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I'll assume that you are referring to how the fuel injection system operates when it runs open loop vs. closed loop.
In brief, a modern car's engine has a computer that controls how much fuel to deliver to the cylinders via the fuel injectors. It takes into account many things including the temperature of the air and engine, the speed of the engine, the load on the engine, etc. Based on all these inputs, it checks a table that was created by the designing engineers and determines how much fuel to deliver. However, the table cannot possibly take into account all the variables that exist in the real world. So the system is designed to measure the amount of oxygen left over in the exhaust using an O2 sensor. This information is used by the computer to make small corrections to the values from the table. The goal is to get the best possible combination of fuel economy, performance, and emissions. When this is occurring, the system is said to be running closed loop.
There are times, such as when the engine is cold or when the driver floors the gas pedal that the system is designed to only use the information from the table and to ignore the O2 sensor. Under these conditions the system is said to be running open loop.
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What is open loop and close loop system?
Q: What is the difference between 'Open Loop' and 'Closed Loop'? A: When the engine is first started, and rpm is above 400 rpm, the system goes into 'Open Loop' operation. In 'Open Loop', the ECM will ignore the signal from the Oxygen (O2) sensor and calculate the air/fuel ratio based on inputs from the coolant and MAF sensors, but mostly from a pre-programmed table in the memcal. The system will stay in 'Open Loop' until the following conditions are met: 1. The O2 sensor has varying voltage output, showing that it is hot enough to operate properly. (This depends on temperature) 2. The coolant sensor is above a specified temperature about 40oC/104oF. 3. A specific amount of time has elapsed after starting the engine. The specific values for the above conditions vary with different engines and are stored in the mem-cal. When these conditions are met, the system goes into 'Closed Loop' operation. In 'Closed Loop', the ECM will calculate the air/fuel ratio (injector on-time) based on the various sensors but mainly the O2 sensor. This allows the air/fuel ratio to stay very close to 14.7:1.
How does the car system work?
There are many different systems involved in an automobile, be more specific.
What is feedback loop and how does it work?
A feedback loop is a mechanism that is used to maintain homeostasis. In layman's terms, it is a checks and balances system within the body to keep hormone levels even.
How does the immune system work with the digestive system?
Actually, they work hand in hand. The immune system protects the digestive system from letting germs, bad bacteria, viruses, etc. The digestive system allows food/(Nutrients) to get to the brain and let the immune system work. So technically it's a loop
What is meant by the term Open System in computing?
An open system is a system that allows a great deal of flexibility. Similar to open source software, it allows users to improve the work as time goes by.
What is closed loop hydraulic systems?
It means that the pressurising medium does not leave the system and it is recirculated with make-up or top-up quantity as and when required. This makes it a sealed system to work with.
Is the ADH feedback loop an example of positive or negative feedback?
The ADH feedback loop is an example of a negative feedback loop. Negative feedback loops occur when the output of a system acts to oppose the changes to the input of the system. This is the case with ADH because when there is not enough water, the hypothalamus and pituitary gland work to release ADH so that the body can retain more water.
How does antifreeze work?
Antifreeze is a liquid added to the cooling system of an automobile to ensure that the water within it does not freeze solid.
How do Nematodes circulatory system work?
They don't have any circulatory system; fluids are dispersed into the pseudocoelom.
Is the ADH feedback loop an example of positive or negative feedback explain?
The ADH feedback loop is an example of a negative feedback loop. Negative feedback loops occur when the output of a system acts to oppose the changes to the input of the system. This is the case with ADH because when there is not enough water, the hypothalamus and pituitary gland work to release ADH so that the body can retain more water.
Why digital camera is an example of an close loop control system?
I dont know hello i no nothing about this but i think the work because its made out of baterys and well its digital
Advantages of open loop?
cheaper than closed loop open loop turn the switch you assume the light is on closed loop turn the switch observe the current observe the light level... can predict how much below optimal the performance is and predict when total failure will occur
