Fuel control system for supercharged, fuel injected internal combustion engines

In a fuel control system for supercharged, fuel injected internal combustion engines employing exhaust gas turbo-chargers, comprising:

• a pressure actuated first movable partition means;
• at least one return spring opposing the motion of said first partition means;
• a setting member;
• and means connecting the setting member to said first partition means, said setting member being actuated by the motion of said partition means whereby the operating region of a fuel quantity adjustment member of the injection system of the engine is changeable in the direction of increasing supply quantity during a period of increasing intake manifold pressure, the improvement comprising:
• a supplementary pneumatic control unit having delayed feedback characteristics and including a second movable partition means, means connected to one side of said first movable partition means and said second movable partition means for supplying a pressurized medium thereto, means for connecting said second partition means to said setting member, a delay member connected to said control unit through which a pressurized medium is supplied to the other side of said second movable partition means, and a connecting rod, by means of said control unit the position of said setting member is made to be additionally changeable, said second movable partition means being acted on by a differential pressure of a pneumatic control medium delivered through said connecting means to the one side of said second movable partition means and through said delay member the other side of said second movable partition means, wherein the pneumatic control medium is engine intake manifold air whose pressure is a measure of the engine acceleration, wherein the instantaneous difference between the intake manifold pressure which increases during engine acceleration and the counter pressure which increases at a lower rate due to said delay member defines the magnitude of said differential pressure, wherein said movable partition means are formed to include two coaxial sequentially disposed and oppositely acting diaphragms of different diameter, said diaphragms being connected together by said connecting rod which in turn is connected to said setting member by said connecting means, wherein the space surrounding said connecting rod and lying between said two diaphragms is exposed to ambient air pressure, and wherein the larger of said two diaphragms is exposed to the full manifold pressure whereas the smaller of said two diaphragms is exposed to the delayed increasing manifold counter pressure so that during constant engine rpm only the differential area of said two diaphragms is effective, whereby during periods of increasing pressure of the control medium, said setting member tends to be supplementarily displaced beyond the position set by said first movable partition means and in the direction of an increasing fuel supply quantity, and whereby during constant speed operation the supplementary displacement is reversible to a zero value by the effect of an increasing counter pressure exerted by the control medium, said counter pressure being increased in a delayed manner by said delay member.

In a fuel control system for supercharged, fuel injected internal combustion engines employing exhaust gas turbo-chargers, comprising:

• a pressure actuated first movable partition means;
• at least one return spring opposing the motion of said first partition means, a setting member;
• and means connecting the setting member to said first partition means, said setting member being actuated by the motion of said partition means whereby the operating region of a fuel quantity adjustment member of the injection system of the engine is changeable in the direction of increasing supply quantity during a period of increasing intake manifold pressure, the improvement comprising:
• a supplementary pneumatic control unit having delayed feedback characteristics and including a second movable partition means, means connected to one side of said first movable partition means and said second movable partition means for supplying a pressurized medium thereto, means for connecting said second partition means to said setting member, a delay member connected to said control unit through which a pressurized medium is supplied to the other side of said second movable partition means, and a connecting rod, by means of said control unit the position of said setting member is made to be additionally changeable, said second movable partition means being acted on by a differential pressure of a pneumatic control medium delivered through said connecting means to the one side of said second movable partition means and through said delay member the other side of said second movable partition means, wherein the pneumatic control medium is engine intake manifold air whose pressure is a measure of the engine acceleration, wherein the instantaneous difference between the intake manifold pressure which increases during engine acceleration and the counter pressure which increases at a lower rate due to said delay member defines the magnitude of said differential pressure, wherein said second movable partition means includes a primary pressure surface and a counter pressure surface, wherein the supplementary displacement of said setting member is effected by said second movable partition means, wherein full manifold pressure acts on the primary pressure surface and as a result of said delay member a delayed increasing counter pressure derived from said manifold pressure acts on the counter pressure surface, wherein said second movable partition means is formed to include two coaxial, sequentially disposed diaphragms of equal diameter, said diaphragms being connected together by said connecting rod which in turn is pivotably connected to said setting member by said connecting means, and wherein the primary pressure side of one of said two diaphragms is exposed to the full manifold air pressure and the corresponding primary pressure side of the second of said two diaphragms serves as the counter pressure side of said second movable partition means and is exposed to the delayed increasing manifold air counter pressure, whereby during periods of increasing pressure of the control medium, said setting member tends to be supplementarily displaced beyond the position set by said first movable partition means and in the direction of an increasing fuel supply quantity, and whereby during constant speed operation the supplementary displacement is reversible to a zero value by the effect of an increasing counter pressure exerted by the control medium, said counter pressure being increased in a delayed manner by said delay member.

In a fuel control system for supercharged, fuel injected internal combustion engines employing exhaust gas turbo-chargers, comprising:

• a pressure actuated first movable partition means;
• at least one return spring opposing the motion of said first partition means;
• a setting member;
• and means connecting the setting member to said first partition means;
• said setting member being actuated by the motion of said partition means whereby the operating region of a fuel quantity adjustment member of the injection system of the engine is changeable in the direction of increasing supply quantity during a period of increasing intake manifold pressure, the improvement comprising:
• a supplementary pneumatic control unit having delayed feedback characteristics and including a second movable partition means, means connected to one side of said first movable partition means and said second movable partition means for supplying a pressurized medium thereto, means for connecting said second partition means to said setting member, a delay member connectedd to said control unit through which a pressurized medium is supplied to the other side of said second movable partition means, and a check-valve mounted parallel to said flow-throttle, by means of said control unit the position of said setting member is made to be additionally changeable, said second movable partition means being acted on by a differential pressure of a pneumatic control medium delivered through said connecting means to the one side of said second movable partition means and through said delay member the other side of said second movable partition means, wherein the pneumatic control medium is engine intake manifold air whose pressure is a measure of the engine acdeleration, wherein the instantaneous difference between the intake manifold pressure which increases during engine acceleration and the counter pressure which increases at a lower rate due to said delay member defines the magnitude of said differential pressure, wherein said second movable partition means includes a primary pressure surface and a counter pressure surface, wherein the supplementary displacement of said setting member is effected by said second movable partition means, wherein full manifold pressure acts on the primary pressure surface and as a result of said delay member a delayed increasing counter pressure derived from said manifold pressure acts on the counter pressure surface, wherein said means connected to said control unit and through which said control medium is communicated to said second movable partition means includes a supply channel leading to the chamber which is contiguous to said counter pressure side of said second movable partition means, wherein said delay member is inserted in said supply channel, said delay member having a flow-throttle therein, and wherein said check-valve serves to insure an unthrottled return flow of said control medium from the chamber contiguous to said counter pressure side of said second movable partition means, whereby during periods of increasing pressure of the control medium, said setting member tends to be supplementarily displaced beyond the position set by said first movable partition means and in the direction of an increasing fuel supply quantity, and whereby during constant speed operation the supplementary displacement is reversible to a zero value by the effect of an increasing counter pressure exerted by the control medium, said counter pressure being increased in a delayed manner by said delay member.

In a fuel control system for supercharged, fuel injected internal combustion engines employing exhaust gas turbo-chargers, comprising:

• a pressure actuated first movable partition means;
• at least one return spring opposing the motion of said first partition means;
• a setting member;
• and means connecting the setting member to said first partition means, said setting member being actuated by the motion of said partition means whereby the operating region of a fuel quantity adjustment member of the injection system of the engine is changeable in the direction of increasing supply quantity during a period of increasing intake manifold pressure, the improvement comprising:
• a supplementary pneumatic control unit having delayed feedback characteristics and including a second movable partition means, means connected to one side of said first movable partition means and said second movable partition means for supplying a pressurized medium thereto, means for connecting said second partition means to said setting member, a delay member connected to said control unit through which a pressurized medium is supplied to the other side of said second movable partition means and a connecting rod, by means of said control unit the position of said setting member is made to be additionally changeable, said second movable partition means being acted on by a differential pressure of a pneumatic control medium delivered through said connecting means to the one side of said second movable partition means and through said delay member the other side of said second movable partition means, where said pressure is a measure of the engine acceleration, wherein said movable partition means are formed to include two coaxial and sequentially disposed diaphragms, with said first diaphragm being fixedly connected with said setting member by said connecting means and with said second diaphragm acting on said setting member through the action of said connecting rod, wherein each said diaphragm includes a primary pressure surface and a counter pressure surface, and wherein said second diaphragm is larger than said first diaphragm, with both said diaphragms defining together three separate chambers of which the chamber contiguous to the primary pressure surface of said second diaphragm experiences the full manifold air pressure, the middle chamber which is contiguous simultaneously to the counter pressure surface of said second diaphragm and the primary pressure surface of said first diaphragm experiences the delayed increasing manifold counter pressure, and the chamber which is contiguous to the counter pressure surface of said first diaphragm experiences ambient air pressure, whereby during periods of increasing pressure of the control medium, said setting member tends to be supplementarily displaced beyond the position set by said first movable partition means and in the direction of an increasing fuel supply quantity, and whereby during constant speed operation the supplementary displacement is reversible to a zero value by the effect of an increasing counter pressure exerted by the control medium, said counter pressure being increased in a delayed manner by said delay member.