Influence of modern diesel cold start systems on the cold start, warm ...

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<strong>Influence</strong> <strong>of</strong> <strong>modern</strong> <strong>diesel</strong> <strong>cold</strong> <strong>start</strong> <strong>systems</strong> on the <strong>cold</strong> <strong>start</strong>, warm-up and emissions <strong>of</strong> <strong>diesel</strong> engines HC Emissions [%] 120 100 80 60 40 20 0 -30 -25 -20 -15 -10 -5 0 5 Cold Start Temperature [°C] 18 Metal Glow Plug Ceramic Glow Plug Fig. 5-6 Change <strong>of</strong> emissions with different glow plug temperatures <strong>of</strong> the V-angle engine 5.2.4 Cylinder pressure signal Standard Deviation <strong>of</strong> Indicated Mean Effective Pressure [-] 3,0 2,5 2,0 1,5 1,0 0,5 0,0 Metal Glow Plug Ceramic Glow Plug -25 -10 Cold Start Temperature [°C] 0 Fig. 5-7 Change <strong>of</strong> the standard deviation <strong>of</strong> indicated mean effective pressure with different glow plug temperatures <strong>of</strong> the inline engine
<strong>Influence</strong> <strong>of</strong> <strong>modern</strong> <strong>diesel</strong> <strong>cold</strong> <strong>start</strong> <strong>systems</strong> on the <strong>cold</strong> <strong>start</strong>, warm-up and emissions <strong>of</strong> <strong>diesel</strong> engines Figure 5-7 shows the calculated standard deviation <strong>of</strong> the indicated mean effective pressure during the different <strong>cold</strong> <strong>start</strong>s <strong>of</strong> the inline engine. The standard deviation is calculated over the total duration <strong>of</strong> the <strong>cold</strong> <strong>start</strong>. During all these <strong>start</strong>s with a ceramic glow plug the engine run is slightly more stable than with a metal glow plug. [10] 5.3 Effect <strong>of</strong> the intake air heater The intake air heater is placed behind the air intercooler. During tests with the V-angle engine the IAH was powered from the vehicle electrical system. Due to the power consumption <strong>of</strong> the IAH a battery voltage drop <strong>of</strong> about 1 Volt can be recognized during IAH operation (see figure 5-8). During tests with the inline engine the IAH was supplied by an external power supply to eliminate this influence on the electrical system. By this it was possible to individually evaluate the effect <strong>of</strong> the intake air temperature increase. Fig. 5-8 Battery voltage behavior with and without IAH (-25°C) <strong>of</strong> the V-angle engine 5.3.1 Starting time The <strong>start</strong>ing times were longer with an intake air heater. (Fig 5-9) This could be explained with the lower vehicle electric system power if the heater is switched on. For that reason the <strong>start</strong>er does not get enough power and the <strong>start</strong>er speed decreases. 19
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