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Overview
Work electronic automatic transmission in the block with the main transfer is divided into three systems: electronic control gear, hydraulic control mechanism and the mechanism of transmission (including a torque converter). Receiving signals from the switches and sensors in the input system, electronic control unit electronic control mechanism (PCM) produces a signal that coordinates the existing traffic conditions with a linear solenoid, switching solenoids and solenoid duty cycle of the hydraulic control mechanism. In turn, the hydraulic control device, receiving signals from the PCM switches the fluid passages in the valve body and controls the clutch engagement pressure.
| Fig. 3.71. Block diagram of an automatic transmission FN4A-EL car Mazda 3: 1 - transmission mechanism; 2 - hydraulic control mechanism; 3 - electronic control mechanism; 4 - the torque converter; 5 - clutch, brake; 6 - planetary gear; 7 - differential; 8 - valve body; 9 - switching solenoids D, E; 10 - pressure control solenoid (linear type); 11 - shift solenoids A, B, C (solenoid duty cycle); 12 - the oil pump; 13 - PCM; 14 - oil pressure sensor; 15 - the vehicle speed; 16 - the temperature of the working fluid in the transmission; 17 - rotational speed of the forward clutch drum; 18 - speed of rotation of the crankshaft of the engine; 19 - Throttle Position; 20 - clutch, the brake pressure off; 21 - power flow; 22 - hydraulic pressure control signal; 23 - an electronic signal; 24 - Wheel
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The line pressure is regulated by a linear solenoid. Hydraulic switching channels switched by solenoids (switching solenoids D and E), the clutch engagement pressure is controlled solenoids operating cycle (switching solenoids A, B, and C) (cm. Fig. 3.71). The mechanism of transmission of the driving force from the engine is transmitted through the torque converter to the gearbox in unit with the main gear.
| Fig. 3.72. The cross section of an automatic transmission FN4A-EL car Mazda 3: 1 - torque converter; 2 - the oil pump; 3 - forward clutch; 4 - planetary forward gear; 5 - planetary reverse gear; 6 - clutch 3-4; 7 - coupling the reverse gear; 8 - 2-4 brake band; 9 - brake and reverse gear downshift; 10 - one-way clutch; 11 - a gear input shaft; 12 - a gear wheel of a secondary shaft; 13 - drive pinion; 14 - Differential
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Driving force is transmitted controls each clutch and brake according to the clutch engagement pressure solenoid duty cycle. Planetary transmission change gear ratio to optimize the driving force. Next, the driving force is transmitted through the differential to the wheel drive shaft, and then - the wheels.
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