50results about How to "Meet the dynamic requirements" patented technology

The invention discloses an idle oxygen supply control method and system for a fuel cell system. It is obtained after the vehicle is in an idling state and the electric energy of the second energy storage device reaches the set value, the air compressor of the oxygen supply subsystem in the fuel cell system is input through the fuel cell stack to work at the set power P0 ACS Oxygen is supplied to the fuel cell stack, and the excess electric energy generated by the fuel cell stack is consumed, so that the fuel cell stack's output of electric energy to the vehicle is zero. When the vehicle is idling, the fuel cell stack is used to supply power to the oxygen supply subsystem to consume the excess electric energy of the stack, so that the power output of the fuel cell stack to the whole vehicle is zero, which not only ensures that the stack maintains a low power working state, Shut down to ensure the power performance of the vehicle.

Disclosed is a structural dynamics design method of the rotor of an aerial engine. Based on the characteristics of the working status of a high propulsion ratio aerial engine, the structural dynamics design method of the rotor of the aerial engine presents the concept of thermal modal to adapt to structural dynamics design of the rotor of the aerial engine under variable working conditions. The structural dynamics design method of the rotor of the aerial engine is characterized by optimizing the parameters of the rotor and bearings, enabling the thermal modal of a rotor system to avoid the modal of the rotor under the absolute rigidity of the bearings, meanwhile, giving play to the effects of a damper and enabling the rotor system to meet the requirements of vibration standards in the thermal modal. The structural dynamics design method of the rotor of the aerial engine comprises taking the margin between the modal of the rotor with elastic bearings and the modal of the rotor under the absolute rigidity of the bearings as optimized parameters, meanwhile giving play to the damping effects of the damper to meet the dynamics requirements of the rotor system. The structural dynamics design method of the rotor of the aerial engine changes the traditional design concept of design first and checking calculation later and performs active design of the dynamics characteristics of the rotor to achieve circulating design, thereby improving the working efficiency and having significant engineering practical value.

A lane change planning method for an intelligent vehicle trajectory proposed by the present invention includes: obtaining road information, and fitting the current lane centerline equation according to the road information; judging the road shape according to the current lane centerline equation, and the road shape includes straight roads and curved roads Roads, curved roads include fixed curvature roads and variable curvature roads; determine the maximum lateral acceleration a during the lane change process according to the road shape, the running state of the own vehicle, and obstacle information max and lane change time t e ; Change lane time t e , Input the running status and obstacle information of the self-vehicle into the preset safety distance model to judge whether the lane-changing conditions are met; if yes, then according to the road shape and the lane-changing time t e Plan the lane change trajectory. The trajectory planning method proposed by the invention satisfies the vehicle dynamics requirements, can ensure the handling stability and driving safety of the lane changing process, is applicable to various road shapes, and has stronger applicability.

The invention discloses a vehicle power output control method and device, the method comprising: when the unit coordination controller receives the required power, acquires the ambient temperature of the environment where the vehicle is currently located, and determines the power mode corresponding to the ambient temperature , and send a power output instruction containing the required power and the power mode information to the motor controller; the motor controller determines the engine speed corresponding to the required power based on the power mode, and sends the engine controller to the engine controller speed, so that the engine controller uses the engine speed to control the engine to meet the power demand of the vehicle. The unit coordination controller selects a targeted power mode according to the ambient temperature of the vehicle, and sends different power output commands to the motor controller, so that the motor controller selects the engine speed in a targeted manner according to the required power to achieve the current ambient temperature The following dynamic requirements.

The invention provides an integrated optimization method for a dual-motor coupling drive system for an electric bus, wherein an upper layer and a lower layer algorithm are respectively constructed by using the particle swarm algorithm and the dynamic programming algorithm. Among them, the particle swarm algorithm uses the particle coordinates to represent the system parameters to be optimized, and uses the dynamic programming algorithm as the control strategy optimization algorithm under each particle to optimize the control strategy of the coupled drive system with the system power loss as the objective function. Each particle runs with the optimal control strategy, so that the minimum power loss that the obtained particle can achieve, and the weighted summation of the power loss and the power level is used as the objective function of the particle swarm optimization algorithm, and the particle swarm optimization algorithm seeks its objective function. The particle coordinate corresponding to the minimum value is the optimal system parameter.

The invention discloses a four-wheel drive chassis structure for a hybrid electric vehicle. The four-wheel drive chassis structure for the hybrid electric vehicle is characterized in that front wheels (14) are arranged at the left side and the right side of a front auxiliary frame (12) through a front suspension (13); an engine (1) and a front gearbox (15) are arranged inside the front auxiliary frame (12); the output end of the front gearbox (15) is connected with the front wheels (14) through a front half shaft; rear wheels (18) are mounted at the left side and the right side of a back auxiliary frame (16) through a back suspension (17); a driving motor (19) and a rear gearbox (20) are arranged inside a frame of the back auxiliary frame (16); a battery pack (21) and an oil tank (22) are arranged between the front auxiliary frame (12) and the back auxiliary frame (16). The four-wheel drive chassis structure for the hybrid electric vehicle has the advantages of reasonable layout, easiness of assembling, benefits in maintenance, small vibration and noise, low production cost and good riding comfort; meanwhile, the optimal driving manner in different working conditions can be realized; the requirements of dynamic properties can be met; the fuel economy can be effectively improved.

The invention discloses a hybrid power coupling mechanism. An output shaft of an engine (1) is fixedly sleeved with a first sun wheel (2), the first sun wheel (2) is meshed with a first outer ring (5) through first planet gears (3), all the first planet gears (3) are arranged on one end face of a planet carrier (4), second planet gears (7) are arranged on the other end face of the planet carrier (4), and all the second planet gears (7) are meshed with a second outer ring (6) and a second sun wheel (8); a big gear wheel (9) is coaxially fixed to the second sun wheel (8) and meshed with a pinion (11), and the pinion (11) is arranged on a main shaft of an ISG motor (10) in a sleeved mode. According to the hybrid power coupling mechanism, the optimum driving form under different working conditions can be achieved, power performance demands can be met, and fuel economy can be effectively improved; the hybrid power coupling mechanism has the advantages of being simple and compact in structure, small in size, easy to assemble, low in production cost, convenient to control, little in power loss, good in reliability, and the like.

The invention discloses a current / frequency conversion circuit linearity and symmetry digital compensation method. The current / frequency conversion circuit linearity and symmetry digital compensation method comprises the steps of measuring and recording D trigger output pulse number and subdivided pulse number when different current values are input into a current / frequency conversion circuit; confirming conversion circuit linearity compensation factors and performing compensation to a conversion circuit output in digital mode; measuring and obtaining symmetrical coefficient and zero coefficient of the current / frequency conversion circuit; and confirming symmetrical compensation coefficient of the conversion circuit and performing real-time compensation to the conversion circuit output in digital mode. By means of the current / frequency conversion circuit linearity and symmetry digital compensation method, the problems including complicated operation, effective accuracy, high demands on debugging persons and unsatisfied batch production demand in the current production debugging process is effectively solved.