Thermodynamic simulations were performed in order to optimise all parameters relevant to the engine’s gas exchange. The code used was AVL BOOST, a state of the art gas exchange and cycle simulation program. AVL BOOST simulates the complete engine cycle including the gas exchange considering the 1D-gas dynamics in the intake and exhaust system.

The target full load characteristics with a maximum torque of 200 Nm available between 2000 and 3500 rpm and a maximum power of 74 kW (100 HP) available between 4000 and 4500 rpm can be reached with a relatively low peak firing pressure of 140 bar.

The full load performance can be reached with very attractive fuel consumption.

AVL BRICKS

The AVL software code BRICKS was used to predict the influences caused by the reduced flywheel mass for the diesel motorcycle engine. The degree of cyclic speed irregularity is an indicator of the running smoothness of the engine. This parameter is defined as follows:

The comfort driven boarder line for a passenger cars shows a maximum value of 0.25 (red dotted line). With the improved motorcycle engine layout it is possible to achieve the same speed irregularity starting at 2000 rpm.

AVL CRUISE

The software AVL CRUISE was used to predict the vehicle performance. CRUISE is developed for vehicle simulation. The most typical tasks are the calculation of driving performance, fuel consumption, and emissions.

The CRUISE model contains the components as in the real vehicle with all relevant inputs simulated.

The engine component includes the engine performance curve from the BOOST calculation.

The results in the different tasks performed in the vehicle simulation were compared to the Benchmark vehicles (Big displacement Naked Bikes).

Acceleration time 0 - 100 [km/h]

Acceleration time 60 - 100 [km/h]

Acceleration time 100 - 140 [km/h]

RESULTS EMISSION

The predicted minimum require-ments for the exhaust after-treatment system to comply with the future emission limits for the diesel motorcycle are:

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