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Control method of fuel cell hybrid vehicle

A control method and fuel cell technology, applied in the field of fuel cell hybrid vehicles, can solve the problems of frequent start and stop of fuel cell systems, attenuation of stack service life, and difference in braking experience of the whole vehicle, so as to avoid electric shock damage and prolong use. Longevity and the effect of improving operating efficiency

Inactive Publication Date: 2020-02-21
东风特汽(十堰)专用车有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In a high-power fuel-electric hybrid system, in order to ensure the output power of the fuel-electric system, the feedback of the motor will be prohibited, resulting in a significant difference in the braking experience of the vehicle when the fuel-electric system is turned on and off.
[0003] At the same time, when the output power of the gas-fired power system reaches more than 30kw, the power of the power battery will be reduced accordingly in terms of cost. At this time, the power of the gas-fired power system accounts for a relatively high proportion. It will cause the power battery capacity value SOC (State of charge, also known as the remaining power) to drop rapidly to the protection value while the remaining hydrogen in the fuel system is still large, or the SOC continues to be in a high state, causing the fuel cell system to frequently Start and stop, resulting in the rapid decay of the service life of the stack
[0004] In addition, when the whole vehicle fails, in order to ensure the high-voltage electrical safety of each module of the high-voltage system, each module must be shut down by the whole vehicle system. However, if a high-voltage module is suddenly shut down, it will cause electrical shock and damage other modules.

Method used

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  • Control method of fuel cell hybrid vehicle
  • Control method of fuel cell hybrid vehicle
  • Control method of fuel cell hybrid vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Embodiment 1 Vehicle Mode Management

[0057] Such as figure 1 As shown, after the vehicle completes the high-voltage action (that is, the main positive contactor and the main negative contactor of the power battery have been closed), the vehicle controller judges the gear of the vehicle mode switch. If the mode switch is in the pure electric mode gear, then The whole vehicle enters "pure electric mode", and the high voltage of the gas-electric system is not connected at this time; when the mode switch is in the gear of the gas-electric mode, the vehicle controller continues to judge whether the self-test status of the gas-electric system is passed, if the self-test status is not passed Then the whole vehicle is still in the "pure electric mode", and the high voltage of the gas-electric system is not connected; In this mode, if the SOC of the power battery is ≥ 90%, the start-up of the fuel-electric system of the whole vehicle is prohibited, and the whole vehicle is in...

Embodiment 2

[0058] Embodiment 2 Vehicle Troubleshooting

[0059] Each system module of the vehicle divides its own faults into three levels according to the severity of the impact of the fault state on the functional safety of the vehicle, and the third level of faults is the most serious fault (such as a motor temperature is too high a fault, a power battery voltage is too high a fault, etc. ), the whole vehicle must be powered off and the high-voltage connection disconnected, the whole vehicle of the failure level two is limited to the maximum speed and the system output power is reduced, and the whole vehicle of the failure level one is only given an alarm prompt. The classification of all faults in the fuel-fired power system is only fault-level one and fault-level two (the first-level faults of the fuel-fired power system include the first-level failure of the bottle mouth temperature is too high, the hydrogen high-pressure pressure is too high, the hydrogen concentration is too high,...

Embodiment 3

[0062] Embodiment 3 Calculation of the power of the fuel-fired power system:

[0063] According to the power battery SOC and the maximum allowable charging power of the battery, the vehicle can calculate the allowable fuel system output power P 1 and P 2 .

[0064] Such as image 3 As shown, after the vehicle enters the fuel-electric mode, when the SOC ≤ 60%, the vehicle is allowed to switch the fuel cell system from the off state to the on state, and the vehicle allows the fuel-electric system to output power coefficient η A0 Switch from 0 to 1. After the fuel-electric system is turned on, the whole vehicle restricts the power value of the fuel-electric system by stages according to the SOC value of the power battery. When SOC ≥ 90%, the allowable output power coefficient of the fuel system of the vehicle is η A1 =0; when 85%≤SOCA2 =0.5; when 80%≤SOCA3 =3.9-4×SOC, namely η Ax Linear smoothing from 0.5 to 0.7; when 70% ≤ SOC A4 =0.7; when 65%≤SOCA5 =4.9-6×SOC, namely η ...

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Abstract

The invention discloses a control method of a fuel cell hybrid vehicle. According to the control method, mode setting and state setting of the fuel cell hybrid vehicle are carried out, and the methodcomprises the specific steps of acquiring a mode gear signal, acquiring a self-checking state signal, judging the capacity value of a power cell, judging the maximum allowable charging power of the power cell and the like. The control method further comprises the steps of setting the state according to the fault signal and obtaining the feedback target power of a motor. According to the control method of the fuel cell hybrid vehicle, the energy supply source of the fuel cell hybrid vehicle is adjusted according to the capacity of the power cell, so that the smooth transition in the open and closed states of a fuel cell system is achieved, and the situation that the capacity value of the power cell drops rapidly, the residual hydrogen amount of the fuel cell system is still more, or the power cell capacity value is continuously in a higher state, so that the fuel cell system is frequently started and stopped is avoided, so that the service life of an electric pile is prolonged.

Description

technical field [0001] The invention belongs to the field of fuel cell hybrid vehicles, and more particularly relates to a control method for fuel cell hybrid vehicles. Background technique [0002] In the prior art, the fuel cell system of a fuel cell hybrid vehicle is mostly a 10kw power system, and is used as a range-extending device to provide a power source for the vehicle. When the fuel system is turned on, energy output is performed at a fixed power. If the state of the vehicle cannot meet the opening conditions of the fuel system or the fuel system itself fails to meet the operating conditions, the fuel system controls itself to prohibit starting or shut down immediately. In a high-power fuel-electric hybrid system, in order to ensure the output power of the fuel-electric system, the feedback of the motor will be prohibited, resulting in a significant difference in the braking experience of the vehicle when the fuel-electric system is turned on and off. [0003] At ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W30/19
CPCB60W30/19
Inventor 万骞李世斌马巍凌李开寒汪刚
Owner 东风特汽(十堰)专用车有限公司
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