Vehicle equipment and instruments Mercedes Vito 2 (W639)
Vehicle control system Modern cars have many systems that must be controlled in concert. The complexity of the interaction of various vehicle systems leads to the fact that the totality of...
Operating principle of CAN·multiplex network Three multiplexed data networks form the basis for the integrated control system of Vito Viano vehicles. Operating principle of CAN·multiplex network Previously used...
The principle of signal generation in a multiplex network VN 9.002 Complex signal in CAN data bus In normal transmission mode, data packets have the following block configurations (frames) (see fig. VN 9.002). The message data...
List of multiplex network components A1 instrument cluster A2/6 Multi-CD player A2/42 TV receiver A2/56 Radio and navigation unit A6n1 STH system control unit А35/11 SBS control unit A35/13 Telephone...
Communication between data buses Data bus communication is provided by the following control units. - Control unit of the management information system (N73) associated with tires (CAN B) And (CAN C). -...
Instrument cluster (A1) Although the instrument cluster (A1) connected to both multiplex networks CAN-B and CAN-C and exchanging information with them, this system is not a gateway. All control...
Front Universal Switching Unit The block is installed in the engine compartment. VN 9.004 Front Universal Switching Unit (NIC) (SAM) connected to the CAN-B multiplex network. This block receives,...
Functions of the SAM block The block controls the following functions. Outdoor Lighting (ABL). Interior lighting (IBL). Search for lighting devices and manage them. Formation of direction...
Engine management system Engines of the OM611 and OM 612 families are high-speed engines with direct injection of diesel fuel into the cylinders, which are equipped with various types of...
Fuel injection control Fuel is supplied by means of a fuel priming pump located in the receiving and measuring unit (MZ/Z) fuel tank. The pump is powered from the CDI control unit via the fuel...
Managing the amount of fuel injected In a direct injection system using TKVD (CDI) Controlling the amount of fuel injected is more important than in previous fuel injection technologies. When calculating...
Fuel injection pressure control The pressure in the TKVD is regulated by a valve (Y74), to which the pulse is applied (on-off) signal from the CDI control unit. The injection control unit receives data...
Driving injection control The main task of the CDI system in this mode is to provide the required value of engine torque, which is set by the position of the accelerator pedal. To do this, the...
Idle injection control The engine idle speed is maintained at approximately 600 rpm. In this mode, the block receives the following information. Message from the block (N73) whether the A/C...
Fuel pre-injection control function Pre-injection is activated when the amount of fuel calculated for injection in a given cycle is large (enough to divide the cycle into several stages). This mode...
Main injection control function The main injection is the second injection stage in the presence of a pilot injection. The cases of lack of pre-injection are described above. When calculating the main...
Final injection stage The final injection stage is mainly used to reduce the particulate content in the exhaust gas. The principle of determining injection parameters is similar to those...
Glow plug preheat function The glow plug preheating system is designed to achieve the required ignition temperature of the fuel mixture in the cylinder at the time of a cold start. In addition,...
Postheating The post-heating mode is designed to improve the starting characteristics of the engine, even out the operation of the engine during a cold start, and prevent the...
Boost pressure control function The boost pressure is determined by the speed of the supercharger turbine. Turbine speed control is based on signals from the CDL control unit boost pressure sensor...
Air-Fuel Ratio Definitions On vehicles with a PR number (MF4) the air-fuel ratio is also monitored by an oxygen sensor.
Exhaust gas recirculation (EGR) control On vehicles with PR codes (MG4) And (MF8) CDI system via CDI control unit (N3/9) and vacuum converter (Y31/5) controls the EGR valve (Y27), which regulates the addition...
Air supply cut-off control On vehicles with a PR number (MF4) the CDI control unit performs the function of activating the inlet air cut-off valve (Y83).
A/C Compressor Shutdown Control Function In vehicles equipped with automatic air conditioning (PR number HH9), when the engine speed is less than 2000 rpm and the signal intensity of the accelerator pedal...
Fuel supply system VN 9.007 1. TKVD; 2. Fuel tank; 3. Fuel filter; 4. Fuel temperature sensor 650; 5. Fuel pump combined with fuel level sensor IM3/3; 6. High pressure fuel pump M41; 7....
Functional diagram of motor control The CDI control unit analyzes the state of the system on the basis of a combination of signals from the sensors of the system. Below is a diagram that shows the signals...
Elements of the engine management system Electronic control unit. Electronic control unit (ECU). Multiplex network CAN C. Sensors Crankshaft position sensor. Camshaft position sensor. Air mass sensor. Inlet air...
Electronic Engine Control Unit (CDI ECU) CDI control unit (N3/9) controls the following functions. Fuel supply. Control of glow plugs when starting the engine and while driving. Controlling the amount of fuel...
Accelerator pedal position sensor (B37) Purpose Registration of the position of the accelerator pedal and transmission of information to the engine control unit. Design The accelerator pedal position sensor...
Crankshaft position sensor (L5) Purpose Determining the position of the crankshaft at a given time and transmitting a signal to the engine control unit. Placement and device The crankshaft position...
Camshaft Position Sensor (B6/1) Purpose Determination of the position of the camshaft in a non-contact way. Functioning VN 9.013 Speed signals (synchronization) engine; OT1. TDC of the 1st cylinder;...
Coolant temperature sensor (B11/4) Purpose Coolant temperature detection and signal transmission to the engine control unit. Accommodation VN 9.016 1. Pressure sensor in TKVD (В4/6); 2. Coolant...
Fuel temperature sensor (B50) Purpose Fuel temperature sensor (B50) placed in the injection pump (M41). If the fuel temperature is too high, then the pressure in the HPC decreases. Thus, the amount...
Charge air temperature sensor (B17/9) VN 9.023 1. Charge air temperature sensor B17/9 Purpose Determining the charge air temperature and transmitting a signal to the engine control unit. Design VN 9.024...
Boost pressure sensor (B5/1) Purpose Detection of air pressure in the intake manifold and signal transmission to the engine control unit (N3/9). Design The boost pressure sensor contains...
Fuel pressure sensor in TKVD (B4/6) VN 9.027 1. High pressure pipe supplying fuel to the fuel injection pump; 2. TKVD; 3. High-pressure fuel pipes supplying fuel from the TKVD to the injectors; 4. Fuel...
Oil Condition Sensor (B40) Purpose The oil condition sensor is designed to control the temperature, level and degree of oil contamination. If the oil level is too low, a signal is transmitted to...
Inlet oxygen sensor on the converter (G3/2) The oxygen sensor is designed to analyze the exhaust gas in order to determine the actual air / fuel ratio and correct the composition of the fuel mixture in the...
Air filter outlet pressure sensor (B28/5) Sensor (Q28/5) pressure at the outlet of the air filter measures the specified pressure and transmits a signal to the CDI control unit (N3/9). If the vacuum at the...
Actuators of the CDI control system Below is a description of the control devices of the CDI control system. This description does not include devices that are described in sections « Fuel supply system ».
Glow plugs (R9) The combustion chamber is preheated by glow plugs fed from the output stage of the preheating system. The duration of preheating depends on the temperature of the...
HP pressure control valve (Y74) Pressure control valve in TKVD (Y74) together with fuel control valve (Y94) maintains pressure at the level set by the CDI control unit (N3/9). The valve is screwed into...
Exhaust Gas Recirculation (EGR) Valve Actuator The EGR valve actuator is designed to open and close the EGR valve. This valve regulates the addition of a certain amount of exhaust gas to the incoming air. This is...
Electronic Stability Program (ESP) In a modern car, in particular in Vito Viano cars, a modern system is used to ensure vehicle stability in various driving situations. This system is called ESP and is...
Systems interaction The ESP function is the highest priority function among those listed due to the fact that its action is the most universal. This is expressed in the fact that in order...
Wheel speed sensors When the rotor rotates (5) due to the interaction of magnetic fields in the coil (3) voltage pulses are induced, the repetition rate of which is rigidly related to the...
Lateral acceleration sensor In the acceleration sensor (B24/2) there is an electronic microcircuit (A) to register a signal. The principle of measurement of the acceleration sensor is based on the...
Angular rate (yaw) sensor Hollow steel cylinder (sensing element, b) under the influence of piezoelectric elements, it begins to vibrate at a certain frequency. 4 pairs of piezoelectric elements...
Steering angle sensor Steering angle sensor (B24/8) located on the steering column. The sensor signal is proportional to the steering wheel angle. This signal is used to calculate the...
Hydraulic brake force control unit VN 9.059 5a. The brake mechanism of the right forward wheel; 5b. The brake mechanism of the left forward wheel; 6a. Brake mechanism of the right rear wheel; 6b. Brake...
Functioning of the ESP system ESP control mode VN 9.060 f. High pressure; g. pre-pressure The ESP control unit performs a braking control action to regulate the driving stability of the vehicle. At...
Brake Assist System (BAS): functional description Simulator studies with ordinary drivers and on the test track have shown that most drivers in the event of emergency braking, first of all, at the beginning of the...
Tire pressure monitoring system The tire pressure monitoring system is designed for operational control for traffic safety. Control can be carried out both at the request of the driver, and in the mode...