[WapCar] In automobiles, a start-stop system automatically shuts down and restarts the internal combustion engine to reduce the amount of time the engine spends idling,thereby reducing fuel consumption and emissions.
Engine start and stop: When the vehicle is in a stopped state (not in a parked state), the engine will stop working (not the traditional idle speed hold). While the lubricating oil in the engine will continue to run to keep the engine lubricated; the engine will start again after releasing the brake pedal . At this time, the lubricating oil has been circulating, even frequent parking and starting will not cause abrasion inside the engine.
Automatic start-stop technology is gradually becoming popular. For cars equipped with this function, when the driver depresses the brake, the engine will automatically turn off after two seconds. When you want to go, release the brake and step on the accelerator, or turn the steering wheel slightly, and the engine will start again. This technology reduces emissions and fuel consumption by waiting for a short stop at traffic lights.
When the vehicle is at a standstill, the power required in the vehicle will be supplied by the AGM battery instead. The air-conditioning system consumed more power, will also be converted to an air supply mechanism. If the static time is too long, it will inevitably affect the cooling effect or cause the car to become sultry. Then we can manually turn off the start-stop system.
Four common forms of engine start and stop
1. Separate starter/generator start-stop system
This is the most common type of start-stop system. The starter and generator of this system are independently designed. The starter provides the power required for starting the engine, and the generator provides electrical energy for the starter. Bosch is the mainstream supplier of this kind of start-stop system. The system has fewer parts, is easy to install, the size of the system components is consistent with the traditional components, and the application threshold is low.
2. Integrated starter/generator start-stop system
The permanent magnet inner rotor and the single-tooth stator are used to excite the synchronous motor, then the drive unit can be integrated into the hybrid power transmission system. Valeo integrates the electronic control device of the i-Start system into the generator, when the engine stops at a red light, the car will automatically start the engine as soon as the gear is engaged or the brake pedal is released.
3. Mazda i-stop intelligent start-stop system
The i-Stop system, Mazda’s first start stop system, detects which piston is in the best position to restart quickest, which is the one in the combustion stroke phase, where air and fuel are in the cylinder, ready to be ignited. The mixture in this cylinder is ignited by the spark plug, forcing that piston down, and with assistance from the starter motor, results in a near instantaneous engine restart time of 0.35 seconds.
The traditional engine start-stop technology only relies on the starter to drive the engine to restart; while the i-stop technology uses mixed gas combustion to push the piston and the starter together to start the engine, which makes the starter power not necessary.
4. Coasting start-stop system
The current start-stop system can only shut down the engine when the vehicle is completely stopped, while the coasting start-stop system can shut down the engine when the vehicle is coasting (such as high-speed downhill). At the same time, using the control system to automatically control the clutch in automatic transmission models, that separates the engine from the transmission system to extend the sliding distance. When the driver operates the accelerator or brake pedal during coasting, the engine will start quickly.