Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Reexamination Certificate
2007-04-03
2007-04-03
Argenbright, T. M. (Department: 3747)
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
C060S599000, C123S344000, C123S478000
Reexamination Certificate
active
10563152
ABSTRACT:
An internal combustion engine is operated with a predetermined fixed A/F ratio in an operating range where the amount of intake air is not larger than a predetermined value but, in an operating range where the amount of intake air is larger than the predetermined value, the internal engine is operated with a variable lean A/F ratio which increases from the fixed A/F ratio as the amount of intake air increases. To achieve this, in a throttle valve (7a) whose opening is controlled based on a signal from an accelerator pedal position sensor (17), control is performed so that the correspondence ratio between the accelerator pedal position and the throttle valve opening increases as the A/F ratio increases. In the operating range where the engine is operated with a variable lean A/F ratio, the amount of intake air is increased by using a turbocharger (2). Then, fuel atomization is promoted by controlling the intake air cooling effect of an intercooler (6) so that the temperature of the intake air rises as the A/F ratio increases.
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Argenbright T. M.
Oliff & Berridg,e PLC
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