Chery A21 2005, Service Manual, Page: 40 / 475

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SECTION II INTRODUCTION TO NEW ENGINE
TECHNOLOGIES
——
CBR& VVT
1. CBR PROFILE
CBR principle and structure
By controlling the organization modes of air
flow (eddy flow and turbulent flow), CBR
(Controlled Bum Rate) can improve the burn
rate, reduce displacement, and boost the
economical efficiency of fuel.
This engine adopts sliding plate CBR.
●
When the engine operates at low speed,
the vacuum actuator shall drag the sliding
plate to move towards the direction
shown in the figure by use of rocker
assembly, and the neutral air passage
shall be shut off basically (there is only a
gap on the top right corner). The mixing
of oil mist and air mainly depends on the
eddy flow of air intake provided by
tangential air duct, thus improving the
combustion status.
●
When the engine operates at high speed,
CBR control valve shall cut off the
vacuum condition of vacuum actuator;
thanks to the spring functions, the sliding
plate shall return to the position
illustrated in the figure, and the neutral
air duct shall also be opened, which
increases the turbulent flow of air intake
and improve the maximum power.
Structure of sliding plate
1) Sliding plate
2) Rocker and shaft assembly
3) Bracket
4) Vacuum actuator
Tangential Air Duct
Neutral Air Duct
1
2
3
4
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