# US 4,392,469 A · RPM Regulating device for the fuel injection system of an internal combustion engine

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- Number: US 4,392,469 A
- Document ID: US4392469A
- Status: Granted
- Kind: A
- Application number: 06/294,079
- Filed: 1981-08-19
- Granted: 1983-07-12
- Earliest claimed: 1980-10-10
- Assignees: Robert Bosch GmbH
- Inventors: Wolf Wessel
- Web page: https://patentgrep.com/patent/US4392469A

## CPC

- F02D 1/12: non-mechanical, e.g. hydraulic
- F02D 1/02: not restricted to adjustment of injection timing, e.g. varying amount of fuel delivered
- F02M 41/126: {valves being mechanically or electrically adjustable sleeves slidably mounted on rotary piston}
- F02M 41/128: {Varying injection timing by angular adjustment of the face-cam or the rollers support}
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

A regulator shaft, rotary centrifugal weights, and a governor member which is slidable on the regulator shaft, are arranged in a pressurized, fuel-filled inner chamber of a fuel injection apparatus. The centrifugal weights engage regulator springs via the governor member and a control sleeve. The governor member is closed adjacent the free end of the regulator shaft except for a throttle opening for communication with the inner chamber. The governor member is provided with a work chamber, one extremity of which is limited by the regulator shaft. A conduit leading to a fuel tank communicates with the work chamber. A magnetic valve connected to an electronic control device for control of the fuel flow is provided in the conduit. Opening the magnetic valve causes a pressure drop in the work chamber which in turn causes the governor member to press against the centrifugal weights, thus enhancing the fuel injection quantity so as to reduce deviations from those desired and pre-set.

## Claims

### Claim 1

In a fuel injection apparatus for internal combustion engines, including: a fuel supply pump; a housing defining an inner chamber into which fuel is delivered by the fuel supply pump; a fuel injection pump delivering fuel from the inner chamber to the engine; an rpm regulator having an adjustable governor member; adjustable lever means associated with said governor member for initial setting thereof; a work chamber disposed in said governor member communicating via a throttle with said inner chamber; bore means provided within said governor member in communication with said work chamber; and an hydraulic setting mechanism which varies the moment of fuel delivery by the fuel injection pump as a function of pressure in the inner chamber, the improvement comprising:
a control line connects said bore means with a fuel supply tank; said control line is further provided with a magnetic valve to control fuel flow; said magnetic valve is further connected to an electronic control device; and said electronic control device includes at least one sensor for measuring at least one operational characteristic of the internal combustion engine.

### Claim 2 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said sensor comprises a rpm transmitter for measuring the rpm of the internal combustion engine.

### Claim 3 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said sensor comprises a torque pickup for measuring the load factor exerted upon the internal combustion engine.

### Claim 4 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said sensor comprises a temperature sensor for measuring the temperature of the internal combustion engine.

### Claim 5 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said control line further includes a throttle means upstream of said magnetic valve.

### Claim 6 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said magnetic valve includes an adjustable cross-section and said adjustable cross-section is controlled by said electronic control device.

### Claim 7 (depends on 1)

A rpm regulating device according to claim 1, characterized in that said electronic control device emits impulses of variable sequence and duration to open the magnetic valve.