Device for adjusting the idling rpm

Claim 1

A device for regulating the idling rpm of an internal combustion engine having an intake pipe with a throttle valve therein, which throttle valve is actuatable as desired, there being a bypass disposed around the throttle valve, and wherein the bypass has a bypass valve which is controlable as a function of operating parameters of the internal combustion engine, said bypass valve having a valve element, said valve element being displaceable relative to a valve seat by an electromagnet in order to regulate the size of a passage cross section, there being a back-pressure chamber, the valve element having a pressure-equalization surface located in the back-pressure chamber, wherein a pressure-equalization connection from the back-pressure chamber leads to the upstream side of the valve element, and wherein said pressure-equalization connection commences at a narrowest part of a gap between the valve element and the valve seat; and wherein said valve seat includes a housing and a flange-like structural part and a step in the housing, said pressure-equalization connection bebouching into said step, the step being closed off from the gap and the downstream side of said bypass valve by said flange-like structural part, said structural part forming the valve seat and having at least one pressure-inlet hole towards the gap.

Claim 2

A device for regulating the idling rpm of an internal combustion engine having an intake pipe with a throttle valve therein, which throttle valve is actuatable as desired, there being a bypass disposed around the throttle valve, and wherein the bypass has a bypass valve which is controlable as a function of operating parameters of the internal combustion engine, said bypass valve having a valve element, said valve element being displaceable relative to a valve seat by an electromagnet in order to regulate the size of a passage cross section, there being a back-pressure chamber, the valve element having a pressure-equalization surface located in the back-pressure chamber, wherein a pressure-equalization connection from the back-pressure chamber leads to the upstream side of the valve element, and wherein said pressure-equalization connection commences at a narrowest part of a gap between the valve element and the valve seat; and wherein said valve seat includes a housing and a flange-like structural part and a step in the housing, said pressure-equalization connection bebouching into said step, the step being closed off from the gap and the downstream side of said bypass valve by said flange-like structural part, said structural part forming the valve seat and having at least one pressure-inlet hole towards the gap.

Claim 3

A device for regulating the idling rpm of an internal combustion engine having an intake pipe with a throttle valve therein, which throttle valve is actuatable as desired, there being a bypass disposed around the throttle valve, and wherein the bypass has a bypass valve which is controllable as a function of operating parameters of the internal combustion engine, said bypass valve having a valve element, said valve element being displaceable relative to a valve seat by an electromagnet in order to regulate the size of a passage cross section, the improvement wherein said device further comprises a back-pressure chamber, the valve element having a pressure-equalization surface located in the back-pressure chamber, wherein a pressure-equalization connection from the back-pressure chamber leads to the upstream side of the valve element, said back-pressure chamber communicating solely with the upstream side of said valve element via said pressure-equalization connection to isolate a back-pressure of said chamber from a pressure of said intake pipe downstream of said valve element, and wherein said pressure-equalization connection commences at a narrowest part of a gap between the valve element and the valve seat; and wherein said valve element is formed with an approximately conical region configured for movement into the valve seat, and said valve seat has a conical widening towards an outlet side.

Claim 4

A device for regulating the idling rpm of an internal combustion engine having an intake pipe with a throttle valve therein, which throttle valve is actuatable as desired, there being a bypass disposed around the throttle valve, and wherein the bypass has a bypass valve which is controllable as a function of operating parameters of the internal combustion engine, said bypass valve having a valve element, said valve element being displaceable relative to a valve seat by an electromagnet in order to regulate the size of a passage cross section, the improvement wherein said device further comprises a back-pressure chamber, the valve element having a pressure-equalization surface located in the back-pressure chamber, wherein a pressure-equalization connection from the back-pressure chamber leads to the upstream side of the valve element, said back-pressure chamber communicating solely with the upstream side of said valve element via said pressure-equalization connection to isolate a back-pressure of said chamber from a pressure of said intake pipe downstream of said valve element, and wherein said pressure-equalization connection commences at a narrowest part of a gap between the valve element and the valve seat; and wherein said valve element is formed with an approximately conical region configured for movement into the valve seat, and said valve seat has a conical widening towards an outlet side.