[73] Assigneei Saturn Corporation, Troy, Mich- delivered by .... ion, by regulating
the amount of output power deliv ered by the ... air conditioning compressor on
and off, to keep the refrigerant .... 1 is a schematic diagram of an internal combus.
I
USOO5163399A
Unlted States Patent [19]
[11] Patent Number:
Bolander et al.
[45]
[54]
5,018,362
METHOD FOR ADJUSTING ENGINE
OUTPUT LOADINGPOWER DUE ToTO A VARIABLE COMPENSATE CAPACITY FOR
[73] Assigneei [211
5/1991
Nagase ............................. .. 62/2285
Attorney Agent’ 0" Firm_jimmy L" unke [57] ABSTRACI‘
fM'h.
o
Nov. 17, 1992
pn'mmy Examiner_carl S. Miller
[75] Inventors: William J. Bolander, Clarkston; Michael R. Witkowslu', Sterling mg S
Date of Patent:
7 5,024,196 5,022,232 6/1991 Ohucha Sakamoto .............................. .. 123/339
AIR CONDITIONING COMPRESSOR
H'ht,both
5,163,399
.
‘C
.
.
A method is described for adjusting the output power
Saturn Corporation, Troy, Mich-
App1_ No‘; 638,300
delivered by an internal combustion engine to compen
'
sate for variations in engine loading induced by a vari
_
able capacity refrigerant compressor of a vehicle air
[22] F‘led:
Jan‘ 7’ 1991
conditioning system. This is accomplished by estimating
[51] [52]
Int. Cl.5 ..................... .. F02M 3/07; B6OH 3/04 U.S. Cl. ....................... .. 123/339; 62/2285
the change in engine loading due to the compressor, based upon an indication of the engine intake air tem
[58]
Field of Search .................. .. 62/2281, 228.5, 230,
perature, and then, adjusting the setting of an engine
[56]
62/3231; 123/357, 358, 359, 339 References Cited
output power control mechanism, in accordance with the estimate. An estimate for the change in engine load ing induced when starting or stopping the variable ca
U.S. PATENT DOCUMENTS
pacity compressor is derived from a schedule of values
__________ __ 62/22g_1
based upon the temperature of the engine intake air. An
62/2285 62/2235
estimate for the change in engine loading induced by the off-idle operation of the variable capacity compres
" 62/2235
sor is derived as a function of the difference between the
4,862,700 9/1989 Suzuki 4,887,570 12/1939 Meicher ........................ ..'.‘.'.. 123/339 4,898,005 2/1990 Sakurai.
intake air temperature and a retained previous value for
4,633,675 4,488,411 3,702,065 12/1984 11/1972 1/1987 Jacobs Sato Hara .......... ..
4,698,977 10/1987 Takahashi 4,723,416
4,955,342
2/1988
Suzuki ...... ..
the imake air temperature
9/1990 Tohmiya ........................... ., 123/339
/42
5 Claims, 4 Drawing Sheets
-—-—>
38
34
VARIABLE
_
CAPACITY
\30
COMPRESSOR
I
CLUTCH
/
1o
TEMP
CC
% 2
RPM
%
ENGINE
922
Z O (J
1< to
I
UQW
< 0: 1-
_l 1.1.1 >
1 1 1 ,
40 /
ENGINE ,pos. ,
STEPPING
11’
SENSOR
CONTROL COMPUTER
_ .
'
MOTOR I
1
/‘
-14
24
22
2o
16
TEMP.
MT
SENSOR
2 ‘a’ E 5 U1
\ 213 IAC
US. Patent
40
2
Nov. 17, 1992
Sheet 2 of 4
5,163,399
~
3o -
LU '
(n20_ 1o
-
1o
30
so
70
9o
1 10
[AT 00
FIG. 2
so
-
I
g2
:
,_
i
