Method and apparatus for mixture preparation of internal combustion engines

Claim 3

A method according to claim 1, in which the control of the warm air preparation takes place by a temperature-dependent controlled admixture of fresh air to a warm air stream whose source heats up more rapidly than the internal combustion engine.

Claim 4

A method according to claim 2, further comprising the steps of effecting the warm air connection and disconnection in dependence on the adjustment of an output control member of the internal combustion engine with the use of a control asymmetric to the output control member and in which exclusively warm air is supplied to the internal combustion engine in the lower partial load range and after a predetermined adjusting path of the output control member exclusively fresh air is supplied thereto.

Claim 5

A method according to claim 1, further comprising the steps of effecting the warm air connection and disconnection in dependence on the adjustment of an output control member of the internal combustion engine with the use of a control asymmetric to the output control member and in which exclusively warm air is supplied to the internal combustion engine in the lower partial load range and after a predetermined adjusting path of the output control member exclusively fresh air is supplied thereto.

Claim 6

An installation for the mixture preparation for internal combustion engines to adapt the suction air temperature to the changing load and operating conditions of internal combustion engines for motor vehicles, in which preheated air is supplied to the internal combustion engine by way of the suction system in the partial load ranges while exclusively fresh air is supplied thereto in the full load range, characterized by a control system including control means controlling the temperature of the warm air serving for the mixture formation over the entire range of its admixture so as to have a substantially constant temperature.

Claim 7

An installation for the mixture preparation for internal combustion engines to adapt the suction air temperature to the changing load and operating conditions of internal combustion engines for motor vehicles, in which preheated air is supplied to the internal combustion engine by way of the suction system in the partial load ranges while exclusively fresh air is supplied thereto in the full load range, characterized by a control system including control means controlling the temperature of the warm air serving for the mixture formation over the entire range of its admixture so as to have a substantially constant temperature.

Claim 8

An installation according to claim 5, characterized in that the warm-air preparation by temperature controlled admixture means of fresh air to a warm-air stream having a source that warms up more rapidly than the internal combustion engine.

Claim 9

An installation according to claim 5, characterized in that the warm-air connection and disconnection takes place in dependence on the adjustment of an output control member of the internal combustion engine with the use of a control means that is asymmetric to said output control member, said asymmetric control means being operable to supply to the combustion engine exclusively warm air in the lower partial load range and exclusively fresh air after a predetermined adjustment path of the output control member.

Claim 10

An installation according to claim 7, characterized by a suction pipe means provided with a substantially radial warm-air suction aperture and a substantially axial fresh-air suction aperture, closure valve means forming part of said control means and pivotally arranged in said suction pipe means about a pivot axis disposed substantially transversely to the flow direction, both the warm-air suction aperture as also thE fresh-air suction aperture being arranged within the pivot range of the closure valve means.

Claim 11

An installation according to claim 8, characterized by a warm-air line connected to the warm-air suction aperture, a radially arranged fresh-air inlet being connected to the warm-air line, and control valve means operable to close said fresh air inlet.

Claim 12

An installation according to claim 9, characterized in that said control valve means is symmetrically mounted with respect to the fresh-air inlet and the warm-air line cross section.

Claim 13

An installation according to claim 10, characterized in that the control valve means is adjustable by a thermostatic operating element detecting the warm air temperature within the area of warm-air suction aperture.

Claim 14

An installation according to claim 11, characterized in that a mixing chamber means is connected upstream of the warm-air suction aperture by way of a warm-air shaft, the warm-air line, on the one hand, and the fresh-air inlet, on the other, being connected to said mixing chamber means at an acute angle to each other.

Claim 15

An installation according to claim 12, characterized by adjusting means for adjusting the closure valve means including a cam disk operatively connected with the output control member of the internal combustion engine, said cam disk having cam surfaces of differing configurations to provide an influencing of the closure valve means only upon exceeding a predetermined adjusting path of the output control member limiting the lower partial load range of the internal combustion engine, the closure valve means being released upon exceeding the lower partial load range and the warm-air suction aperture being simultaneously closed thereby.

Claim 16

An installation according to claim 7, characterized in that the warm-air preparation by temperature controlled admixture means of fresh air to a warm-air stream having a source that warms up more rapidly than the internal combustion engine.

Claim 17

An installation according to claim 5, characterized by a suction pipe means provided with a substantially radial warm-air suction aperture and a substantially axial fresh-air suction aperture, closure valve means forming part of said control means and pivotally arranged in said suction pipe means about a pivot axis disposed substantially transversely to the flow direction, both the warm-air suction aperture as also the fresh-air suction aperture being arranged within the pivot range of the closure valve means.

Claim 18

An installation according to claim 15, characterized by a warm-air line connected to the warm-air suction aperture, a radially arranged fresh-air inlet being connected to the warm-air line, and control valve means operable to close said fresh air inlet.

Claim 19

An installation according to claim 16, characterized in that said control valve means is symmetrically mounted with respect to the fresh-air inlet and the warm-air line cross section.

Claim 20

An installation according to claim 16, characterized in that the control valve means is adjustable by a thermostatic operating element detecting the warm air temperature within the area of warm-air suction aperture.

Claim 21

An installation according to claim 16, characterized in that a mixing chamber means is connected upstream of the warm-air suction aperture by way of a warm air shaft, the warm-air line, on the one hand, and the fresh-air inlet, on the other, being connected to said mixing chamber means at an acute angle to each other.

Claim 22

An installation according to claim 15, characterized by adjusting means for adjusting the closure valve means including a cam disk operatively connected with the output control member of the internal combustion engine, said cam disk having cam surfaces of differing configurations to provide an influencing of the closure valve means only upon exceeding a predetermined adjusting path of the output control member limiting the lower partial load range of the internal combustion engine, the closure valve means being released uPon exceeding the lower partial load range and the warm-air suction aperture being simultaneously closed thereby.

Claim 25

A method according to claim 21, wherein said step of controlling the temperature includes maintaining the temperature of the preheated air from said preheated air source as substantially constant for all engine operating conditions.

Claim 26

A method according to claim 21, wherein said step of selectively controlling the supply of combustion air includes controlling said supply such that only air from said preheated air source is supplied to said air inlet line means during certain partial engine load operations.

Claim 27

A method according to claim 21, wherein said step of controlling the temperature includes mixing a warm air stream with a fresh air stream in said preheated air source at a position upstream of said air inlet line means and separately from any mixing of air from said preheated air source with air from said fresh air source in said air inlet line means.

Claim 28

A method according to claim 24, wherein said step of controlling the temperature includes maintaining the temperature of the preheated air from said preheated air source as substantially constant for all engine operating conditions.

Claim 29

A method according to claim 25, wherein said step of selectively controlling the supply of combustion air includes controlling said supply such that only air from said preheated air source is supplied to said air inlet line means during certain partial engine load operations.

Claim 30

A method according to claim 22, wherein said step of controlling the supply of combustion air includes controlling a closure valve to selectively close said fresh air and preheated air source as a direct function of the position of an output control member for the engine.

Claim 31

An installation for supplying combustion air to an internal combustion engine comprising: air inlet line means leading to said engine, fresh air source means arranged upstream of said air inlet line means, preheated air source means arranged upstream of said air inlet line means and separately from said fresh air source means, combustion air supply control means for controlling the supply of combustion air from said fresh air and preheated air source means to said air inlet line means in response to engine operating conditions such that preheated air from said preheated air source means is supplied during partial engine load operations and such that only fresh air from said fresh air source is supplied during full engine load operations, and preheated air temperature control means for maintaining the preheated air supplied by said preheated air source means at a substantially constant temperature at least during engine operating conditions when air is being supplied from said preheated source means to said air inlet line means.

Claim 32

An installation for supplying combustion air to an internal combustion engine comprising: air inlet line means leading to said engine, fresh air source means arranged upstream of said air inlet line means, preheated air source means arranged upstream of said air inlet line means and separately from said fresh air source means, combustion air supply control means for controlling the supply of combustion air from said fresh air and preheated air source means to said air inlet line means in response to engine operating conditions such that preheated air from said preheated air source means is supplied during partial engine load operations and such that only fresh air from said fresh air source is supplied during full engine load operations, and preheated air temperature control means for maintaining the preheated air supplied by said preheated air source means at a substantially constant temperature at least during engine operating conditions when air is being supplied from said preheated source means to said air inlet line means.

Claim 33

An installation according to claim 28, wherein said temperature control means includes means for warming the air more rapidly than thE internal combustion engine.

Claim 34

An installation according to claim 28, wherein said preheated air temperature control means includes means for mixing a warm air stream with a fresh air stream in said preheated air source means at a position upstream of air inlet line means and separately from any mixing of air from said preheated air source with air from said fresh air source in said air inlet line means.

Claim 35

An installation according to claim 30, wherein said preheated air temperature control means includes temperature control valve means for controlling said fresh air stream to said preheated air source means as a function of the temperature of the air in said preheated air source means at a position adjacent said air inlet line means.

Claim 36

An installation according to claim 28, wherein said combustion air supply control means includes a closure valve means which is pivotally arranged adjacent the upstream end of said air inlet line means for movement between positions selectively communicating said fresh air and preheated air source means with said upstream end, and wherein said closure valve means is movable between a first position with only air from said preheated air source means being communicated to said upstream end and a second position with only air from said fresh air source means being communicated to said upstream end.

Claim 37

An installation according to claim 31, wherein said combustion air supply control means includes a closure valve means which is pivotally arranged adjacent the upstream end of said air inlet line means for movement between positions selectively communicating said fresh air and preheated air source means with said upstream end, and wherein said closure valve means is movable between a first position with only air from said preheated air source means being communicated to said upstream end and a second position with only air from said fresh air source means being communicated to said upstream end.

Claim 38

An installation according to claim 32, characterized by adjusting means for adjusting the closure valve means including cam disk operatively connected with the output control member of the internal combustion engine, said cam disk having cam surfaces of differeing configurations to provide an influencing of the closure valve means only upon exceeding a predetermined adjusting path of the output control member limiting the lower partial load range of the internal combustion engine, the closure valve means being released upon exceeding the lower partial load range and the warm-air suction aperture being simultaneously closed thereby.

Claim 39

An installation according to claim 28, wherein said preheated air temperature control means includes means for maintaining a constant temperature of the air in said preheated air source means for all engine operating conditions.

Claim 40

An installation according to claim 34, wherein said preheated air temperature control means includes means for maintaining a constant temperature of the air in said preheated air source means for all engine operating conditions.

Claim 41

An installation according to claim 32, wherein said preheated air temperature control means includes means for maintaining a constant temperature of the air in said preheated air source means for all engine operating conditions.