A control method for a fuel cell hybrid vehicle

Abstract

The invention discloses a control method of a fuel cell hybrid vehicle. The control method includes mode setting and state setting of the fuel cell hybrid vehicle, specifically including acquiring a mode gear signal, acquiring a self-inspection status signal, judging a power battery capacity value, The step of judging the maximum allowable charging power of the power battery, etc., the control method also includes performing state setting according to the fault signal and obtaining the feedback target power of the motor. The present invention adjusts the energy supply source of the fuel cell hybrid vehicle according to the capacity of the power battery, thereby realizing a gentle transition when the fuel-electric system is turned on and off, and avoiding a rapid drop in the capacity value of the power battery while still having a large amount of remaining hydrogen in the fuel-electric system , or the continuous high capacity of the power battery leads to frequent start and stop of the fuel cell system, thereby prolonging the service life of the stack.

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 ...

Examples

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 Troubleshooting of the whole vehicle

[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 the motor temperature is too high, the power battery voltage is too high, etc. .), the whole vehicle must be powered off and the high-voltage connection disconnected. For fault level two, the entire vehicle will limit the maximum speed and reduce the system output power. For fault level one, the entire vehicle will only give an alarm prompt. The grade division of all faults in the fuel-fired power system is only fault grade 1 and fault grade 2 (the first-grade faults of the fuel-fired power system include the first-grade fault of excessive bottle mouth temperature, the first-grade fault of excessive hydrogen high pressure, and the first-grade fault of excessive hydrogen concent...

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-electric 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%≤SOCA4 =0.7; when 65%≤SOCA5 =4.9-6×SOC, name...

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 ...

Examples

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 Troubleshooting of the whole vehicle

[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 the motor temperature is too high, the power battery voltage is too high, etc. .), the whole vehicle must be powered off and the high-voltage connection disconnected. For fault level two, the entire vehicle will limit the maximum speed and reduce the system output power. For fault level one, the entire vehicle will only give an alarm prompt. The grade division of all faults in the fuel-fired power system is only fault grade 1 and fault grade 2 (the first-grade faults of the fuel-fired power system include the first-grade fault of excessive bottle mouth temperature, the first-grade fault of excessive hydrogen high pressure, and the first-grade fault of excessive hydrogen concent...

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-electric 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%≤SOCA4 =0.7; when 65%≤SOCA5 =4.9-6×SOC, name...

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