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Tommi · 06-14-2011, 07:34 AM

""""""...Stationary Engine Starts

To start the engine, MG1 (connected to the sun) is driven forward using electrical power from the high voltage battery, as shown in the animation above. If the car is stationary, the ring gear of the PSD will also be held stationary. The rotation of the sun gear therefore forces the planet carrier to rotate. This is connected to the ICE and turns it over at 1/3.6 of the rotation rate of MG1 (see equation 1 in The Power Split Device).

Whereas a conventional car passes fuel and sparks to the ICE as soon as the starter motor gets it turning, the Prius waits until MG1 gets the ICE up to around 1000 r.p.m. This happens in less than a second. MG1 is much more powerful than an ordinary starter motor. To turn the ICE at this rate, it needs to spin at 3600 r.p.m. itself. Starting the ICE from 1000 r.p.m. puts virtually no strain on it because this is a speed at which the ICE would be happy to run under its own power. In addition, the Prius begins by sparking only a couple of cylinders. The result is a very smooth start up, free from noise and lugging, that eliminates the wear associated with normal car engine starts.

Once the ICE has started to run under its own power, the computer controls the throttle opening to get a suitable idle speed during warmup. Electricity is no longer fed to MG1 and, in fact, if the battery is low MG1 may be used to generate electricity to charge the battery. The animation above illustrates this situation also. The computer merely configures MG1 as a generator instead of as a motor, opens the ICE throttle a bit more and draws off electricity".....

06-14-2011, 07:34 AM	#6748
Tommi Infamous Member How Do You Identify?: Usually "Hello" Relationship Status: Married and Bound to Tommi's kaijira (Ts_kaijira ) Join Date: Nov 2009 Location: Suthun.... California that is. Across the ridge from Laguna Beach. Posts: 8,151 My Photo Gallery Thanks: 13,621 Thanked 21,337 Times in 5,970 Posts Rep Power: 21474860	Stationary engine """"""...Stationary Engine Starts To start the engine, MG1 (connected to the sun) is driven forward using electrical power from the high voltage battery, as shown in the animation above. If the car is stationary, the ring gear of the PSD will also be held stationary. The rotation of the sun gear therefore forces the planet carrier to rotate. This is connected to the ICE and turns it over at 1/3.6 of the rotation rate of MG1 (see equation 1 in The Power Split Device). Whereas a conventional car passes fuel and sparks to the ICE as soon as the starter motor gets it turning, the Prius waits until MG1 gets the ICE up to around 1000 r.p.m. This happens in less than a second. MG1 is much more powerful than an ordinary starter motor. To turn the ICE at this rate, it needs to spin at 3600 r.p.m. itself. Starting the ICE from 1000 r.p.m. puts virtually no strain on it because this is a speed at which the ICE would be happy to run under its own power. In addition, the Prius begins by sparking only a couple of cylinders. The result is a very smooth start up, free from noise and lugging, that eliminates the wear associated with normal car engine starts. Once the ICE has started to run under its own power, the computer controls the throttle opening to get a suitable idle speed during warmup. Electricity is no longer fed to MG1 and, in fact, if the battery is low MG1 may be used to generate electricity to charge the battery. The animation above illustrates this situation also. The computer merely configures MG1 as a generator instead of as a motor, opens the ICE throttle a bit more and draws off electricity".....