The concept of the engine Prince was born as a result of the alliance between two groups of carmakers, BMW Group and PSA Peugeot Citroën. The cooperation project to develop this product focused on bringing to market a range of petrol engines and small displacement technology.
Since 2007, the Prince engine holds the annual awards for the best engine in its class, in the “International Engine of the Year”. The manufacturing engine BMW-PSA is considered the best of those between 1,400 and 1,800 cm ³ displacement. Its main features are a progressive torque curve, significant reductions in consumption, low mechanical friction and high performance, all achieved through interesting technological innovations incorporated therein.
The atmosphere consists of a 4-cylinder engine of 1,400 cm ³, double tree, overhead camshafts and 16 valves. Indirect injection system Motronic and VVT variable valve timing system and Valvetronic variable valve elevation. Version supercharged has a engine 1600 cc, double overhead cam head supercharged by a turbocharger Twin-scroll and variable valve timing type intake valves and oil pump variable flow and heat exchanger oil / water type.
Initially, this cooperation was to fulfill the commitment voluntarily undertaken by European manufacturers (ACEA) to reduce the fuel consumption of its engines, and also reduce emissions of CO 2. Regarding its architecture, the intake camshaft and exhaust mounts one variable valve timing for phase shifters , which allow varying the time of distribution in these stages , depending on the engine load. On the supercharged version, but variable valve is mounted on the intake camshaft.
Version air system includes a variable stroke of the intake valves. This system replaces the throttle, optimizing the filling of cylinders for greater air resistance which means this and while reducing fuel consumption with the engine at idle and low revs.
The engine intake air are equipped with indirect injection, whereas the system embodying supercharging incorporate direct injection. Through technologies such as oil pump driven flow and demand water pump, fuel savings and emissions compared to other engines are offered, because efforts must support the engine operating in certain limited situations.
A thermostat driven by the engine control unit is responsible for determining the time of opening, that depending on the operation of the engine, it will advance to a more favorable temperature for the combustion engine and friction is reached. This system helps to economise on fuel consumption and emissions.
The use of a twin-turbocharger scroll type provides a constant torque curve for much of the engine speed range, thanks to double gas inlet pipe to the turbine. The engine management is provided by an ME D and ME 17.4 V 17.4, the Bosch brand. The injection of gas is directly or indirectly depending on the version type, and in both cases through solenoid injectors.
The following tables show the relationship of Prince models equipped engines for Citroen, Peugeot, BMW and Mini brands. Recently, two groups have agreed to jointly develop the next generation of gasoline four-cylinder, in accordance with the standard pollution control EURO 6, which will be implemented from 2014.