6.3 Starting System
Figure 6-7 Starter motor with planetary reduction gears.
Figure 6-8 Exploded view of a typical starter
Relays are used to direct large current flows that might overheat and damage a switch, they are a type of solenoid switch that closes electrical contacts. Most of relays are usually contained in relay block and junction block (J/B).
6.1 Lead Acid Battery and Circuit protection devices
Figure 6-2 Location of use block, relay block and junction block in a passenger car
Chapter 6 Automotive Electrical and ElectronicSymbol
Name
Abbraviation
Fuse
Fuse
Medium current fuse
M-Fuse
High current fuse
H-Fuse
Fusible link FL
Circuit breaker
CB
Chapter 6 Automotive Electrical and Electronic Systems
Chapter 6 Automotive Electrical and
Electronic Systems
6.1 Lead Acid Battery and Circuit protection devices 6.2 Charging System 6.3 Starting System 6.4 Ignition Systems 6.5 Lighting System 6.6 power window system 6.7 Supplemental Restraint Systems 6.8 Cruise control systems 6.9 Anti Theft Systems 6.10 Air Conditioning
6.1 Lead Acid Battery and Circuit protection devices
Figure 6-3 Location of use block, relay block and junction block in a van
Chapter 6 Automotive Electrical and Electronic Systems
A circuit may be protected by a special wire that acts as a fuse. This wire is called a fusible link.
A Circuit breaker feeds current through a bimetallic strip and a set of points to the remainder of the circuit. When the current exceeds the breaker’s rating, the bimetallic strip heats and bends to separate the points. Once it cools, it will close the circuit.
6.2 Charging System
Figure 6-5 Exploded view of a typical alternator (with voltage regulator)
Chapter 6 Automotive Electrical and Electronic Systems
6.3 Starting System
Chapter 6 Automotive Electrical and Electronic Systems
6.1 Lead Acid Battery and Circuit protection devices
electrochemical overload fusible relay bimetallic strip
remainder
exceed
New Words
[i¸lektrəu'kemikəl] a.电化（学）的
['əuvə'ləud] ['fju:zəbl] ['rilei] [¸baimi'tæ lik] [strip]
[ri'meində]
[ik'si:d]
n.超载，过载，过负荷 a.易熔的，可熔化的 n.继电器 a.双金属的 n.条，带 n.剩余物，其余的人；a. 剩余的 v.超过，胜过
6.2 Charging System
rotation alternator regulator rectifier explode
New Words
[rəu'teiʃən]
n.旋转
['ɔ:ltəneitə]
n.（交流）发电机
['regjuleitə]
n.调节器，调节阀
['rektifaiə]
n.整流器
Chapter 6 Automotive Electrical and Electronic Systems
6.2 Charging System
Figure 6-4 Components of a typical AC generator
Chapter 6 Automotive Electrical and Electronic Systems
Figure 6-1 Battery construction
Chapter 6 Automotive Electrical and Electronic Systems
6.1 Lead Acid Battery and Circuit protection
devices
Table 6-1 Circuit protection devices used for Toyota automotive wiring diaghrams
New Words
armature energize chrome
['ɑ:mətjuə] n.转子，电枢 ['enədʒaiz] v.供给...能量，激励，励磁，通电 [krəum] n.铬
Modern internal combustion engines are started by using electric starting motor, or starter (Figure 6-6, 6-7 and 6-8). A starting system consists of battery, ignition switch, starter relay and starter. To energize the starter, the ignition switch is turned to START, which completes an electrical circuit. When the starter begins to turn the starter gear moves out and engages the ring gear, which spins the crankshaft.
Chapter 6 Automotive Electrical and Electronic Systems
6.1 Lead Acid Battery and Circuit protection
devices
All of the vehicle fuses are usually contained in a holder called fuse block or relay block (Figure 6-2 and 6-3).
[iks'pləud]
v.爆炸，爆破
The charging system uses the rotation of the engine to create electricity. The electricity recharges the battery and provides power to operate the various vehicle electrical systems. The modern vehicle charging system consists of alternator and voltage regulator (Figure 6-4 and 6-5).
Chapter 6 Automotive Electrical and Electronic Systems
6.1 Lead Acid Battery and Circuit protection
devices
6.1.1 lead-acid storage battery A lead-acid storage battery (Figure 6-1) is an electrochemical device that produces voltage and delivers electrical current. The battery is the primary "source" of electrical energy used in vehicles today. When charging, the battery converts electricity into chemical energy, and when discharging, it converts chemical energy into electricity, producing a current. 6.1.2 Circuit protection devices It is necessary to protect electrical circuit against shorting (accidentally touching ground) that could burn up the wiring. Electrical units must be protected against overloads also. In circuits, Circuit protection devices must be installed in series with the electrical devices or wiring to be protected. The common types of circuit protection devices are fuse, fusible link and circuit breaker, see Table 6-1.