JackBrake engine brake is a set of vehicle deceleration equipment. Its main working principle is to change the valve timing of the engine exhaust valve to make the vehicle slow down. At the end of the compression stroke, the exhaust valve is opened so that the work done by the engine while compressing the air in the cylinder is released to the exhaust system, energy is not returned to the piston, the momentum of the vehicle passes through the wheel and the transmission system. Passed to the engine, and become the only driving force of the anti-drag engine.
Essentially, the JackBrake device's role is to turn an energy-generating diesel engine into an energy-absorbing air compressor. This change is implemented by a set of electronically controlled hydraulic equipment, which is triggered by current and completed under hydraulic lock-up conditions. The engine braking device can be mounted on the cylinder box, or it can be built into a rocker arm system and mechanically touched by the rocker arm of the engine. If the power switch on the instrument panel is in the on position, the driver only needs to engage the clutch. Release the accelerator pedal and the engine brake will start immediately. When the driver uses the service brake, the engine braking device will also maintain its braking effect, so that under the combined effect of the JackBrake engine braking device and the vehicle service brake, the vehicle will achieve the maximum deceleration effect.
If the power switch is on and the engine electronic control determines that engine braking should be performed, the voltage supply to the engine brake solenoid will be ready to start the brake at any time. When the driver releases the accelerator pedal and the clutch is engaged, the engine brake solenoid valve immediately applies a voltage. After the solenoid valve is energized, the valve opens, the engine oil flows into the control valve, the control valve is pressurized upward, and its internal ball valve Leave the seat so that the oil flows into the primary and secondary circuits. The main piston is under pressure and starts to move outwards. It touches the rocker arm. The camshaft rotates and the rocker lifts. The main piston is pressed back into the housing so that the oil in the brake is pressed back to the control valve and the ball valve returns to the valve seat. Hydraulic locks are formed in the device. A sealed hydraulic passage is now formed between the primary and secondary pistons. Therefore, as the main piston moves, the secondary piston will make a synchronous response.
The forward and backward movement of the rocker is the ultimate factor in controlling the exhaust valve. When the engine speed is 2100 rpm, the rocker moves 17 times per second. This is the reason that the unique sound from the exhaust system is transmitted during engine braking. If you hear this sound, it means that the engine has become an air compressor that absorbs energy. The work done by the engine while compressing the air in the cylinder is released to the exhaust system, and the energy is completely released and does not return to the engine. The impulse of the vehicle is transmitted to the engine by the wheels and the transmission system and the engine is reversed. The above cycles are repeated continuously, the kinetic energy of the vehicle is continuously absorbed, and the vehicle speed is thus reduced. Once the driver depresses the clutch pedal or depresses the accelerator, the voltage of the solenoid valve is immediately interrupted, and the supply pressure drops, so that the inner spring of the control valve is sufficient to return it to its original position, and the remaining oil in the primary and secondary circuits is then pressed out. In the absence of oil pressure, the brake piston will leave the rocker and the valve, the brake will be deactivated and the deactivation process will be completed instantly.
Reluctance motor is a kind of small power Synchronous Motor, which uses torque of rotor to generate torque, also called reactive synchronous motor. A continuous running electrical transmission device, its structure and working principle is very different from the traditional AC and DC motors. It does not depend on the interaction of the magnetic field produced by stator and rotor winding currents, but relies on the minimum principle of magnetic resistance to generate torque. The so-called "minimum reluctance principle", namely: "always along the magnetic flux path closed minimal, resulting in the formation of magnetic force and electromagnetic torque" and "magnetic reluctance nature has to shorten the flux path to reduce the increase of magnetic reluctance and nature".
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