Shift method and shift system of hybrid electric vehicle

A technology for hybrid electric vehicles and shifting methods, which is applied in the direction of hybrid electric vehicles, motor vehicles, power plants, etc., can solve the problems of poor energy saving and difficult control, and achieve the effect of avoiding difficult control and simple control

Active Publication Date: 2015-08-19
BEIJING BORGWARD AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention lies in the problems that the automobile gear shifting method in the prior art is difficu

Method used

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  • Shift method and shift system of hybrid electric vehicle
  • Shift method and shift system of hybrid electric vehicle
  • Shift method and shift system of hybrid electric vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] A kind of shifting method of hybrid electric vehicle is provided in the present embodiment, comprises the steps:

[0078] First, judge whether the battery is in a dischargeable state or needs to be charged according to the battery usage status, the driver's power demand torque and the vehicle state. Since a hybrid vehicle has both a fuel-powered system and a battery-powered system, the fuel-powered system can also charge the battery. Therefore, it is necessary to judge whether the battery is in a discharging state or a charging state, and the output of the power system of the vehicle is different in these two states. Judging whether the battery is in a discharge state or a charge state can be judged in combination with the remaining power of the battery, the driver's demand for power, and the current status of the vehicle. The battery SOC (State of charge) is directly proportional to the remaining power of the battery, so the remaining power of the battery can be judge...

Embodiment 2

[0086] A kind of shifting method of hybrid electric vehicle is provided in the present embodiment, comprises the steps:

[0087] (1) Determine whether the battery is in a dischargeable state or needs to be charged according to the battery usage status, the driver's power demand torque, and the vehicle state. Specifically include:

[0088] When the remaining power of the battery is greater than the upper threshold, the battery is in a dischargeable state. The battery SOC is used to reflect the remaining power of the battery, that is, when the battery SOC value is greater than the upper limit threshold, the battery is in a dischargeable state.

[0089] When the remaining power of the battery is lower than the lower threshold, the battery needs to be charged. That is, when the battery SOC value is less than the lower limit threshold, the battery is in a charging state.

[0090]When the remaining power of the battery is between the upper threshold and the lower threshold, if th...

Embodiment 3

[0113] Figure 5 It is a schematic diagram of the BSG (Belt starter generator) hybrid structure. The BSG is connected to the engine crankshaft through a transmission belt, and the engine power is transmitted to the wheels through a 6-speed AT (Automatic transmission). The maximum output power of the BSG is 15kW, and the battery voltage and capacity are 48 Volts and 20Ah, the battery output power is 15kW for 10 seconds.

[0114] From the above structures and parameters, it can be seen that limited by the battery and motor parameters, the power assist and power generation torque of BSG are relatively small. According to the characteristics of this type of mild hybrid electric vehicle, a three-step method for specifying the shift schedule is proposed, such as figure 2 , 3 and 4, the specific control algorithm is as follows:

[0115] 1) The real-time input parameters are battery SOC, vehicle speed, current gear and vehicle demand torque (at the wheel).

[0116] 2) Step 1, dete...

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Abstract

The invention provides a shift method of a hybrid electric vehicle. The method comprises the steps of firstly, determining that a battery is in a dischargeable state or a rechargeable state according to SOC (state of charge) of the battery, torque required by a driver and the state of the vehicle; secondly, determining a possible gear at a certain speed under the two conditions and the torque and rotational speed of an engine corresponding to each gear; and finally, determining a target gear under the condition of a minimum fuel consumption rate of the engine and determining whether to perform shift operation according to the time interval between two times of shift. The method has the advantages that in determining the state of the battery, the problem that the state of the battery is repetitively changed due to jump of the SOC is avoided by adopting the comprehensive judgment of values of the SOC (state of charge) of the battery, the torque required by the driver and the state of the vehicle; in determining the target gear, the target gear is determined from all possible gears under the condition of the minimum fuel consumption rate of the engine, and the fuel consumption at the target gear is guaranteed to be minimum; and whether to perform shift operation is determined according to the time interval between two times of shift, and thus frequent shift is avoided.

Description

technical field [0001] The invention relates to a control method for a hybrid electric vehicle, in particular to a gear shifting method and system for a hybrid electric vehicle. Background technique [0002] Hybrid Electric Vehicle (HEV) refers to a vehicle whose drive system is composed of two or more single drive systems that can operate simultaneously. supply. Due to the different components, layout methods and control strategies, a variety of classification forms have been formed. The energy-saving and low-emission features of hybrid vehicles have aroused great concern in the automotive industry and become a focus of automotive research and development. [0003] In order to keep the vehicle in good condition during driving, it is necessary to change gears according to different situations. At present, the shift schedules with two parameters (throttle and vehicle speed) and three parameters (throttle, vehicle speed and acceleration) are the most widely used. However, ...

Claims

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Application Information

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IPC IPC(8): B60W20/00B60W10/10
CPCB60W10/10B60W20/00B60W40/105B60W2510/244B60W2520/10B60W2710/1005F16H61/0213B60K6/485B60W10/06B60W10/11B60W30/1882B60W2710/0644B60W2710/0666B60W2710/083B60W20/13B60W20/30F16H59/70F16H59/44B60W10/08F16H2059/366F16H2059/148F16H2059/6815F16H2061/0015Y10S903/945Y10S903/93Y02T10/84Y02T10/40Y02T10/62B60W20/40B60W2510/1005B60W2510/0638B60W2510/0657B60W2510/083Y02T10/60
Inventor 杨伟斌
Owner BEIJING BORGWARD AUTOMOBILE CO LTD
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