The invention discloses a urea SCR ammonia coverage rate feedback tracking control method, and belongs to the technical field of automobiles. The urea SCR ammonia coverage rate feedback tracking control method is put forward according to a mononuclear urea SCR system and is simple and easy to implement. The method includes the steps that a system model needed by the ammonia coverage rate feedback tracking control method is established, the target of the ammonia coverage rate feedback tracking control method is to track the ammonia coverage rate, and the two state variables of the ammonia coverage rate QNH3 and ammonia concentration CNH3 are taken into account. A controller designed based on a linear auto-disturbance-rejection thought is adopted in the design. The method has the quintessence of auto-disturbance-rejection control, various external disturbances and internal disturbances borne by the system in the operating process are estimated and compensated in real time, the overshoot is small, the response speed is high, precision is high, and antijamming capability is high. Moreover, the problem that the number of the parameters of an original auto-disturbance-rejection controller is multiple is solved, the number of the control parameters is decreased to be three, it is of specific physical significance, engineering application is facilitated, and a good practical control effect is achieved.

Urea SCR ammonia coverage rate feedback tracking control method

The invention relates to an automobile hydrogen cell temperature control system and a control method thereof. The temperature control system comprises a thermostat, an electronic water pump, a three-way valve, a radiator and a fuel gas heater, an interface 2 of the thermostat is connected with a cooling liquid outlet of a cell electric pile, an interface 1 of the thermostat is connected with a liquid inlet of the electronic water pump, a liquid outlet of the electronic water pump is connected with an interface 1 of the three-way valve, and an interface 2 of the three-way valve is connected with a cooling liquid inlet of the cell electric pile; an interface 3 of the thermostat is connected with one end of the radiator, and the other end of the radiator is connected with the liquid inlet ofthe electronic water pump; an interface 3 of the three-way valve is connected with a liquid inlet of the fuel gas heater, and a gas outlet of the fuel gas heater is connected with a cooling liquid inlet of the cell electric pipe; and the fuel gas heater is connected with an air pipeline and a hydrogen pipeline, and the hydrogen pipeline is connected with a hydrogen storage cylinder. The control system has the advantages of simple structure, flexible control and high adaptability, and the control method has the advantages of simple procedures, high execution efficiency and safe and reliable use.

Automobile hydrogen cell temperature control system and control method thereof

In nonlinear Model Predictive Control (MPC) algorithms, the number of cost-function evaluations and the resulting calculation time depend on the initial solution to the nonlinear optimisation task. Since calculations must be performed fast on-line, the objective is to minimise these indicators. This work discusses twelve initialisation strategies for nonlinear MPC. In general, three categories of strategies are discussed: (a) five simple strategies, including constant and random guesses as well as the one based on the previous optimal solution, (b) three strategies that utilise a neural approximator and an inverse nonlinear static model of the process and (c) four hybrid original methods developed by the authors in which an auxiliary quadratic optimisation task is solved or an explicit MPC controller is used; in both approaches, linear or successively linearised on-line models can be used. Efficiency of all methods is thoroughly discussed for a neutralisation reactor benchmark process and some of them are evaluated for a robot manipulator, which is a multivariable process. Two strategies are found to be the fastest and most robust to model imperfections and disturbances acting on the process: the hybrid strategy with an auxiliary explicit MPC controller based on a successively linearised model and the method which uses the optimal solution obtained at the previous sampling instant. Concerning the hybrid strategies, since a simplified model is used in the auxiliary controller, they perform much better than the approximation-based ones with complex neural networks. It is because the auxiliary controller has a negative feedback mechanism that allows it to compensate model errors and disturbances efficiently. Thus, when the auxiliary MPC controller based on a successively linearised model is available, it may be successfully and efficiently used for the initialisation of nonlinear MPC, whereas quite sophisticated methods based on a neural approximator are very disappointing.

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Initialisation of Optimisation Solvers for Nonlinear Model Predictive Control: Classical vs. Hybrid Methods

A new procedure, based on measurement of intake CO2 concentration and ambient humidity was developed and assessed in this study for different diesel engines in order to evaluate the oxygen concentration in the intake manifold. Steady-state and transient datasets were used for this purpose. The method is very fast to implement since it does not require any tuning procedure and it involves just one engine-related input quantity. Moreover, its accuracy is very high since it was found that the absolute error between the measured and predicted intake O2 levels is in the ±0.15% range. The method was applied to verify the performance of a previously developed NOx model under transient operating conditions. This model had previously been adopted by the authors during the IMPERIUM H2020 EU project to set up a model-based controller for a heavy-duty diesel engine. The performance of the NOx model was evaluated considering two cases in which the intake O2 concentration is either derived from engine-control unit sub-models or from the newly developed method. It was found that a significant improvement in NOx model accuracy is obtained in the latter case, and this allowed the previously developed NOx model to be further validated under transient operating conditions.

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Calculation of Intake Oxygen Concentration through Intake CO2 Measurement and Evaluation of Its Effect on Nitrogen Oxide Prediction Accuracy in a Heavy-Duty Diesel Engine

The invention discloses a fuel cell cold start device and a control method, and belongs to the technical field of automobiles. The device comprises a first circulating pump, a first heat exchanger anda first electric heating mechanism which are sequentially connected through pipelines to form a first circulating loop, and a second circulating pump, a second heat exchanger and a second electric heating mechanism which are sequentially connected through pipelines to form a second circulating loop. The first heat exchanger can heat a power cell, and the second heat exchanger can heat a fuel cell. The device also comprises a system controller and a power motor. The system controller is electrically connected with the fuel cell, the power cell, the first circulating pump, the first electric heating mechanism, the second circulating pump, the second electric heating mechanism and the power motor. Compared with the prior art, under the condition that the temperature of the fuel cell is lowerthan zero DEG C, the fuel cell can work with high output power, the fuel cell is heated, freezing of water generated in the fuel cell is avoided, rapid cold start is achieved, and the performance ofthe whole vehicle is improved.

Fuel cell cold start device and control method

The invention belongs to the technical field of fuel cell starting devices, relates to a combined low-temperature cold starting device for a fuel cell power system and a control method, and solves a problem that the fuel cell deals with difficult startup by adopting different heating modes under a low-temperature state so as to ensure the stable operation of the fuel cell. The combined low-temperature cold starting device is provided with a temperature sensor a, an electric heater, a liquid coolant circulating pump a, a power battery and an electric heater which are used for an electric heaterheating start mode, a temperature sensor b, a liquid coolant circulating pump b, a combustion gas heater and a fuel cell stack which are used for a high-temperature gas heating start mode, a temperature sensor c, a mixed gas heater and a fuel cell stack which are used for a fuel cell stack electrode catalytic heating start mode. The invention further provides a control method of the combined low-temperature cold starting device for the fuel cell power system, which selects different start modes through detecting the temperature.

Combined low-temperature cold starting device for fuel cell power system and control method

To simultaneously achieve high fuel efficiency and low emissions in a diesel hybrid electric vehicle (DHEV), it is necessary to optimize not only power split but also exhaust thermal management for emission aftertreatment systems. However, how to coordinate the power split and the exhaust thermal management to balance fuel economy improvement and emissions reduction remains a formidable challenge. In this paper, a hierarchical model predictive control (MPC) framework is proposed to coordinate the power split and the exhaust thermal management. The method consists of two parts: a fuel and thermal optimized controller (FTOC) combining the rule-based and the optimization-based methods for power split simultaneously considering fuel consumption and exhaust temperature, and a fuel post-injection thermal controller (FPTC) for exhaust thermal management with a separate fuel injection system added to the exhaust pipe. Additionally, preview information about the road grade is introduced to improve the power split by a fuel and thermal on slope forecast optimized controller (FTSFOC). Simulation results show that the hierarchical method (FTOC + FPTC) can reach the optimal exhaust temperature nearly 40 s earlier, and its total fuel consumption is also reduced by 8.9%, as compared to the sequential method under a world light test cycle (WLTC) driving cycle. Moreover, the total fuel consumption of the FTSFOC is reduced by 5.2%, as compared to the fuel and thermal on sensor-information optimized controller (FTSOC) working with real-time road grade information.

Modeling and Integrated Optimization of Power Split and Exhaust Thermal Management on Diesel Hybrid Electric Vehicles

The utility model belongs to the technical field of fuel cell starting devices, relates to a combined low-temperature cold starting device of a fuel cell power system and a control method, and solvesthe problem that a fuel cell is difficult to start by adopting different heating modes in a low-temperature state, so that the fuel cell stably operates. The combined low-temperature cold starting device comprises a temperature sensor a, an electric heater, a cooling liquid circulating pump a, a power battery and an electric heater, wherein the electric heater is used for an electric heater heating starting mode; the temperature sensor b, the cooling liquid circulating pump b, the combustion gas heater and the fuel cell stack are used for a high-temperature fuel gas heating starting mode; thetemperature sensor c, the mixed gas heater and the fuel cell stack are used for a fuel cell stack electrode catalytic heating starting mode; the utility model further provides a control method of thecombined low-temperature cold starting device of the fuel cell power system, and different starting modes are selected by detecting the temperature.

Fuel cell power system combined low-temperature cold starting device

The invention discloses an SCR (selective catalytic reduction) system transient NH3 leakage control system for a supercharged diesel engine. The system comprises a transient acceleration working condition urea spraying correction module, master and slave SCR conversion units and a NOx sensor arranged between the master and slave SCR conversion units. According to a method, the amount of urea sprayed under a transient acceleration working condition is regulated in advance based on a transient degree judged according to an accelerator pedal signal, so that the influence of transient control response hysteresis caused by SCR system NH3 storage time lag, sensor measurement delay and the like can be reduced to a certain extent, and the problem of NH3 leakage under the transient acceleration working condition of the supercharged diesel engine can be effectively solved; meanwhile, due to the arrangement of the master and slave SCR conversion units, on the premise of finishing basic closed-loop control over urea spraying based on the NOx sensor, excessive NH3 can be stored, and residual NOx in a conversion process of the master SCR conversion unit can also be secondarily converted; the NOx conversion efficiency is maximally improved, the escape of NH3 is maximally reduced, the cost is also controlled as much as possible, and the system and the method are easy to industrially popularize.

SCR (selective catalytic reduction) system transient NH3 leakage control system and method for supercharged diesel engine

The invention discloses a two-channel EGR regulating device and a control method thereof. The two-channel EGR regulating device is used for meeting demand of an engine on an EGR temperature under different working conditions, improving performance of the engine and reducing pollutant discharge. The two-channel EGR regulating device comprises a pipeline a which is led out from an engine exhaust pipe and is provided with a cooler and a pipeline b which is provided with a pipeline b insulating layer, the pipeline a and the pipeline b are respectively used for acquiring low temperature EGR and high temperature EGR, an ECU calculates valve openings of EGR temperature regulating valves according to the current working condition of the engine as well as EGR temperatures in the pipeline a and thepipeline b, the ECU controls the EGR temperature regulating valves to mix the low temperature EGR and the high temperature EGR in a certain ratio, so as to obtain EGR at the required temperature, an EGR system can be beneficially started under multiple working conditions, burning condition is improved, and oil consumption is reduced. The invention also discloses an EGR control method used for optimizing EGR control and a ratio adjustable EGR temperature regulating valve.

Hu Yunfeng

Papers

Combined low-temperature cold starting device for fuel cell power system and control method

Modeling and Integrated Optimization of Power Split and Exhaust Thermal Management on Diesel Hybrid Electric Vehicles

Fuel cell power system combined low-temperature cold starting device

SCR (selective catalytic reduction) system transient NH3 leakage control system and method for supercharged diesel engine

Two-channel EGR regulating device and control method thereof