40results about How to "Guaranteed fuel economy" patented technology

The embodiment of the invention provides an in-loop rapid simulation test system of an unmanned vehicle. The system comprises: a virtual simulation test subsystem used for generating a virtual test scene and transmitting a pavement state control instruction to a test bench control subsystem; the test bench control subsystem used for simulating a pavement state, as well as estimating the driving performance of the unmanned vehicle according to driving parameters of the unmanned vehicle; and an unmanned vehicle control subsystem used for performing driving control on the unmanned vehicle according to the virtual test scene. The above system adopts the simulation test mode of combining the virtual reality technology with the hardware in-loop, so that a controllable, repeatable and effective in-loop rapid simulation test of the unmanned vehicle can be achieved indoors; and furthermore, all extreme or special road conditions are exhausted as much as possible, so that the safety and the reliability of the unmanned vehicle before start off can be fully guaranteed. The embodiment of the invention further provides an in-loop rapid simulation test method of the unmanned vehicle.

The invention discloses an automatic speed changer gear shifting point predicting control method based on a vehicle-mounted navigation system. The method comprises the steps that firstly, current vehicle structure parameters, state parameters and power transmission system parameters are determined; secondly, front road feature parameters are extracted; thirdly, the future vehicle state is predicted on the basis of the feature parameters; fourthly, work condition division is conducted according to the future vehicle state, the speed changer gear meeting the needed torque and the rotation speedneeded by an engine is selected, the fuel consumption rate corresponding to the gear is calculated, the gear where the fuel consumption rate is the lowest serves as the predicted target gear, the changing difference value between the current gear and the predicted target gear is calculated, and work condition division is conducted; and fifthly, the optimal gear shifting method is formulated for different work conditions. On the premise that dynamic performance, driving controllabitity and safety are guaranteed, rolling optimization of gear shifting points can be achieved, the automatic speed changer gear shifting point predicting control method better adapts to the whole vehicle dynamic character, and optimal matching of the dynamic performance and economic efficiency is achieved.

The invention discloses an input split type hybrid power flow control method and relates to the technical field of vehicle hybrid power. The method comprises, based on the input split type rotating speed and rotating torque coupling relationship, enabling an engine to be in a rotating speed control mode, and a generator and an electromotor to be in a rotating torque control mode; starting from the target power of a battery pack and a driving required power and based on an optimal fuel economy working curve, determining the working points of the engine, the generator and the electromotor, and meanwhile, ensuring the balance between electric quantity and power of batteries. According to the input split type hybrid power flow control method, firstly, the driving required power and the target power of the battery pack are determined, so that under the premise of ensuring vehicle dynamic performance, the regulating manner of the generator and every electromotor can be determined according to the characteristics of a input split type hybrid power system and accordingly the working points of every power unit can be adjusted flexibly, and further the fuel economy can be enhanced; through power flow control, the power and the electric quantity of the batteries can be in a reasonable state, over-charging or over-discharging of the batteries can be avoided, the system performance can be improved and the service life of the batteries can be prolonged.

The invention aims to provide an electromagnetic control pressure-storage and pressure-stabilizing oil sprayer. The oil sprayer comprises an oil sprayer head, an oil sprayer body, a flow limiting assembly, a needle valve reset spring, a spray nozzle, a needle valve, a cap nut, an electromagnetic valve assembly and a locking sleeve. The structure of the flow limiting assembly is adopted in the oil sprayer, therefore, fuel oil economy reduction caused due to the fact that the oil sprayer sprays oil abnormally and interruptedly can be effectively avoided and the working reliability of oil sprayer is guaranteed. A pressure storage cavity in the oil sprayer body can reduce pressure fluctuation caused in the fuel oil injection process and facilitate accurate control over oil spraying stability. Meanwhile, when the oil sprayer is used in a common rail fuel oil system, the structural size of a common rail pipe can be reduced, therefore, the requirements for strength of materials of the common rail pipe are reduced, the service life can be prolonged and the spatial utilization rate can be increased. The action process of the needle valve is directly driven by a solenoid valve, the response speed of the needle valve is high, the control precision is high, oil spraying is regular, flexible and changeable, the dynamic property and the economy of a diesel engine are effectively improved, and therefore the diesel engine can meet stricter emission regulations.

The invention provides an energy management system for a range extending type electric car and a method thereof. The energy management system comprises a car controller, a power battery, an energy input part and an energy output part; the car controller is connected with the power battery through low-voltage wires, the energy input part and the energy output part are connected with the power battery, the energy input part comprises a range extender unit and a driving and energy recovery unit, and the energy output part comprises a high-voltage auxiliary unit and a driving and energy recovery unit. The method comprises the steps that firstly, first-order regulation is performed on the energy input part and the energy output part through thresholds; secondly, further second-order regulation is performed on the energy input part and the energy output part according to SOC, the state of charge of the power battery, and the efficiency of the energy management system is effectively improved.

A gear recommending method for an AMT vehicle in a manual mode comprises the following steps that (a) when the vehicle operates, a terminal control unit (TCU) checks the running mode of the AMT vehicle; (b) whether a gear function key F on a gear shifting handle is pressed for more than N seconds or not is detected; (c) the TCU sends the current gear n1 and a recommended gear n2 to a controller area network (CAN) bus; (d) an instrument controller (CBCU) receives the current gear n1 and the recommended gear n2 from the CAN bus; (e) the CBCU judges whether n1 is equal to n2; (f) if n1 is not equal to n2, the CBCU controls an alarm device to give out an alarm after M seconds; and (g) the TCU checks the running mode, and if the manual mode of the AMT is off, the TCU quits from a recommended gear module in the manual mode. By adoption of the steps, in the manual mode of the AMT vehicle, a driver can still choose a proper running gear according to a prompt on an instrument panel.

The invention provides a vehicle second-level oil pump control system and method. The method includes the steps of generating a control signal on the basis of at least one control parameter, and changing the working state of a second-level oil pump on the basis of the control signal. The vehicle second-level oil pump control system and method can accurately control the working state of the second-level oil pump.

The invention discloses a dual-motor hybrid driving system. The system includes a first driving part and a second driving part which are used for driving axles. The first driving part includes an engine, a first gear pair, a clutch and a first motor which are connected in a power transmission direction in sequence. The second driving part includes a second motor, wherein the transmission ratio ofthe first gear pair is smaller than 1. By means of the scheme, the engine can work within a rotation speed range, and meanwhile, the size of the motors are reduced, wherein the fuel economy within therotation speed range is great.

The invention discloses a water temperature control method of an AMT vehicle type hydraulic retarder and a control method thereof, which comprise a vehicle body control unit BCU, an engine electronic control unit ECU, an automatic transmission electronic control unit TCU, a gear box executing mechanism and a hydraulic retarder, wherein the engine electronic control unit ECU, the automatic transmission electronic control unit TCU and the hydraulic retarder are respectively connected to the vehicle body control unit BCU. According to the invention, the beneficial effects are: the reliable safety performance when a vehicle is driven downhill is ensured; at the same time, when an engine is ensured to work within reasonable work temperature range, the engine fuel economy performance is ensured; when the retarder has sufficient brake torque during downhill, the damage to a friction piece is reduced by slight using or disusing a main brake to brake; at the same time, a water tank watering the friction piece during downhill can be eliminated, thus more goods can be carried; and the value at the safety and economy aspects is high.

The invention provides a mode switching system and method for a hybrid electric vehicle with the function of external connection. The mode switching system comprises a manual button, a central processing unit, an electric motor flywheel rotating speed sensor, an engine flywheel rotating speed sensor, an engine controller and an electric motor controller, wherein the manual button is used for performing system mode manual switching by a driver; the central processing unit is used for receiving and transmitting electrical signals of the manual button, the electric motor flywheel rotating speed sensor, the engine flywheel rotating speed sensor, the electric motor controller and the engine controller; the electric motor controller is used for controlling the operation of an electric motor; the engine controller is used for controlling the operation of an engine; the electric motor flywheel rotating speed sensor is used for collecting a flywheel rotating speed signal of the electric motor; the engine flywheel rotating speed sensor is used for collecting a flywheel rotating speed signal of the engine. Through the adoption of the mode switching system disclosed by the invention, frequent charging processes and frequent discharging processes of an accumulator group are avoided, the service life of an accumulator is prolonged, and the operational efficiency of the accumulator is improved.

The invention discloses an automobile quick starting method, device and equipment and a storage medium. The automobile quick starting method comprises the steps that the current shutdown phase of an engine of an automobile is obtained, wherein the shutdown phase comprises a first shutdown phase stored in a first electronic control unit of the automobile and a second shutdown phase stored in a second electronic control unit of the automobile; whether a difference value between the first shutdown phase and the second shutdown phase is within a preset threshold range or not is judged; and if the difference value is within the preset threshold value range, the first shutdown phase or the second shutdown phase serves as a target phase of the engine to complete synchronization of a target crankshaft signal. Whether the current shutdown phases stored in two electronic control units meet the preset conditions or not is judged, whether the current shutdown phases stored in the two electronic control units are directly used for starting the engine of the automobile or not is judged, quick starting of the engine can be achieved, and the time consumed for starting synchronous identification of the engine of the automobile is shortened.

In order to solve the technical problem that an existing dual-output transmission automatic transmission has high requirements for synchronous control precision of two motors, the invention provides adual-output transmission automatic transmission. A special transmission line is designed, as long as three planet rows meet a specific speed ratio relation, it can be guaranteed that the rotating speed of the first output shaft and the rotating speed of the third output shaft are the same in a straight moving mode, and the requirement for the synchronous control precision of the two driving motors is avoided; moreover, an internal combustion engine or a driving motor can be switched to provide power according to different working conditions, and when the power provided by the internal combustion engine is excessive, the first driving motor can be changed into a generator to convert and store excessive energy or provide the excessive energy to the second driving motor, so that the internalcombustion engine can always work at the position of the optimal efficiency point, and the fuel economy is ensured.