Chery Chery G5 cars are produced by a B-class car, the car high profile, equipped with a parking sensor, automatic wiper, headlamp washing device, power sunroof, dual zone automatic climate control and after the air conditioning system. Chery car uses self-developed 2.0T turbocharged engine, vehicle electrical system uses a CAN bus network communication system, to facilitate the readers understanding of the turbocharger system and the vehicle electrical system of the vehicle, in which two of us aspects briefly.
First, the engine system
Chery G5 SQR484B car equipped with a turbocharged engine type 2.0 T, where we introduce the main car turbocharger system.
1. The turbocharger arrangement
Chery G5 2.0T car equipped with an engine using the exhaust gas turbocharger, the turbocharger turbine wheel primarily, compressor housing, bearing cap, the compressor wheel, the turbine bypass control valve and the cover and other components, as its structural view (FIG. 1).
FIG 1
2. The turbocharger lubrication system
The maximum speed of the turbocharger up to 200,000 r / min or more, must be provided to the rotary shaft and the bearing adequate lubrication, the lubricating oil but also such a cooling effect, so that rotation of the turbocharger assembly can work at a temperature of 80 ~ 120 ℃.
the engine oil lubrication system as shown in (FIG. 2). Oil from the engine lubrication system at the oil pressure, the oil is delivered to a large number of intermediate shell, intermediate shell reassigned to the bearing. These regions form a large amount of oil, can rotate freely inside the bearing, the lubricating oil returned to the oil pan again by the turbocharger bearing.
FIG. 2
Cooling
3. The turbocharger system
Figure 3 [123 ]
when the engine starts, the turbocharger center bearing housing is cooled by the engine cooling system by a thermosiphon effect. In the hairAfter motive stopped about 5 min, when the turbocharger can not be cooled, it will reach the maximum temperature, due to lack of time caused by the oil flow turbocharger ldquo; hot dip rdquo; state, leading to the turbine booster ahead damage. To avoid this situation, the cooling circuit is provided (FIG. 3, FIG. 4) in the turbocharger system, in order to proceed with the turbocharger cooled after engine shutdown. When the engine is stopped, the electronic water pump coolant pump cooling water into the turbocharger, the key intermediate region of the turbocharger bearing housing is cooled, thereby reducing ldquo; hot dip rdquo; effect, by preventing the turbine pressure ahead damage.
Figure 4
4. The turbocharger system protection
Figure 5 [123 ]
the turbocharger system target supercharging pressure is calculated in accordance with the actual torque demand given by the engine control unit, turbocharger wastegate valve open (FIG. 5) by controlling supercharging pressure in the bellows and atmospheric pressure overcomes the spring force to control the pressure inside the bellows. When the bypass valve is closed, the pressure booster through the rise in the exhaust gas increases, so that we can improve the output torque of the engine in the low speed region. When the boost pressure reaches the engine control unit is set, the bypass valve is opened, a portion of the exhaust gas is discharged through the bypass air passage, the turbocharger speed drops, the supercharging pressure drop. Briefly, when the supercharging pressure is smaller than the set value, the bypass valve is closed; the other hand, the bypass valve is open.
The bypass valve is controlled by means of a connecting rod turbine exhaust valves, turbo compression once the boost value reaches a defined level of the inlet end, the inlet pressure will push link bypass valve, the turbine exhaust gas bypass valve to the open side, without a portion of the waste directly into the turbine wheel of the exhaust pipe. This reduces ldquo; blow rdquo; flow rate of the exhaust gas turbine wheel, the turbine impeller speed is reduced, while driving speed is reduced compressor wheel, the turbine boost pressure to maintain a stable value.
The turbo circulation system
Figure 6
When the engine is idlingOr shutdown condition when the throttle is fully closed or nearly completely closed, so that the turbocharger intake line will produce persistently elevated pressure (in this case the gas hardly flows), the turbine will be a great braking force. When the throttle opening, and hope turbocharger speed can be increased to work as soon as possible. To prevent over-pressurization, the designer uses a recirculation valve (FIG. 6, FIG. 7) technology. Pneumatic recirculation valve element, is achieved by a pneumatic actuating diaphragm spring open. When the degree of vacuum is large, the diaphragm spring is the intake valve is opened; otherwise, the recirculation valve is closed. As long as the throttle closed, the recirculation valve is formed in the charge line small cycles, so that the turbine can be avoided brake; re-open throttle, the intake manifold vacuum reduction, the recirculation valve in the diaphragm spring return, turned off, small circulation circuit is opened, the pressure regulator into the state.
Figure 7
Second, the vehicle electrical system
G5 car body, the electrical control system consists of the body unit BCM control, rear body The control unit TDM, the driver-side door control unit DDM, right front door control unit PDM, left rear and right rear door control unit LRDM control unit RRDM composition. The main body control module BCM control unit, the control unit the rest of the auxiliary control unit. G5 car uses a CAN bus system, which bus system as the network topology (FIG. 8).
Figure 8
1. The primary element
(1) BCM (FIG. 9)
FIG. 9
BCM function (before and after heating control unit includes a management injectors, rear window defroster, management exterior lights, fog lights management, management turn signal, an indoor lamp manage different ), the backlight control switch, a start signal is detected, an alarm is not pulling the key, and washed with a wiper managed rain sensor, mirror adjustment, the bonnet contact switch signal monitoring, signal monitoring tailgate open, horn control, rear window curtain motor control, electric window control, central locking control, fuel tank cap opening control, vehicle theft management, control door opening warning light, CAN communication function and self-diagnosis.
(2) TDM (FIG. 10)
10
The main functions include the TDM fuel tank cap opening control, luggage compartment lid opening control, lighting control of the luggage compartment, the fuel tank lid switch lighting, the fuel lid switch signal input, a switch illuminating tailgate, the tailgate switch signal input, controlling the dome, the dome light switch signal input, and the lamp control threshold CAN bus and LIN bus communication.
(3) DDM (FIG. 11)
11
the DDM features include driver side door open warning light control, driver the side door glass lift motor control, the driver side door lock motors control, the driver-side door mirror adjustment motor control, the driver-side door mirror defrosting heater wire control, the driver side door windows switch lighting control, the driver-side door glass down switch input signal, the driver’s door control switch illumination control, the driver’s door switch signal input in the control, and a mirror adjustment switch signal input CAN bus communication.
(4) PDM (FIG. 12)
12
the PDM features include right front door open warning light control, right front door window regulator motor control, control of the right front door lock motors, door mirror adjustment motor control right front, right front door mirror defrosting heater wire control, right front door window regulator switch lighting control, the right front door window regulator switch signal input and CAN bus communication.
(5) LRDM (FIG. 13)
FIG. 13
LRDM main features include left rear door opening warning light control, left rear door window regulator motor control, left rear door lock motor control, the left rear door windows switch lighting control, the left rear door window regulator and a switching signal input LIN bus communication.
(6) RRDM (FIG. 14)
FIG. 14
RRDM main features include a right rear door control door opening warning light, right rear door window regulator motor control, right rear door lock motor control, lighting and right rear door windows switch control, the right rear door windows switch signal LIN bus input and the communication.
2. The principle of the control part of the system
(1) After the windshield defroster system
After addition windscreen heater wire may be larger or humidity in winter weather or mist off the frosting on the glass, in order to help the driver maintain a clear rearward visibility. The system is with a few small resistance copper wire attached to the rear window, when energized by heat generated by the defrosting copper.
When the system before defrosting, the defrosting mirror also its longest defrosting time is about 20 min. When the air conditioner controller in the OFF mode can be started after defrosting function. After defrosting button is pressed, mirrors and start defrosting the windshield, and the associated after defrosting symbol is illuminated, while the internal timer to start the air-conditioning controller (20 ± 1) min is clocked. When the battery voltage drops to a time and maintains a minimum 11.5 V (5 ± 0.5) s, the air conditioning controller resets the defrosting signal to stop the mirror and the rear windshield defroster. But defrost timer continues to timing related defrost symbol is still illuminated. When the battery voltage rises 1 V (i.e., when reaches 12.5 V) and maintain a minimum (15 ± 0.15) s, a heating air conditioning controller signal again to restart the heating.
if any of the following conditions is met, the system will stop after defrosting function: ① When after opening the defrost function, the button is pressed again after defrosting; ②20 min to the measured time; ③ when the ignition switch to the OFF position.
As defrosting system control diagram (FIG. 15) FIG.
15
(2) wiper system
by a wiper motor wiper system, the wiper link mechanism, two scraping arm and blade, two washer nozzles, two nozzles headlamp washers, washing pots and wash pump, headlight washer pump, a wiper lever switch washing, rain sensor and electric heating wash nozzlesThermal components. The system includes a low-speed wiper function of the wiper, the wiper high-speed, automatic control according rain wiper, wiper automatic return, washed with water, and spray nozzle heating headlamp washers. The size of the BCM before rainfall can be automatically control the speed of the wiper. When big rainfall, faster; rainfall hour, slow down. Further, the driver can adjust the sensitivity of the size of rainfall by the MODE switch.
① rain sensor function
rain and light sensors mounted on the front windshield in front of the inside mirror to moisture on the windshield according to the light refraction principle, the sensor an integrated light emitting diode annular, the light emitting diodes emit infrared light through the windshield out of the light in the passenger compartment. If the glass in the dry state, the infrared light is reflected by the surface of the glass, so that the sensor is integrated in the center of the photodiode records a high light; if a wet glass, the optical properties of the glass surface will change the glass surface of the scattering caused by water drops occur, so the amount of reflected light is reduced, then filtered photodiode light also reduces (principle of astigmatism). Sensor to provide optimal wiper operation information to the prevailing conditions BCM, bright and clear so as to maintain the windshield at any time. Rain sensor optical element, the operating wavelength in the infrared band.
② before washing
When the combination switch gear washed, washing machine before washing BCM command windshield.
③ washed headlamp (IGN-ON)
When the headlamp switch is opened and the washing composition stop, the system may be washed headlamp, the headlamp washing time is 1 300 ms ± 65 ms.
④ nozzle heating
If the ambient temperature is below 2 ℃, and the ignition switch to the ON position, the BCM begins heated nozzle, a maximum heating time was 20 min; if the temperature rises to 4 ℃ the system stops heating. During the function is activated, if the battery voltage is below 11.5 V for at least 5 s, the system stops heating; If the battery voltage up to 12.5 V, and for at least 15 s, then the system will resume heating. If no external temperature signal, The BCM nozzle will not be heated. Further, when the engine starts, the nozzle heating function is temporarily closed.
16
The control principle of the wiper system (FIG. 16) FIG.
(Luyao)