Hybrid vehicle series mode power distribution control system

Abstract

The utility model relates to the field of automobile manufacturing, concretely relates to a hybrid vehicle series connection mode power distribution control system. The system includes main control module, dynamic storage module, power coupling module and fly car protection module, the main control module integrated SOC grading processor and speed restraint calculator, the dynamic storage module stores SOC - power mapping three -dimensional table and speed limit three -dimensional table, the power coupling module contains charge -discharge power comparator and engine power corrector, the fly car protection module has double threshold speed difference detection circuit and oil breaker executor. The utility model realizes SOC level stable switching through hardware hysteresis comparator, and MOS tube circuit of power coupling module realizes real -time power restraint, and double threshold detection of fly car protection module improves response speed. Overall control system can reduce 35% SOC fluctuation amplitude, shorten fly car suppression time to 200ms and improve 28% driving smoothness score.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing, specifically to a series mode power distribution control system for hybrid vehicles. Background Technology

[0002] As national regulations on fuel consumption and emissions become increasingly stringent, most OEMs are focusing their research and development on new energy vehicles. Hybrid vehicles, as a type of new energy vehicle, are highly favored due to their low fuel consumption and long range. Hybrid vehicles are divided into several types, such as plug-in hybrids, strong hybrids, and range-extended electric vehicles. The architecture of most of these models dictates that series hybrid mode is a crucial drive mode, especially in urban driving conditions. In series hybrid mode, the engine does not directly drive the wheels. Instead, it works in conjunction with the P1 motor to generate electricity to power the P3 drive motor and charge the battery pack. Therefore, power distribution in series hybrid mode is particularly important, as it affects the vehicle's performance, fuel economy, drivability, and overall safety.

[0003] Existing patent CN116605204A describes a driving control method and device for hybrid vehicles in series mode. However, it suffers from the following structural defects in series mode: the control unit lacks an integrated SOC dynamic adjustment module, resulting in a lack of coordination between the battery management unit and the power distribution unit; the speed actuator lacks a speed-limiting constraint structure based on driving conditions; the power transmission path lacks a charging / discharging power coupling device; and the overspeed protection mechanism uses a single fuel cut-off actuator, lacking a dynamic torque compensation structure. Utility Model Content

[0004] To address the aforementioned problems, this invention introduces maximum and minimum engine speed limits based on vehicle drivability to ensure overall vehicle performance; it introduces State of Charge (SOC) levels to differentiate engine power output, maximizing battery pack electrical balance and keeping the vehicle within its optimal fuel efficiency range; it introduces battery pack charging and discharging power to ensure vehicle power and safety; and finally, it addresses engine runaway at its source, aiming to suppress it immediately and ensure the safety of the vehicle and driver. The specific technical solution is as follows: A series-mode power distribution control system for hybrid vehicles includes a main control module, a dynamic storage module, a power coupling module, and a runaway protection module. The main control module integrates a State of Charge (SOC) grading processor and a speed constraint calculator. The dynamic storage module stores a three-dimensional SOC-power mapping table and a three-dimensional speed limit table. The power coupling module includes a charge / discharge power comparator and an engine power corrector. The runaway protection module has a dual-threshold speed difference detection circuit and a fuel cut-off actuator. The main control module is connected to the battery management unit and the engine ECU via a CAN bus. The dynamic storage module communicates bidirectionally with the SOC grading processor via a data bus. The power coupling module's input is connected to a drive motor power sensor, and its output is connected to a P1 motor controller. The runaway protection module includes a speed signal acquisition line directly connected to a crankshaft position sensor.

[0005] Furthermore, the SOC grading processor includes a voltage comparison circuit connected to the battery sampling terminal, and a hysteresis comparator for SOC level switching anti-shake.

[0006] Furthermore, the speed constraint calculator incorporates a vehicle speed signal processing chip and a throttle opening AD conversion circuit. Furthermore, the charge / discharge power comparator uses a bidirectional power MOSFET to form a maximum / minimum value selection circuit.

[0007] This invention achieves stable SOC level switching through a hardware hysteresis comparator, implements real-time power constraint through the MOSFET circuit of the power coupling module, and improves response speed through dual-threshold detection in the overspeed protection module. The overall control system can reduce SOC fluctuation amplitude by 35%, shorten overspeed suppression time to 200ms, and improve driving smoothness score by 28%. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the utility model. Detailed Implementation

[0009] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0010] like Figure 1As shown, a series mode power distribution control system for hybrid vehicles includes a main control module, a dynamic storage module, a power coupling module, and a runaway protection module. The main control module integrates a State of Charge (SOC) grading processor and a speed constraint calculator. The dynamic storage module stores a three-dimensional table of SOC-power mapping and a three-dimensional table of speed limits. The power coupling module includes a charge / discharge power comparator and an engine power corrector. The runaway protection module has a dual-threshold speed difference detection circuit and a fuel cut-off actuator. The main control module is connected to the battery management unit and the engine ECU via a CAN bus. The dynamic storage module communicates bidirectionally with the SOC grading processor via a data bus. The power coupling module's input is connected to a drive motor power sensor, and its output is connected to a P1 motor controller. The runaway protection module includes a speed signal acquisition line directly connected to a crankshaft position sensor.

[0011] The SOC grading processor includes a voltage comparison circuit connected to the battery sampling terminal, and a hysteresis comparator for SOC level switching anti-jitter. The speed constraint calculator has a built-in vehicle speed signal processing chip and a throttle opening AD conversion circuit. The charge / discharge power comparator uses a bidirectional power MOSFET to form a maximum / minimum value selection circuit.

[0012] The preferred embodiments of this patent have been described in detail above. However, this patent is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this patent.

Claims

1. A series-mode power distribution control system for hybrid vehicles, characterized in that: The system includes a main control module, a dynamic storage module, a power coupling module, and a speed overrun protection module. The main control module integrates a SOC classification processor and a speed constraint calculator. The dynamic storage module stores a three-dimensional table of SOC-power mapping and a three-dimensional table of speed limits. The power coupling module includes a charge / discharge power comparator and an engine power corrector. The speed overrun protection module has a dual-threshold speed difference detection circuit and a fuel cut-off actuator. The main control module is connected to the battery management unit and the engine ECU via a CAN bus. The dynamic storage module communicates bidirectionally with the SOC classification processor via a data bus. The power coupling module's input is connected to the drive motor power sensor, and its output is connected to the P1 motor controller. The speed overrun protection module includes a speed signal acquisition line directly connected to the crankshaft position sensor.

2. The hybrid vehicle series mode power distribution control system according to claim 1, characterized in that: The SOC grading processor includes a voltage comparison circuit connected to the battery sampling terminal, and a hysteresis comparator for SOC level switching anti-shake.

3. The hybrid vehicle series mode power distribution control system according to claim 1, characterized in that: The speed constraint calculator has a built-in vehicle speed signal processing chip and an AD conversion circuit for throttle opening.

4. The series mode power distribution control system for hybrid vehicles according to claim 1, characterized in that: The charge / discharge power comparator uses a bidirectional power MOSFET to form a maximum / minimum value selection circuit.

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