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texnologiyalaridan foydalanish» mavzusida Xalqaro ilmiy-amaliy konferentsiya
Andijon
27-29 oktabr 2021 yil
583
Адабиётлар:
1. https://ru.wikipedia.org/wiki/Cтандарт.
2. http://lcweb.loc.gov/z3950/agency).
3.
http://www.internic.net/
ADVANCED AUTOMOTIVE COOLING SYSTEM TO IMPROVE FUEL
EFFICIENCY
Salomov U.R. Rector of Fergana Polytechnic Institute
Moydinov D.A. AndMBI 1
st
course Doctoral Student
Zokirjonov A.Z. AndMBI 1
st
course Master Student
Andijan Machine-Building Institute, Uzbekistan
Advanced automotive engine cooling systems can positively impact the
performance, fuel economy, and reliability of internal combustion engines. A smart
engine cooling system typically features multiple real time computer controlled
actuators: a three-way linear smart valve, a variable speed coolant pump, and electric
radiator fan(s). In this dissertation, several innovative comprehensive nonlinear
control and optimization operation strategies for the next generation smart cooling
application will be analyzed. An advanced engine cooling system introduces the
concept of “thermal management” on regulating the engine coolant in a precise
desired working temperature with minimum power consumption. A smart cooling
system updates the mechanical pump and radiator fan(s) with electrical controlled
components and replaces the wax-based valve with a 3-way computer controlled
smart valve. The cooling system for internal combustion engines removes waste heat
to ensure a normal in-cylinder combustion process. To accomplish this task, the
thermostat valve, radiator, radiator fan(s), and water pump circulate cooling fluid
through the engine block and reject heat to the local environment. Since the cooling
system consumes a portion of the engine's power, it is important that its operation
use minimal input energy. In this chapter, a multiple radiator fan matrix was
controlled to minimize energy usage for subsequent efficiency gains. A
mathematical model for the radiator fan(s) and the forced convection heat transfer
process was developed to establish a mixed integer nonlinear programming problem.
An interior points approach was introduced to solve the minimization problem. A
series of laboratory tests have been conducted with different fan and speed
combinations, with the objective to cool a thermal loaded engine. The cooling
system in gasoline and diesel engines serves an important role in maintaining the
desired coolant temperature for enhanced performance. If the engine operates too
hot, then abnormal in-cylinder combustion may occur leading to degraded fuel
economy and tailpipe emissions. Approximately 25% of the total petroleum energy
converted during the spark ignition engine combustion process is lost to the cooling
system. As a result, the cooling system must accommodate a significant amount of
heat while working under ambient operating conditions. The cooling system also
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