Injection pump with electronically controlled full-load stop

• US 4,243,004 A
• Filed: 01/24/1979
• Issued: 01/06/1981
• Est. Priority Date: 01/31/1978
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Locher, Johannes, Faupel, Werner, Ritter, Ernst, Hummel, Karsten
• Primary Examiner(s): Haroian, Harry N.
• Application Number:
  US06/006,308
• Time in Patent Office: 713 Days
• Field of Search: 123/140 R, 123/140 FG, 123/140 MC
• US Class Current: 123/367
• CPC Class Codes: F02M 59/447 means specially adapted to limit fuel delivery or to supply excess of fuel temporarily, e.g. for starting of the engine combined with fuel pump regulating devices F02D

Abstract

An injection pump with a full-load stop, preferably electronically controlled, which is adjustable against the force of a prestressed spring as a result of the control exerted by an electromagnet with a controllable stroke and which, when there is no current in the magnet, is displaceable by means of the spring into its terminal position which determines a reduced full-load quantity. Thus the maximum injection quantity is reduced in accordance with operating conditions and with the operational status of the engine; by this means, environmentally safer and smoother engine operation is possible at all operating conditions. The injection pump is also capable of continuing to function if the electrical or electronic parts fail.

Claims

1. An injection pump for Diesel fuel injected internal combustion engines wherein the quantity of fuel injected is regulated by displacement of a regulator rod means, the stroke of said regulator rod means having a detent means and being de-limited by means of a full-load stop means, said full-load stop means being settable in accordance with operational values of said engine by electronic control means, further wherein said full-load stop means is coupled with an armature of an electromagnet to provide for a predetermined stroke thereof and further means carried by said full-load stop means arranged to cooperate with prestressed resilient means capable of holding said full-load stop means in a terminal position to reduce full-load quantity of fuel injected.

2. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 1, further wherein said terminal position of said full-load stop means can be set by means of a further stop means which limits the stroke of said armature.

3. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 1, further wherein at least one terminal position of said full-load stop means is settable relative to said regulator rod means.

4. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 1, further wherein the regulator rod means comprises a lost-motion device that is positioned in close proximity to a detent means.

5. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 4, further wherein said lost-motion device includes a pre-stressed spring element, said spring element arranged to control the maximum force exerted on said regulator rod means.

6. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 1, further wherein said full-load stop means comprises a system of housed levers one of which levers is pivotable by means of said electromagnet.

7. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 6, further wherein said pivotable lever is supported in an opening in said housing and said electromagnet is mounted on said housing.

8. An injection pump for Diesel fuel injected internal combustion engines as claimed in claim 1, further wherein said resilient means is adjustably mounted relative to said regulator rod means.