Bosch Fuel Injection Rqv Rquv Ep Rsv Equipment

Fuel Injection Equipment for Diesel Engines Governors for In-Line Pumps

Š 1975 Robert Bosch GmbH Postfach 50, D-7000 Stuttgart 1 Automotive Equipment Division Department for Technical Publications KH/VDT Editor in chief: Ulrich Adler Editor: Erich Kaufmann Translation 1977): John T. Warner, Michael J. Scott Composition, graphics, layout: Dept. KH/VDT In consultation with the technical departments of our organisation. Reproduction, duplication and translation of this publication, even in abridged form, is only to ensue with our previous written consent and with particulars of source. Illustrations, descriptions, diagrams and other particulars only serve for elucidation and presentation of the text. They are not binding as regards details of construction, installation or delivery.

We undertake no liability for conformity of the text with national or local regulations.

Subject to revision.

Printed in the Federal Republic of Germany.

Imprime en Republique FĂŠderale d'Allemagne.

1st edition 30th September 1975

Table of Contents

Introduction 6 6 General 6 Why is a governor required with a diesel engine?

8 Speed Droop 8 Functions of the Governor 10 Torque Control 12 13 13 14 14

Types of Governor Maximum-Speed Governors Minimum-Maximum-Speed Governors Variable-Speed Governors Combination Governors

Mechanical Governors 15 15 Metering Units 16 Minimum-Maximum-Speed Governor RQ 20 Minimum-Maximum-Speed Governor RQU 20 Maximum-Speed Governors RQ and RQU 21 Variable-Speed Governor RQV 24 Variable-Speed Governor RQUV 25 Variable-Speed Governor ROy.. K 28 Combination Governors ROy and RQUV 28 Variable-Speed Governor EP/RSV 32 Variable-Speed Governor EPRSUV 33 Minimum-Maximum-Speed Governor EP RS Control-Lever and Control-Rod Stops for Mechanical Governors Control-Lever Stops 36 36 Spring-Loaded Idle-Speed Stop 36 Reduced-Delivery Stop 37 Control-Rod Stops 37 Rigid Excess-Fuel Stop for Starting 37 Spring-Loaded Control-Rod Stop for RQ Governors 38 Automatic Full-Load Control-Rod Stop 38 Control-Rod Stop with Torque-Control Mechanism 40 Manifold-Pressure Compensator (LOA) 41 Altitude- Pressure Compensator (ADA) 36

43 Electric Speed-Control Device 43 Use 43 Design 44 44 44 45 47 49

Pneumatic Governor Variable-Speed Governor EP/M..

Operating Principle Operating Characteristics Special Designs Maintenance

50 Testing and Repair 52 Glossary of Technical Terms 55

Test Page

Quantity of fuel injected

Diesel Engine

In-Line Pump

CL (I)

C Q C C LU

Governor Control-rod travel

Starting fuel delivery

j;

Full-load delivery

Torque control

We provided information on inline pumps for you in the booklet in this series entitled "Diesel Fuel-Injection Pumps Types PE and PF". The in-line pump, however, is only one part of the fuel injection system. Equally important is the governor. This device is responsible for ensuring that the engine maintains a certain speed under various load conditions, that the engine speed does not exceed a certain level as protection • against self-destruction, and that the engine does not stop during pauses in loaded operation, i.e. during idling. The governor accomplishes all this by controlling the amount of fuel injected into the engine. How the governor performs these as well as a number of other functions is described in this booklet.

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