Small-sized pure electric automobile power assembly control system

Abstract

The invention relates to a power assembly manipulation system for a miniature pure electric vehicle; wherein, a brake switch is connected with an input end of brake signals of an ECU controller; a start switch is connected with an input end of start signals of the ECU controller; an output end of a vehicle speed sensor is connected with an input end of vehicle speed signals of the ECU controller; an output end of a rotating speed sensor is connected with an input end of rotating speed signals of the ECU controller; an output end of a gear change control unit is connected with an input end of gear change signals of the ECU controller; a first output end of the ECU controller is connected with a clutch motor; a second output end of the ECU controller is connected with a motor. The system adopts self-adaptive control of the motor, an automatic clutch and a speed change mechanism; the whole power assembly is simple and compact in structure, easy in assembly, light in weight and low in cost, not only improves the power performance of the whole vehicle but also realizes automatic switch of the gear, improves driving comfort and meets the relative requirements of the miniature pure electric vehicle, such as power performance, economy, whole vehicle cost, etc.

Description

Technical field [0001] The invention belongs to the field of automobile technology, and in particular relates to a small pure electric automobile powertrain control system. Background technique [0002] At present, due to the environmental pollution caused by fuel vehicles and the rising international oil prices, various automobile manufacturers have stepped up their research on electric vehicles, especially small pure electric vehicles, which have become the research direction of domestic and foreign auto companies. [0003] A small pure electric vehicle refers to a new type of vehicle whose mass is less than 900kg and uses electricity as its power source. The power performance indicators of small pure electric vehicles refer to the test standards of GB 18385-2001: maximum speed ≥100km / h; acceleration time ≤6s when 0-50km / h, ≤8s when 50-80km / h; maximum climbing degree is 20%. The economic indicators of small pure electric vehicles refer to the test standards of GB 18386-2001: en...

AI Technical Summary

Problems solved by technology

[0005] 1. Replace the internal combustion engine drive system with a motor drive system. The transmission components such as the gearbox, drive shaft, rear axle and half shaft of the internal combustion engine vehicle are retained in the traditional system, but the structure is complicated, the assembly is difficult, the weight is heavy, and the manufacturing cost is high. It is not an application and direction of development

[0006] 2. Driven by hub motors, the motors are installed in the hubs of the wheels to directly drive the wheels, improving transmission efficiency, saving space, and reducing suspension quality, but there are many disadvantages, such as the integration of the motor and the wheels resulting in a large unsprung mass, which deteriorates the suspension Vibration isolation performance affects the handling and safety of the vehicle on uneven road conditions. Under the condition of heavy load and low speed climbing, the wheel hub motor is prone to overheating and burning due to insufficient cooling. The currently applied technology is not yet mature.

[0007] 3. The electromechanical integrated drive system cancels the gear box, and only uses a part of mechanical transmission gears, differentials, half shafts and other components to transmit power, which saves space and facilitates design and integration. It is the current application and development direction , but the power performance in the prior art is not good, the driver's shifting intensity is large, the shifting time is long, and the driving comfort is poor

[0008] To sum up, the existing electric vehicles either have complex structure of the powertrain, difficult assembly, heavy weight, and high cost, making it difficult to meet the economic and vehicle cost requirements of small pure electric vehicles; or the acceleration and climbing capabilities are not strong , the shifting operation is complicated, the driving comfort is poor, and it is difficult to meet the power requirements of small pure electric vehicles; at the same time, the fuel cells used in electric vehicles are very expensive and basically rely on imports, which have become restrictions on the application and development of small pure electric vehicles How to design a brand-new powertrain control system so that small pure electric vehicles can meet the relevant requirements of power performance, economy and vehicle cost is a problem to be solved by automobile manufacturers

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