发电机与蓄电池匹配

Volvo Bus Corporation

Gothenburg, Sweden

Bodybuilding Instruction

Buses and coaches

Sect.

Group

No

Date

3019060518

Electrical power consumption

Applies to all models

General

Current drain must be limited during idling and when the engine is switched off,to increase the service life of the batteries. For this reason, the body builder must dimension the body electrical system using the tables below for guidance.

Action

Idling

Chassis current drain is shown in the table below 1. The values apply to idling at 600rpm unless otherwise specified. If the outdoor temperature is greater than -5°C, it is possible to ignore the current needed to heat the AdBlue hoses.Chassis current requirements

3-0-19 R01

Max current consumption at idle •

At idle, the total current consumption for the body and chassis together must not be greater than the charge received by the batteries, please refer to the table 2. NOTE! The charge values in the table must therefore be reduced by the current requirement in table 1. In exceptional cases, short term loading on the batteries can be permitted, however.

NOTE! At low idling speed, the charging capacity falls dramatically.

Bus model

Current required for heating the AdBlue hoses at temperatures below -5°C (Euro 4 engines)Current required for pump sensors etc. when the SCR system is used (Euro 4 engines)Current required for battery

charging, control units, instrument lighting etc.B7R B7LE 10A 10A 20A B9L B9TL B9S 20A 10A 20A B12B 6x228A 10A 20A B12B 4x225A 10A 20A B12M B12MA

19A

10A

20A

Table 1. Chassis current requirements

Model

Alternator a

Ratio

Charge current at idle

(600rpm)

Total charge current at idle Charge current at ambient temperature B7R/B7RLE MkII

80 A 1:4.560 A 90ºC Engine mounted

2x80A 1:4.5120 A 25ºC 2x110A

1:4.5160 A 25ºC B7R/RLE MkIII 2x100 A

1:3.3

92 A

90ºC

B7L

115 A 1:2.8105 A ---25ºC

Idle speed for B7L and B7TL is 700rpm

140 A 1:2.8100 A 180 A 1:2.8135 A 140+80 A

1:2.8 and

1:3.7

150 A B7TL 115 A 1:2.9105 A 140 A 1:2.9100 A 180 A

1:2.9135 A B9L 2x80 A 1:5.2108 A 90ºC

2x80 engine mounted 2x110 A 1:5.2156 A 234 A

90ºC

110 engine mounted 110 A

1:5.11

78 A

Mounted on AC

compressor

B9TL 2x80 A 1:5.2108 A 90ºC 2x80 engine mounted 2x110 A

1:5.2

156 A

219 A

90ºC

2x110 engine mounted 110 A 1:463 A

110 on auxiliary bridge

2x180 A 1:2,9230 A ---25ºC

Table 2. Max current consumption at idle