4d56 мануал скачать бесплатно

10, Operation Section 1 – 5 (1) Sensors • Detect the engine and driving conditions, and convert them into electrical signals. (2) Engine ECU • Performs calculations based on the electrical signals received from the sensors, and sends them to the actuators in order to achieve optimal conditions. (3) Actuators • Operate in accordance with electrical signals received from the ECU. Injection system control is undertaken by electronically control- …

40, Operation Section 1 – 35 12. FUEL INJECTION RATE CONTROL 12.1 Outline z While the injection rate increases with the adoption of high-pressure fuel injection, the ignition lag, which is the delay from the time fuel is injected to the beginning of combustion, cannot be shortened to less than a certain value. As a result, the quantity of fuel that is injected until main ignition occurs increases, resulting in…

11, Operation Section 1 – 6 3. SUPPLY PUMP 3.1 Outline z The supply pump consists primarily of the pump body (eccentric cam, ring cam, and plungers), SCV (Suction Control Valve), fuel temperature sensor, and feed pump. z The two plungers are positioned vertically on the outer ring cam for compactness. z The engine drives the supply pump at a ratio of 1:1. The supply pump has a built-in feed pump (trochoid type), and draws the fuel from the fuel tank, sending it to the plunger c…

24, Operation Section 1 – 19 solenoid valve is pushed downward, effectively closing the outlet orifice. For this reason, the hydraulic pressure that is applied to the command piston causes the nozzle spring to compress. This closes the nozzle needle, and as a result, fuel is not injected. (2) Injection • When current is initially applied to the solenoid, the attraction force of the solenoid pulls the solenoid valve up, effectively opening the outlet orifice a…

34, Operation Section 1 – 29 (2) Maximum Injection Quantity • This is determined based on the basic maximum injection quantity determined by the engine speed, and the added corrections for in- take air pressure. (3) Starting Injection Quantity • When the starter switch is turned ON, the injection quantity is calculated in accordance with the starting base injection volume. The base injection quantity and the inclination of the quantity increase/decrease change in accordance wit…

17, Operation Section 1 – 12 (1) SCV Opening Small (Duty ON time long — Refer to the «Relationship Between Actuation Signal and Current» Diagram.) • When the opening of the SCV is small, the fuel suction area is kept small, which decreases the transferable fuel volume. (2) SCV Opening Large (Duty ON time short — Refer to the «Relationship Between Actuation Signal and Current» Diagram.) • When the opening of the SCV is…

37, Denso 4D56 Operation Section 1 – 32 11. FUEL INJECTION TIMING CONTROL 11.1 Ouline z Fuel injection timing is controlled by varying the timing in which current is applied to the injectors. 11.2 Main and Pilot Injection Timing Control (1) Main Injection Timing • The engine ECU calculates the basic injection timing based on the engine speed and the final injection quantity, and adds various types of corrections in order to determine the optimal main injection tim…

45, Operation Section 1 – 40 P1203 Low charge Engine ECU Engine ECU Yes P1204 Over charge Engine ECU Engine ECU Yes P1210 Throttle valve opening malfunction Actuator malfunction Throttle valve Yes Only 4D56 Engine 2WD P1272 P/L open valve abnormality Fuel pressure control system abnormality Rail Yes P1273 Single pump abnor- mality diagnosis Fuel pressure control system abnormality Supply pump Yes In the event that the vehicl…

9, Denso 4D56 Operation Section 1 – 4 2.5 Operation (1) Supply Pump (HP3) • The supply pump draws fuel from the fuel tank, and pumps the high pressure fuel to the rail. The quantity of fuel discharged from the supply pump controls the pressure in the rail. The SCV (Suction Control Valve) in the supply pump effects this control in accordance with commands received from the engine ECU. (2) Rail • The rail is mounted between the supply pump and the injector, and stores the high-pressure fuel. (3) Inje…

30, Operation Section 1 – 25 8.6 Electronic Control Throttle (1) Outline • The suctioning of air is stopped through interlocking the intake throttle with the key switch in order to reduce engine vibration when the vehicle is turned off. Q001260E Engine ECU EFI Main Relay Airflow Meter Power Supply VG +B EVG IC THA E2 Intake Air Voltage Detection Voltage Detection Power Supply Intake Air Temperature Sensor Heat…

14, Operation Section 1 – 9 3.5 Operation of the Supply Pump z As shown in the illustration below, the rotation of the eccentric cam causes the ring cam to push Plunger A upwards. Due to the spring force, Plunger B is pulled in the opposite direction to Plunger A. As a result, Plunger B draws in fuel, while Plunger A pumps it to the rail. Q001234E Plunger A Ring Cam Plunger B Feed Pump
…

20, Denso 4D56 Operation Section 1 – 15 6. RAIL COMPONENTS PARTS 6.1 Rail Pressure Sensor (Pc Sensor) z The pressure sensor detects the fuel pressure of the rail, and sends a signal to the engine ECU. The sensor is made from a semicon- ductor that uses the Piezo resistive effect to detect changes in electrical resistance based on the pressure applied to the elemental sili- con. In comparison to the old model, this sensor is compatible with high pressure. 6.2 Pressure limite…

18, Operation Section 1 – 13 (3) Diagram of Relationship Between Actuation Signal and Current (Magneto motive Force) 4.3 Fuel Temperature Sensor z Detects the fuel temperature and sends a corresponding signal to the engine ECU. Based on this information, the engine ECU calcu- lates the injection volume correction that is appropriate for the fuel temperature. Q001116E Average Current Difference Small Suction Volume Large Suction Volume Actuation Voltage…

4, Table of Contents Operation Section 1. PRODUCT APPILCATION INFOR- MATION 1.1 Application ………………………………………….. 1-1 1.2 System Components Part Number …………. 1-1 2. OUTLINE OF SYSTEM 2.1 Common Rail System Characteristics …….. 1-2 2.2 Features of Injection Control………………….. 1-2 2.3 Comparison to the Conventional System…. 1-3 2.4 Composition ………………………………………… 1-3 2.5 Operation …………………………

33, Operation Section 1 – 28 10. FUEL INJECTION QUANTITY CONTROL 10.1 Outline z This control determines the fuel injection quantity by adding coolant temperature, fuel temperature, intake air temperature, and intake air pressure corrections to the basic injection quantity. The engine ECU calculates the basic injection quantity based on the engine operating conditions and driving conditions. 10.2 Injection Quantity …

49, Operation Section 1 – 44 Terminal Connections (2) No. Pin Symbol Signal Name No. Pin Symbol Signal Name A21 TWV4 Injection 4 Drive (#2 Cylinder) A57 — — A22 TWV4 Injection 4 Drive (#2 Cylinder) A58 — — A23 TWV2 Injection 2 Drive (#3 Cylinder) A59 — — A24 TWV2 Injection 2 Drive (#3 Cylinder) A60 — — A25 — — A61 — — A26 A/C R Air Conditioning Relay A62 — — A27 C FAN R FAN Relay A…

28, Operation Section 1 – 23 8.3 Cylinder Recognition Sensor (TDC) z Outputs a cylinder identification signal. The sensor outputs 5 pulses for every two revolutions (720°CA) of the engine. 8.4 Turbo Pressure Sensor z This is a type of semi-conductor pressure sensor. It utilizes the characteristics of the electrical resistance changes that occur when the pressure applied to a silicon crystal changes. Because a single sensor is used to measure both turbo pressure an…

21, Denso 4D56 Operation Section 1 – 16 7. INJECTOR (G2 TYPE) 7.1 Outline z The injectors inject the high-pressure fuel from the rail into the combustion chambers at the optimum injection timing, rate, and spray condition, in accordance with commands received from the ECU. 7.2 Characteristics z A compact, energy-saving solenoid-control type TWV (Two-Way Valve) injector has been adopted. z QR codes displaying various injector characteristics and the ID codes showing these in numeric form (30 alphanumeric …