Page 166 - Methods For Monitoring And Diagnosing The Efficiency Of Catalytic Converters A Patent - oriented Survey

148 Methods for Monitoring and Diagnosing the Eficiency of Catalytic Converters

@j = Cyi .zj+j
J
where,
i : sampling number of y
J : phase difference to i
The complement function of the correlation function @j is calculated according to the
following equation:

where 7 and Fare complementary signals ofy and z respectively

output signal of upstream
NF sensor
and comparison level k

binary code signal b)
generatedbycompa- 'm r

rison of 2 waves of 0 k
fig. a I J I
I I I
feedback coeff of NF ,p, I I
I
output signal of downstream L*m ' , 1
mm
I
d)
I
I
NF sensor and - A I I$@#? 1
'
I/
I
son level s, L/=-- I I wy
I
I
I
binary code signal 1 -
I
I
I
generated by compa- I I
rison of 2 waves of z
fig. d
Fig. 68 (from US5237818)