|Testing the Chevy 350 Engine|
Research equipment to test the Chevy 350 engine include an engine test cell and engine dynamometer, flow rate measurement bench, chassis dynamometer, continuous emissions monitoring equipment, cold start test facility, and various additional equipment.
One can test the Chevy 350 engine with a dual air-injection system to minimize cold start emissions and rapidly heat the exhaust catalysts. One can place ethanol-specific light-off and main catalysts in the exhaust system. The fuel injector testing is performed to minimize potential cylinder-to-cylinder fueling variations. To ensure the compatibility of the engine to the fuel system and considering the nature of ethanol, the fuel system must be kept free of any aluminum components. By introducing the air injection system in the exhaust, the excess CO and HC emissions are rapidly oxidized on cold start.
The engine start up time can be measured under simulated cold start conditions. By taking in cylinder pressure and temperature measurements this method allows the automation of the cold start facility. A data acquisition card connected to a computer allows for the collection of data. The engine can be placed inside the cold start facility where it is possible to reduce the temperature to as low as -4?F (-20?C). Pressure measurements are obtained by placing a measuring spark plug with integrated cylinder pressure sensor. Every time the engine is tested, in order to achieve consistency as far as the data measurements are concerned, the engine needs to be placed at the same crank angle before every test. The pressure sensor emits signals which are first sent to an amplifier and later to the data acquisition card. Thermocouples are used to measure exhaust gas, ambient, and oil temperatures.
To conduct a cold start test, set crank angle to a pre-set position. There is an indicator on the engine which resets to the same angle before every test. Since cold tests are preferred, the temperature in the cold start facility has to be set between -4?F to +32?F (-20?C to 0?C). Once the engine and all of its components is cooled to a uniform temperature, switch the power and fuel pump on the control panel and prepare for crank. Push the starter button and release it once the engine is running. Determine the time measurement to determine the engine start time.
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