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.
In control system theory:
Basically open loop systems are those which provide an output depending on how they are expected to work irrespective of the changes that occur in the output due to some disturbances whereas closed loop control systems are those whose output is checked with the desired result and system parameters are varied in order that the output is as per the requirement.
For Example: In old Air conditioning system, the systems used to work at certain interval without observing the room temperature. But in modern Air Conditioning System, the system senses the room temperature by using temperature sensor,if temperature exceeds certain limit then only the system starts cooling. So, old systems are example of open loop control and new systems are example of closed loop control.
Open Loop control Systems have input, then the input is processed by various components like amplifiers, filters etc, then final out stage.
The main difference between open loop and closed loop systems is that in open loop systems there is no feedback.
in open loop systems feedback is not present while in closed loop it is present..
A Closed loop system basically will have a feedback which enables the rectification of the error in the main process,whereas it is not possible in an open loop system
An open loop transfer function is the transfer function of a system without incorporating the feedback component. For example, where the closed loop transfer function with unity feedback H(s) = G(s)/(1+G(s)) it can be deduced that the open loop transfer function is Y(s)/U(s) = G(s).
closed loop system
An open loop traffic signal just cycles on a schedule and has no "knowledge" of traffic patterns or current traffic. A closed loop system would have sensors letting it know when traffic was present and a controller that would make decisions based on the traffic conditions.
A: DEFINITELY NOT Open loop is defined as no feedback. any kind of negative feedback will reduce the gain
loop checking is perform before cable termination..the difference between a close loop and open loop is,tha close loop has a feedback while the open loop has not.
no.
The system without feedback is known as open loop system. The examples of the open loop system are bread toaster, oven ,washing machine. The open loop systems are inaccurate & less complex.
Closed
The sensitivity of an open loop control system is always 1, it is due to no feedback involved in open loop.
The open loop system is simple and economicaleasier to constructstable
Brown bear have a close circulation system
no difference that's the difference
A Closed loop system basically will have a feedback which enables the rectification of the error in the main process,whereas it is not possible in an open loop system
closed loop system
An open loop transfer function is the transfer function of a system without incorporating the feedback component. For example, where the closed loop transfer function with unity feedback H(s) = G(s)/(1+G(s)) it can be deduced that the open loop transfer function is Y(s)/U(s) = G(s).
yes