Roewe 350 SAIC recently launched an A-Class, it is equipped with a 1.5 L NSE VCT engine with an automatic transmission and Aisin 81-40LE SSG or 5-speed manual transmission, and uses a speed-dependent power steering system , a series of booster and a dual airbag security configuration than the brake system. Moreover, the Roewe 350 is a car into the 3G concept, it inkaNet system configured to combine a 3G network with mobile communication technology, it gives the driver a wealth of traffic connected life. In order for readers to understand the car, the paper highlights the main technical car briefly.
First, the engine system
1.5 L NSE VCT engine electrical control characteristic aspect, is the use of an engine control system ME7.9.1 Bosch, ETC8 integrated electronic throttle VCT and a continuously variable valve timing system, the mechanical feature is the use of double-layered cooling system and mute timing chain drive.
1 electric main components of control system
(1) coolant temperature sensor the ECT (FIG. 1)
[ 123]
FIG 1
①ECT attached to the rear end of the 4-cylinder engine head intake manifold just above, it not only provides a temperature signal to the engine control unit the ECM, ECM through cAN bus ECT signal to instruments (thermometer for instruction) transmitted to the vehicle body control unit (control time for the heated rear window), but also transmitted to the transmission control unit.
② If the ECM does not detect the ECT signal or a value outside the range, the ECM uses a default value, sustained high-speed operation of the cooling fan, temperature gauge indicates low temperature, an engine temperature warning light lighting and stores fault codes.
(2) intake pressure / temperature sensors the TMAP (FIG. 2)
FIG. 2
[ 123]
TMAP is attached to the intakeThe rear end of the manifold (rear throttle), if the intake air temperature signal failure, the engine control unit ECM default value is used instead of 45 ℃, the driver does not perceive the situation immediately, but ECM stored fault codes. Intake air temperature sensor signal voltage increases as the intake temperature decreases, the intake air temperature sensor signal as the intake air temperature at 10 deg.] C is about 2.9 V.
(3) an accelerator pedal position sensor the APP (FIG. 3)
Figure 3
APP is attached to the lower left dashboard, connected with the mechanical accelerator pedal, a throttle opening degree of the ECM by the control signal of APP. APP has two internal potentiometers APP1 and APP2 position sensors, each sensor circuit 3, comprising 5 V reference voltage circuit, a ground circuit and a signal circuit. The voltage value of the sensor with the pedal stroke increases, the voltage value of the signal are both half APP1 APP2 in any travel conditions. The accelerator pedal position is 0%, voltage APP1 is about 0.78 V, the voltage value of APP2 is about 0.39 V; 100% when the accelerator pedal is in position, the voltage value of the APP1 is about 4.0 V, the voltage value of about 2.0 APP2 V.
(4) the ETC electronic throttle (FIG. 4)
Figure 4
[ 123] ①ETC portion 2 mainly consists of a throttle position sensor and throttle motor TPS composition, wherein a non-contact electronic sensor TPS sensor, throttle motor is a DC motor. Throttle position sensor consists of two inverted signals TPS1 and TPS2 composition meter, a reflecting position of the throttle valve opening forward, one reverse reflecting throttle opening position.
voltage value of the signal
②TPS1 increases as the throttle opening increases, TPS2 signal voltage value increases as the throttle opening decreases. When the throttle valve is not operated, the signal voltage TPS1 is about 0.77 V, the voltage signal TPS2 is about 4.23 V, the voltage value of both signal andAlways is 5 V.
(5) CKP crankshaft position sensor and the camshaft position sensor CMP (FIG. 5)
Figure 5 [ 123]
①CKP CMP and a Hall effect sensor, CKP is located on the rear portion of the engine block, the cylinder head is attached to the CMP upper intake manifold side. CKP crankshaft position is determined by the notch on the target wheel integral with the flywheel, CMP exhaust camshaft gear ring detection signal.
② CMP signal can be detected by the following manner. Removal CMP, turn the ignition switch, not place any object in front of the CMP, CMP signal measured at this time was observed to be a high potential of 12 V. CMP screwdriver placed in front of the
the class of iron element, and then observed at this time the detection signal may be observed low potential 0 V due to.
(6) an ignition coil (FIG. 6)
Figure 6
using two double ignition coil, a spark plug is located above the ignition coil, each coil is connected to a spark plug, so that two cylinders (1 and 4, 2 and 3) will be fired simultaneously. A cylinder in a compression ignition stroke is effective, while in the ignition cylinder exhaust stroke ignition is invalid.
(7) the oxygen sensor and the knock sensor KS HO2S
① knock sensor is in the third position of the cylinder of the cylinder block mounted torque to 25 N? m, it must be strictly observed during installation.
② There are two oxygen sensors of the engine, which are located before and after the three-way catalyst, wherein the oxygen sensor after a major role in the conversion efficiency of detector is a three-way catalyst. If the oxygen sensor signal waveforms before and after the same, then the three-way catalyst conversion efficiency has been lost.
Figure 7
(8) a hydraulic variable timing control solenoid valve (FIG. 7) and phase adjuster (FIG. 8)
Figure 8
meaning
the VCT system is variable camshaft timing system adjustment, when the apparatus is adjusted by changing the valve timing cam phase.
① hydraulic control solenoid valve installed in the intake side camshaft camshaft cover 1 watt, is a three-way valve, including an oil inlet, an oil return port and two studio. Hydraulics Roewe 550 1.8DVVT different engine control valve, hydraulic control valve 1.5VCT engine oil inlet is at an end.
FIG. 9
② hydraulic pressure control valve has a cylinder head oil inlet one-way valve (FIG. 9), the interior of the regulator valve prevents phase is refluxed to the oil pan under the action of gravity when the engine is stopped, thereby avoiding adjusting the internal phase can not affect the oil-filled promptly upon restart normal operation.
③ phase adjuster 2 and the rotor into the stator portion. The rotor and the cam shaft through the hollow bolts, the stator is driven by a timing chain.
2. The main components of the fuel system
(1) pump
pumps, hydraulic regulator and fuel filter is located in the middle of the tank, the fuel level sensor signal of the inside of the tank directly into the instrument. The fuel pump is a vane pump driven by a DC motor, the rated working oil pressure is 380 kPa, the battery power to the electric fuel pump through the engine compartment located R8 pump relay fuse box, the relay is operating at engine starting operation.
(2) injector
positioned between the injector and the fuel rail intake manifold, according to the engine control unit ECM the injection instruction in order 1,3,4,2. Inside the injector solenoidResistance is 13 ~ 16 Omega; (20 ℃). Providing 12 V power injector by the main relay, ECM controls the injector solenoid coil is grounded. Full Waveform Analysis injector a working cycle (FIG. 10), which represents the injector is not operating, when a low potential (i.e., between the time scale in FIG. 2) represents the injector working, the scale 2 when a high potential the time between the present time the working cycle of the injector, i.e. 4.18 ms. FIG high potential represented at block inductance electromotive force generated when the solenoid is de-energized.
10
Second, the body electrical
1. Data bus [ 123]
each system control Roewe 350 sedan equipped with only one type of data between bus units, i.e., a high speed CAN bus. Between the engine and the automatic air-conditioning control unit and the control unit has a diagnostic socket K dedicated diagnostic bus, this line is connected to the diagnostic socket pin 7, located above the diagnostic socket (FIG. 11) of the accelerator pedal.
FIG. 11
(1) CAN bus comprises a CAN-L bus and the CAN-H bus 2 harness (FIG. 12 ), CAN-L signal bus between 1.5 ~ 2.5 V switching, CAN-H bus signal switches between 2.5 ~ 3.5 V, so that a voltage difference between the two wire harness, so that they are at 0 V ( handover between logic 1) and 2 V (logic 0), to produce a digitized signal.
12
(2) Color CAN-H bus yellow / black, connected to the diagnostic socket No. 6 foot; CAN-L bus color yellow / brown, pin 14 is connected to the diagnostic socket. CAN bus termination resistor is located in body control module BCM and an engine control unit in the ECM, is a resistor 120 Omega ;, if measured between the pin No. 6 of the diagnostic socket and pin resistance 14, the resistance should be 60 Omega ;.
(3) all control units on the CAN bus are connected in parallel, wherein if a control unit is disconnected, the other control units can continue to communicate.
2. The vehicle body control unit the BCM (FIG. 13)
13
[123 ] (1) the vehicle body control unit 2 is bolted to the bottom left of the instrument cluster, which is mounted on the shift lever lock relay. Body Control wire harness connection plug FC010A four different functions on the display unit, FC010B, FC010D and FD010E, vehicle body control means providing an input signal / output services.
(2) the body control module BCM functions: data transfer switching center, transport management mode, window lifters, windscreen wipers and washed with water, lights, central locking system, vehicle body alarm system, an immobilizer system, vehicle information storage, heated rear windscreen and diagnostic functions. In addition, the BCM also controls the generator load management, and transport key code function mode switching functions.
3. The inertia switch (FIG. 14)
14
[ 123]
inertia switch on the right side of the engine compartment, a switch mounted vertically, with a reset button on its top surface. Inertia switch a security measures after the accident. After the inertia switch disconnects if the vehicle collision, the impact speed reaches the set value, the control unit body BCM receives inertia switch off signal, while the following features: the power off fuel pump, lighting of the interior lamp, hazard warning lights lights and the door unlocked.
4 intelligent window motor (FIG. 15)
15
[123 ] motor driver’s side window is a smart window motor, or a direct drive motor can be operated by the operating current of the motor fault diagnostic detection, the motor up and down the window memory dead center position.
(2) RF (radio frequency) receiver located in the BCM, fob receiving radio frequency signals and to cancel the modulation signal, a signal output resistance within the BCM allows up to 12 V.
This switch is a non-self-locking switch. When the switch is pressed, its contact is closed. BCM receives a signal different resistance moment, and this signal is interpreted as the lock or unlock request.
5. Burglar alarm indicator (FIG. 16)
16
[123 ] burglar alarm indicator is located below the engine tachometer, by the indicator status signal line controlled by the BCM. Maintenance can be performed by simulating various fault central locking state, while observing the blinking manner of the indicator. Always mdash; mdash; central locking switch is locked after use; Off mdash; mdash; unlocked, the remote lock error; fast flashing mdash; mdash; with the remote / mechanical key is locked; flashing slowly mdash; mdash after 10 s with the remote locking / mechanical key;; flashing speed mdash; mdash; if the driver’s door is closed, the other door, bonnet or tailgate is not closed, the lock switch lock using internal locking the vehicle.
6. Decklid release switch (FIG. 17)
17
[ 123] (1) in the left front door trim panel. When the door is unlocked, the vehicle speed is less than 8 km / trunk lid can be opened by pressing the release switch h. In the vehicle speed is zero and the ignition switch is turned off premise, press the ON key on the remote decklid key is greater than 1 s, the tailgate can be unlocked.
18
(2) emergency opening tailgate cable located inside the luggage compartment cover right rear side (FIG. 18 ). Pry hand grip cable pulling cable emergency opening the tailgate, the tailgate can be opened from the luggage compartment.
(Yang Zuotao)