CN112721650B - P-gear-free gear shifting control method of fuel cell hydrogen energy automobile - Google Patents

Abstract

The invention relates to the technical field of fuel cells, in particular to a control method for shifting gears of a fuel cell hydrogen energy automobile without a P gear, which mainly comprises the following steps: s1, a vehicle controller performs self-checking operation on a power-on running system of a whole vehicle; s2, the whole vehicle controller performs self-checking operation on the energy system; s3, the vehicle control unit performs self-checking operation on the high-voltage safety system; s4, the vehicle control unit acquires gear signal information, and if the gear signal is judged to be normal, the vehicle control unit correspondingly executes the operation of S5; if the gear signal is judged to be abnormal, the operation of S6 is correspondingly executed; s5, when the gear signal is judged to be normal, the vehicle controller controls the logic gear of the vehicle to switch N gear, R gear and D gear; and S6, when the gear signal is judged to be abnormal, the vehicle controller directly controls the logic gear of the whole vehicle to be switched to the N gear, or controls the logic gear of the whole vehicle to be kept as the gear before the fault of the whole vehicle. Compared with the traditional fuel vehicle, the control method of the invention has the advantages of more reasonable and reliable gear shifting strategy, more complete covered vehicle working conditions and capability of ensuring the reasonability of gear shifting to a great extent.

Description

P-gear-free gear shift control method of fuel cell hydrogen energy automobile

Technical Field

The invention relates to the technical field of fuel cells, in particular to a P-gear-free gear shift control method of a fuel cell hydrogen energy automobile.

Background

With the rapid development of hydrogen fuel cell vehicles, more and more hydrogen fuel cell vehicles are presented in front of people, and the control of gears becomes an important component of vehicle signal processing.

The reasonable gear control method can optimize the use mode of the automobile and can well ensure the safety of a driver and passengers under certain abnormal conditions, but the traditional fuel oil automobile has poor adaptability of the gear control method to the hydrogen energy automobile, and the safety performance of the hydrogen energy automobile in running can be influenced if the gear control method of the hydrogen energy automobile is not adjusted.

Disclosure of Invention

In view of the above, the present invention provides a method for controlling a shift of a fuel cell hydrogen-powered vehicle without a P-range.

The invention provides a method for controlling the gear shifting of a fuel cell hydrogen energy automobile without a P gear, which mainly comprises the following steps:

s1, starting a whole vehicle, wherein the whole vehicle controller carries out self-checking operation of a power-on running system of the whole vehicle, if the self-checking operation of the power-on running system is normal, the next step of operation is carried out, and if the self-checking operation is abnormal, the whole vehicle controller controls a logic gear of the whole vehicle to be kept at an N gear;

s2, after the self-checking of the power-on driving system is completed, the whole vehicle controller performs energy system self-checking operation, if the energy system self-checking is normal, the next operation is performed, and if the energy system self-checking is abnormal, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at the N gear;

s3, after the self-checking of the energy system is completed, the vehicle control unit performs the self-checking operation of the high-voltage safety system, if the self-checking operation of the high-voltage safety system is normal, the next operation is performed, and if the self-checking operation is abnormal, the vehicle control unit controls the logic gear of the vehicle to be kept in the N gear;

s4, after the self-checking of the high-voltage safety system is completed, the vehicle control unit acquires gear signal information, and if the gear signal is judged to be normal, the operation of S5 is correspondingly executed; if the gear signal is judged to be abnormal, the operation of S6 is correspondingly executed;

s5, when the gear signal is judged to be normal, the vehicle controller controls the logic gear of the vehicle to switch N gear, R gear and D gear by combining the gear shifting intention information of the driver, the absolute value information of the rotating speed of the motor and the brake depth information;

and S6, when the gear signal is judged to be abnormal, the vehicle control unit detects the motor rotating speed information of the whole vehicle, and the vehicle control unit directly controls the logic gear of the whole vehicle to be switched to the N gear, or controls the logic gear of the whole vehicle to be kept as the gear before the fault of the whole vehicle.

Further, the specific operation of S1 is:

s11, after the whole vehicle is started, the whole vehicle controller sequentially performs self-checking operation on a driving motor control system, a steering system and a braking system, if the driving motor control system, the steering system or the braking system cannot normally work is detected, the self-checking is abnormal, and at the moment, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at the N gear;

and S12, if the vehicle control unit detects that the driving motor control system, the steering system and the braking system can work normally, the self-checking of the electrified driving system is normal, and at the moment, the next operation is carried out.

Further, the specific operation of S2 is:

s21, after the self-inspection of the power-on running system is finished, the vehicle controller sequentially performs self-inspection operation on the hydrogen fuel cell system, the super capacitor system and the power battery system, if the hydrogen fuel cell system, the super capacitor system and the power battery system cannot work normally, the self-inspection is abnormal, and at the moment, the vehicle controller controls the logic gear of the vehicle to be kept at the N gear;

and S22, if the vehicle control unit detects that the hydrogen fuel cell system, the super capacitor system or the power battery system can work normally, the energy system is subjected to normal self-inspection, and at the moment, the next operation is carried out.

Further, the specific operation of S3 is:

s31, after the self-checking of the energy system is finished, if the vehicle controller detects that the high-voltage loop of the vehicle has electric leakage or short circuit, the vehicle controller controls the logic gear of the vehicle to be kept at N gear;

and S32, if the vehicle controller detects that no electric leakage or short circuit exists in a high-voltage loop of the vehicle, the high-voltage safety system is normally self-checked, and at the moment, the next operation is carried out.

Further, the specific operation of S5 is:

s51, when the gear signal is judged to be normal, if the intention of a driver is to switch from the N gear to the D gear or the R gear, the vehicle control unit detects the motor rotating speed information and the braking depth information of the whole vehicle, and if the absolute value of the motor rotating speed is less than or equal to S1 and the braking depth is more than 4%, the vehicle control unit controls the logic gear of the whole vehicle to be correspondingly switched from the N gear to the D gear or the R gear; if the vehicle control unit detects that the absolute value of the rotating speed of the motor is larger than S1, the vehicle control unit directly controls the logic gear of the vehicle to be switched from the N gear to the D gear or the R gear correspondingly;

s52, if the intention of a driver is to switch from the D gear or the R gear to the N gear, the vehicle controller directly controls the logic gear of the vehicle to switch from the D gear or the R gear to the N gear;

s53, if the intention of a driver is to switch from the D gear to the R gear or switch from the R gear to the D gear, detecting the motor rotating speed information of the whole vehicle by the whole vehicle controller, and if the absolute value of the motor rotating speed is less than or equal to S2, directly controlling the logic gear of the whole vehicle to switch from the D gear to the R gear or switch from the R gear to the D gear by the whole vehicle controller.

Further, S1=1400rpm.

Further, S2=50rpm.

The technical scheme provided by the invention has the beneficial effects that: the invention relates to a control method for a fuel cell hydrogen energy automobile without P gear shift, which has the following advantages:

(1) Compared with the traditional fuel vehicle, the method has the advantages that the gear shifting strategy is more reasonable and reliable, the covered whole vehicle working condition is more complete, and the rationality of gear shifting can be greatly ensured;

(2) The method ensures that the gear shifting signal is effective, also considers the driving state of the automobile, and correspondingly processes the gear shifting signal according to different driving states of the automobile, so that the situation is more diversified.

(3) The method processes more information, and the control scheme is more complicated than the traditional scheme, but the implementation cost is not increased.

Drawings

FIG. 1 is a block diagram of a fuel cell hydrogen vehicle without a P-range shift system according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, an embodiment of the present invention provides a system for shifting gears without P gear of a fuel cell hydrogen energy automobile, which includes a vehicle control unit VCU, a hydrogen fuel cell system FCU, a high voltage power distribution system PDU, a super capacitor system SCMS, a power battery system BMS, a driving motor control system, a steering system, and a braking system. The VCU is mainly used for collecting various information of the whole vehicle and collecting gear hard line signals, and judging whether to switch gears according to the state information of the whole vehicle and the gear hard line signals; the hydrogen fuel cell system FCU is a main energy source of the whole vehicle and sends key information of the hydrogen fuel cell system to the CAN communication bus; the power battery system BMS is an auxiliary energy source of the whole vehicle and sends key information of the power battery system to the CAN communication bus; the super capacitor system is an auxiliary energy source of the whole vehicle and sends key information of the super capacitor system to the CAN communication bus; the high-voltage distribution system is a high-voltage energy distribution system of the whole vehicle and sends key information of the high-voltage distribution system to the CAN communication bus; the driving motor control system is a source of driving power of the whole vehicle and sends key information of the driving motor control system to the CAN communication bus; the steering system controls the steering function of the whole vehicle and sends key information of the steering system to the CAN communication bus; the brake system of the automobile controls the brake function of the whole automobile and sends key information of the brake system to the CAN communication bus; the VCU acquires relevant states of all systems of the whole automobile on the bus, comprehensively judges whether gear switching is effective or not by reasonably judging the influence degree of all system states on the automobile, and determines the current gear state according to the state of the whole automobile when a gear signal fails. It should be noted that the specific structures of the vehicle control unit VCU, the hydrogen fuel cell system FCU, the high-voltage power distribution system PDU, the super capacitor system SCMS, the power battery system BMS, the driving motor control system, the steering system and the braking system are not improved, and the connection modes of the vehicle control unit VCU, the hydrogen fuel cell system FCU, the high-voltage power distribution system PDU, the super capacitor system SCMS, the power battery system BMS, the driving motor control system, the steering system, the braking system and the CAN bus are all applicable to the prior art.

A control method for a fuel cell hydrogen energy automobile without P gear shifting mainly comprises the following steps:

s1, starting a whole vehicle, wherein the whole vehicle controller carries out self-checking operation of a power-on running system of the whole vehicle, if the self-checking operation of the power-on running system is normal, the next step of operation is carried out, and if the self-checking operation is abnormal, the whole vehicle controller controls a logic gear of the whole vehicle to be kept at an N gear; the self-checking of the power-on running system comprises self-checking of a driving motor control system, a steering system and a braking system, and the specific operation of S1 is as follows:

s11, after the whole vehicle is started, the whole vehicle controller sequentially performs self-checking operation on a driving motor control system, a steering system and a braking system, if the driving motor control system, the steering system or the braking system cannot normally work is detected, the self-checking is abnormal, and at the moment, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at the N gear;

s12, if the vehicle control unit detects that the driving motor control system, the steering system and the braking system can work normally, self-checking is normal, and at the moment, the next step of operation is carried out;

after the whole vehicle is started, the whole vehicle is still in a static state, the whole vehicle controller starts to perform self-checking operation of a power-on running system, if the whole vehicle controller detects that a driving motor control system and a steering system or a braking system cannot work normally, the whole vehicle controller controls a logic gear of the whole vehicle to be kept in an N gear after detecting gear shifting operation intention information of a driver, and the driver is not allowed to perform corresponding physical gear switching, so that the purpose of limiting the running of the whole vehicle in time is achieved, and the safety of the driver and pedestrians is ensured;

s2, after the self-checking of the power-on driving system is completed, the whole vehicle controller performs energy system self-checking operation, if the energy system self-checking is normal, the next operation is performed, and if the energy system self-checking is abnormal, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at the N gear; wherein, energy system ' S self-checking includes hydrogen fuel cell system, super capacitor system and power battery system ' S self-checking, and S2 ' S specific operation does:

s21, after the whole vehicle is started, the whole vehicle controller sequentially performs self-checking operation on the hydrogen fuel cell system, the super capacitor system and the power battery system, if the hydrogen fuel cell system, the super capacitor system and the power battery system cannot work normally, the self-checking is abnormal, and at the moment, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at the N gear;

s22, if the vehicle control unit detects that the hydrogen fuel cell system, the super capacitor system or the power battery system can work normally, the energy system is subjected to normal self-inspection, and at the moment, the next operation is carried out;

when the vehicle control unit detects that the hydrogen fuel cell system, the super capacitor system and the power battery system cannot work normally, the vehicle control unit cannot obtain energy supply, controls the logic gear of the vehicle to be kept in the N gear after detecting the gear shifting operation intention information of a driver, and does not allow the driver to perform corresponding physical gear switching, so that the safety of the driver and pedestrians is ensured, and greater safety accidents caused by energy system faults are prevented;

s3, after the self-checking of the energy system is completed, the vehicle control unit performs the self-checking operation of the high-voltage safety system, if the self-checking operation of the high-voltage safety system is normal, the next operation is performed, and if the self-checking operation is abnormal, the vehicle control unit controls the logic gear of the vehicle to be kept in the N gear; the self-checking of the high-voltage safety system comprises the steps of detecting whether a high-voltage loop of the whole vehicle leaks electricity or is short-circuited, wherein the high-voltage loop specifically comprises a high-voltage loop between a hydrogen fuel cell system and a high-voltage power distribution system, a high-voltage loop between the high-voltage power distribution system and a power battery system, a super capacitor system and a driving motor controller, and a high-voltage loop between the driving motor controller and a driving motor, and the self-checking of the high-voltage safety system specifically comprises the following steps:

s31, after the self-checking of the energy system is finished, if the vehicle controller detects that electric leakage or short circuit exists in a high-voltage loop of the vehicle, the vehicle controller controls a logic gear of the vehicle to be kept at N gear;

s32, if the vehicle controller detects that no electric leakage or short circuit exists in a high-voltage loop of the vehicle, the high-voltage safety system is normally self-checked, and at the moment, the next operation is carried out;

if the vehicle controller detects that a high-voltage loop of the vehicle has a serious fault of electric leakage or short circuit, the vehicle controller controls the logic gear of the vehicle to be kept in the N gear after detecting the gear shifting operation intention information of a driver, and the driver is not allowed to perform corresponding physical gear switching, so that the safety of the driver and pedestrians is ensured, and a larger safety accident caused by a power distribution system fault is prevented;

s4, after the self-checking of the high-voltage safety system is completed, the vehicle control unit acquires gear signal information, and if the gear signal is judged to be normal, the operation of S5 is correspondingly executed by combining with the gear shifting intention information of a driver; if the gear signal is judged to be abnormal, the operation of S6 is correspondingly executed;

it should be noted that, during the S1-S4 operation, the entire vehicle is in a stationary state all the time, and does not have a driving function, and at this time, no matter what the driver intends to switch the physical gear to any gear of R, N, and D, the entire vehicle controller controls the logical gear of the entire vehicle to be maintained in the N gear, and does not allow the driver to perform corresponding physical gear switching. The neutral gear state is kept more reasonably when the whole vehicle does not have a running function, and a driver is reminded that the whole vehicle has a fault and needs to be maintained in time.

In addition, when the whole vehicle is in a static state, after the self-checking of the power-on running system, the self-checking of the energy system and the self-checking of the high-voltage safety system are all normal, the next operation is carried out, so that the switching of the logic gear can be allowed under the condition that the braking function and the steering function of the whole vehicle are all normal, and the whole vehicle is ensured to have a good braking function and a good steering function before running.

S51, when the gear signal is judged to be normal, if the intention of a driver is to switch the physical gear from the N gear to the D gear or the R gear, the vehicle control unit detects the motor rotating speed information and the brake depth information of the whole vehicle, and if the absolute value of the motor rotating speed is less than or equal to S1 and the brake depth is more than 4%, the vehicle control unit controls the logic gear of the whole vehicle to be switched from the N gear to the D gear or the R gear; if the vehicle control unit detects that the absolute value of the motor rotating speed is greater than S1, the vehicle control unit directly controls the logic gear of the vehicle to be switched from the N gear to the D gear or the R gear correspondingly, and after the logic gear is switched from the N gear to the D gear or the R gear correspondingly, a driver can complete the physical gear switching operation from the N gear to the D gear or the R gear;

s52, if the intention of a driver is to switch the physical gear from the D gear or the R gear to the N gear, the vehicle controller directly controls the logical gear of the vehicle to be switched from the D gear or the R gear to the N gear, and after the logical gear is switched from the D gear or the R gear to the N gear, the driver can complete the physical gear switching operation from the D gear or the R gear to the N gear;

s53, if the intention of a driver is to switch the physical gear from the D gear to the R gear or the R gear to the D gear, detecting the motor rotating speed information of the whole vehicle by the vehicle controller, if the absolute value of the motor rotating speed is less than or equal to S2, directly controlling the logic gear of the whole vehicle to be switched from the D gear to the R gear or the R gear to the D gear by the vehicle controller, and after the logic gear is switched from the D gear to the R gear or the R gear to the D gear, completing the physical gear switching operation from the D gear to the R gear or from the R gear to the D gear by the driver;

where S1=1400rpm and S2=50rpm. During the driving process of the whole vehicle, according to the gear shifting intention information of a driver, different motor rotating speed information and brake depth information are combined, and the gear switching operation of the logical gears is controlled correspondingly by the whole vehicle controller, so that the normal switching of the physical gears is ensured. When the whole vehicle is in a low vehicle speed state (namely the absolute value of the rotating speed of the motor is less than or equal to 50 rpm), the R gear and the N gear can be freely switched without judging whether a braking signal and a steering signal of the whole vehicle are effective or not; if the absolute value of the rotating speed of the motor is larger than 50rpm, gear switching between the R gear and the D gear is forbidden, so that a driver can be prevented from performing wrong gear switching operation, and a driving system is protected; when the whole vehicle is in a low-speed state (namely the absolute value of the rotating speed of the motor is less than or equal to 1400 rpm), whether a braking signal and a steering signal are effective or not is not required to be judged, and the R gear and the N gear or the D gear and the N gear are allowed to be freely switched, so that a driver can well control the state of the whole vehicle; when the whole vehicle is in a state of higher motor speed (namely the absolute value of the motor speed is more than 1400 rpm), the whole vehicle prohibits gear switching among R, N, D, N and D and N gears, so that the accident caused by rear-end collision of the rear vehicle due to sudden power loss when the whole vehicle is in a high-speed state can be prevented, and the driver is prevented from carrying out wrong gear switching operation and protecting a driving system;

here, it should be noted that, in the present invention, the absolute value of the rotation speed of the motor and the braking depth information are both obtained in the prior art.

S6, when the gear signal is judged to be abnormal, the vehicle controller detects motor rotating speed information of the vehicle; if the absolute value of the motor rotating speed is less than or equal to S1, the whole vehicle controller directly controls the logic gear of the whole vehicle to be switched to N gear, and if the absolute value of the motor rotating speed is greater than S1, the whole vehicle controller controls the logic gear of the whole vehicle to be kept as the gear before the fault of the whole vehicle.

The method comprises the following steps that S1=1400rpm, when gear signals are abnormal, corresponding gear switching needs to be reasonably controlled according to the running state of the whole vehicle, if the rotating speed of a motor of the whole vehicle is low (the absolute value of the rotating speed of the motor is less than or equal to 1400), corresponding physical gear switching is not allowed, and the logical gear of the whole vehicle is kept to be N gear all the time. The whole vehicle is easily controlled by a driver when the rotating speed of a motor of the whole vehicle is low, so that the logic gear is actively limited to the N gear, the driver can conveniently stop the whole vehicle in time, and the driver is prevented from actively driving the whole vehicle when the gear fault is not clear, and the larger damage is caused.

And if the motor rotating speed of the whole vehicle is higher (the absolute value of the motor rotating speed is more than 1400), the driver is not allowed to carry out corresponding physical gear switching at the moment, and the whole vehicle controller controls the logical gear of the whole vehicle to be kept at the gear before the fault of the whole vehicle so as to keep the gear state of the whole vehicle to be always the gear before the fault. The gear is actively limited to the gear before the fault due to the fact that the whole vehicle is difficult to be controlled by a driver in time when the rotating speed of the motor of the whole vehicle is high, corresponding driving operation of the driver according to the current running state of the whole vehicle is facilitated, and the situation that the driver loses power suddenly when the gear has the fault under the condition that the rotating speed of the motor is high and larger damage is caused is avoided.

In this document, the terms front, back, upper, lower and the like in the drawings are used for the sake of clarity and convenience only for the components are located in the drawings and the positions of the components relative to each other. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.

The features of the embodiments and embodiments described herein above may be combined with each other without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A fuel cell hydrogen energy automobile gear shifting control method without a P gear is characterized by mainly comprising the following steps:

s1, starting a whole vehicle, wherein the whole vehicle controller carries out self-checking operation of a power-on running system of the whole vehicle, if the self-checking operation of the power-on running system is normal, the next step of operation is carried out, and if the self-checking operation is abnormal, the whole vehicle controller controls a logic gear of the whole vehicle to be kept at an N gear;

s2, after the self-checking of the power-on driving system is completed, the vehicle control unit performs energy system self-checking operation, if the energy system self-checking is normal, the next step of operation is performed, and if the energy system self-checking is abnormal, the vehicle control unit controls the logic gear of the vehicle to be kept in the N gear;

s3, after the self-checking of the energy system is completed, the vehicle control unit performs self-checking operation on the high-voltage safety system, if the self-checking of the high-voltage safety system is normal, the next operation is performed, and if the self-checking of the high-voltage safety system is abnormal, the vehicle control unit controls the logic gear of the vehicle to be kept at N gear;

s4, after the self-checking of the high-voltage safety system is completed, the vehicle control unit acquires gear signal information, and if the gear signal is judged to be normal, the operation of S5 is correspondingly executed; if the gear signal is judged to be abnormal, the operation of S6 is correspondingly executed;

s5, when the gear signal is judged to be normal, the vehicle controller controls the logic gear of the vehicle to switch N gear, R gear and D gear by combining the gear shifting intention information of the driver, the absolute value information of the rotating speed of the motor and the brake depth information;

specifically, S51, when the gear signal is judged to be normal, if the intention of a driver is to switch from the N gear to the D gear or the R gear, the vehicle control unit detects the motor rotating speed information and the brake depth information of the whole vehicle, and if the absolute value of the motor rotating speed is less than or equal to 1400rpm and the brake depth is greater than 4%, the vehicle control unit controls the logic gear of the whole vehicle to be correspondingly switched from the N gear to the D gear or the R gear; if the vehicle control unit detects that the absolute value of the rotating speed of the motor is larger than 1400rpm, the vehicle control unit directly controls the logic gear of the vehicle to be switched from the N gear to the D gear or the R gear correspondingly;

s52, if the intention of the driver is to switch the D gear or the R gear to the N gear, the vehicle controller directly controls the logic gear of the vehicle to switch the D gear or the R gear to the N gear;

s53, if the intention of a driver is to switch from the D gear to the R gear or to switch from the R gear to the D gear, detecting the motor rotating speed information of the whole vehicle by the whole vehicle controller, and if the absolute value of the motor rotating speed is less than or equal to 50rpm, directly controlling the logic gear of the whole vehicle by the whole vehicle controller to switch from the D gear to the R gear or switch from the R gear to the D gear;

and S6, when the gear signal is judged to be abnormal, the vehicle controller detects the motor rotating speed information of the whole vehicle, and the vehicle controller directly controls the logic gear of the whole vehicle to be switched to the N gear or controls the logic gear of the whole vehicle to be kept as the gear before the fault of the whole vehicle.

2. The method for controlling the shifting of the fuel cell hydrogen energy automobile without the P gear is characterized in that the specific operation of S1 is as follows:

s11, after the whole vehicle is started, the whole vehicle controller sequentially carries out self-checking operation on a driving motor control system, a steering system and a braking system, if the driving motor control system, the steering system or the braking system cannot work normally, the self-checking is abnormal, and at the moment, the whole vehicle controller controls the logic gear of the whole vehicle to be kept at N gear;

and S12, if the vehicle control unit detects that the driving motor control system, the steering system and the braking system can work normally, the self-checking of the electrified driving system is normal, and at the moment, the next operation is carried out.

3. The method for controlling the shifting of the fuel cell hydrogen energy automobile without the P gear is characterized in that the specific operation of S2 is as follows:

s21, after the self-inspection of the power-on running system is finished, the vehicle controller sequentially performs self-inspection operation on the hydrogen fuel cell system, the super capacitor system and the power battery system, if the hydrogen fuel cell system, the super capacitor system and the power battery system cannot work normally, the self-inspection is abnormal, and at the moment, the vehicle controller controls the logic gear of the vehicle to be kept at the N gear;

and S22, if the vehicle control unit detects that the hydrogen fuel cell system, the super capacitor system or the power battery system can work normally, the energy system is subjected to normal self-inspection, and at the moment, the next operation is carried out.

4. The method for controlling shifting without P gear of a fuel cell hydrogen vehicle according to claim 1, wherein the specific operations of S3 are:

s31, after the self-checking of the energy system is completed, if the vehicle controller detects that the high-voltage loop of the vehicle has electric leakage or short circuit, the vehicle controller controls the logic gear of the vehicle to be kept at the N gear;

and S32, if the vehicle controller detects that no electric leakage or short circuit exists in a high-voltage loop of the vehicle, the high-voltage safety system is normally self-checked, and at the moment, the next operation is carried out.

Images