Control method and system for electronic supercharger of vehicle and vehicle

Abstract

The invention provides a control method and system for an electronic supercharger of a vehicle and the vehicle. The control method comprises the steps of acquiring needed torque of an engine and obtaining needed supercharging pressure of the engine according to the needed torque; determining exhaust energy according to the exhaust gas temperature and exhaust volume of the engine; obtaining the optimal increment of an expected rotating speed of a turbosuperchager according to the current rotating speed and the exhaust energy of the turbosuperchager; obtaining the optimal increment of a final expected rotating speed according to a rotating speed limiting value and the optimal increment of the expected rotating speed; obtaining supercharging pressure of the turbosuperchager according to needed air inflow and the optimal increment of the final expected rotating speed; and determining supercharging pressure of the electronic supercharger according to needed supercharging pressure and the supercharging pressure of the turbosuperchager so that the electronic supercharger can be controlled. The method can effectively improve the acceleration performance of the vehicle, and has the advantages of energy conservation and emission reduction.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a control method and system for an electronic supercharger of a vehicle, and a vehicle. Background technique [0002] At present, the engine of the vehicle is supercharged by means of a turbocharger, which can improve the acceleration performance of the vehicle to a certain extent. However, when the vehicle is accelerating, the turbocharger needs to use the high-temperature and high-pressure exhaust gas from the engine to drive the turbocharger. Turbo, which in turn supercharges the engine. But this requires a process, for example: when the vehicle is accelerating rapidly, the exhaust energy of the engine in the initial stage of rapid acceleration is not enough in several working cycles, and it cannot effectively drive the turbocharger to reach the expected speed, resulting in acceleration hysteresis and affecting Acceleration performance. In addition, when the engine accele...

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Problems solved by technology

But this requires a process, for example: when the vehicle is accelerating rapidly, the exhaust energy of the engine in the initial stage of rapid acceleration is not enough in several working cycles, and it cannot effectively drive the turbocharger to reach the expected speed, resulting in acceleration hysteresis and affecting Acceleration performance. In addition, when the engine accelerates rapidly, the required boost pressure increases instantaneously. When only the turbocharger is used, the wastegate valve needs to be suffocated as much as possible, so that the boost pressure increases rapidly, which may easily cause the wastegate valve to suffocate. Dead, the exhaust back pressure of the engine increases rapidly, resulting in a rapid increase in fuel consumption, and due to the rapid increase in exhaust back pressure, the combustion in the current few cycles is unstable, and there is a risk of misfire, so there may be deterioration of emissions and blockage of the catalytic converter

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