Maintenance manual for sunray hfc4da1-2c china-IV diesel engines
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Section X Exhaust System
The exhaust pipe is composed of four exhaust manifolds leading to the exhaust master pipe and one manifold leading
to the exhaust gas chamber of EGR valve. During the operation, the exhaust gas from the combustion chamber is
introduced into the EGR valve by the manifold leading to the exhaust gas chamber of EGR valve through the EGR
passage in the cylinder head. Under the control of the EGR valve, the exhaust gas is mixed with fresh air and enters
into the combustion chamber to realize exhaust gas recirculation and reduce the emission.
4DA1-2C diesel engine real-time monitors the pressure drop of the exhaust gas post-treatment unit to determine
whether the post-treatment system is working normally. Via two pressure ports on the sensor, the pressure on two
sides of the exhaust gas post-treatment unit is introduced. The sensor converts the measurement into voltage value and
feeds back to the control unit, which can guarantee the sufficient oxidization of grains and prevent the blockage of
catalytic converter.
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