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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

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CLUTCH

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1o

TEMP

CC

% 2

RPM

%

ENGINE

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1 1 1 ,

40 /

ENGINE ,pos. ,

STEPPING

11’

SENSOR

CONTROL COMPUTER

_ .

'

MOTOR I

1

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-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

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3o -

LU '

(n20_ 1o

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1o

30

so

70

9o

1 10

[AT 00

FIG. 2

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