In an EGR system, backpressure refers to which condition?

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Multiple Choice

In an EGR system, backpressure refers to which condition?

Explanation:
Backpressure is the pressure in the exhaust system that the EGR gas must overcome to flow back into the intake. When the EGR valve opens, exhaust gas is drawn into the intake manifold, but it has to push against the existing exhaust pressure in the exhaust system. The higher that exhaust backpressure, the more the EGR flow is resisted. This concept is distinct from fluctuations in intake manifold pressure, exhaust gas temperature, or the driving force across the valve (the pressure difference). So the term describes the pressure inside the exhaust portion of the system, not the other factors.

Backpressure is the pressure in the exhaust system that the EGR gas must overcome to flow back into the intake. When the EGR valve opens, exhaust gas is drawn into the intake manifold, but it has to push against the existing exhaust pressure in the exhaust system. The higher that exhaust backpressure, the more the EGR flow is resisted. This concept is distinct from fluctuations in intake manifold pressure, exhaust gas temperature, or the driving force across the valve (the pressure difference). So the term describes the pressure inside the exhaust portion of the system, not the other factors.

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