Vehicle hill starting method and system, automobile and storage medium

Abstract

The invention relates to the technical field of vehicles, in particular to a vehicle hill starting method and system, an automobile and a storage medium, and the method comprises the steps that a whole automobile is braked in response to a hill starting signal; on the basis of the vehicle weight information of the vehicle and the gradient information of the ramp where the vehicle is located, the gearbox target output torque needed by ramp starting of the vehicle is calculated; the rotating speed and the first output torque of an engine of the vehicle are monitored in real time, and the actual output torque of a gearbox is calculated; when the actual output torque of the gearbox is equal to the target output torque of the gearbox, the braking force is released. According to the method, the accuracy of the braking force release time is ensured, and the adverse effect on the driving experience of a driver due to too early or too late release is effectively avoided, so that the stability and comfort of hill starting are realized.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a vehicle ramp starting method, system, vehicle and storage medium. Background Art

[0002] As automotive electronic technology continues to advance, the automotive electronics industry is becoming more and more intelligent. The market demand for the hill start function of manual transmissions is increasing. The hill start function can simplify the driver's starting process on a slope, enhance the smoothness of starting, and bring a comfortable driving experience to the driver.

[0003] However, the hill start function is currently only popularized in automatic transmissions and has not been successfully applied to manual transmissions. The reason is that compared with automatic transmissions, manual transmissions cannot determine the actual torque required for starting, so the braking system cannot obtain the release time of the driving air chamber pressure when starting on a hill. Too early or too late will have a great impact on the driver's experience. Summary of the invention

[0004] Based on the above technical problems, the present invention provides a vehicle hill start method, system, vehicle and storage medium.

[0005] The present invention provides a method for starting a manual vehicle on a hill, comprising: braking the entire vehicle in response to a hill start signal; calculating a gearbox target output torque required for the vehicle to start on a hill based on vehicle weight information and slope information of the ramp on which the vehicle is located; real-time monitoring of the vehicle's engine speed and the first engine output torque to calculate the gearbox actual output torque; and releasing the braking force when the gearbox actual output torque is equal to the gearbox target output torque.

[0006] According to a method for starting a manual vehicle on a hill provided by the present invention, a target output torque of a transmission required for the vehicle to start on a hill is calculated based on vehicle weight information and slope information of the slope on which the vehicle is located, including: determining the vehicle weight information and slope information of the slope on which the vehicle is located; determining the target output torque of the transmission required for the vehicle to start on a hill based on the vehicle weight information, the slope information and a first calibration curve, wherein the first calibration curve contains a correspondence between the slope information, the vehicle weight information and the target output torque of the transmission.

[0007] According to a method for starting a manual vehicle on a slope provided by the present invention, a method for obtaining slope information includes: obtaining the longitudinal acceleration and vertical acceleration of gravity of the vehicle; and determining the current slope information of the vehicle based on the longitudinal acceleration and vertical acceleration of gravity.

[0008] According to a method for starting a manual transmission vehicle on a hill provided by the present invention, before the vehicle starts on a hill, the method includes: obtaining vehicle speed information and a second engine output torque of the vehicle during operation before the vehicle stops or is turned off; and determining vehicle weight information based on the vehicle speed information and the second engine output torque.

[0009] According to a manual transmission vehicle hill starting method provided by the present invention, vehicle weight information is determined based on vehicle speed information and a second output torque of the engine, including: determining initial vehicle weight information based on the vehicle speed information and the second output torque of the engine; obtaining the braking pressure and braking deceleration of the vehicle during operation; and determining the vehicle weight information based on the braking pressure, braking deceleration and initial vehicle weight information.

[0010] According to a method for starting a manual vehicle on a hill provided by the present invention, the speed of the vehicle's engine and the first output torque of the engine are monitored in real time, and the actual output torque of the transmission is calculated, including: monitoring the speed of the vehicle's engine and the first output torque of the engine in real time; determining the actual output torque of the transmission based on the speed, the first output torque of the engine and a second calibration curve, wherein the second calibration curve includes a correspondence between the speed, the engine output torque and the actual output torque of the transmission.

[0011] According to a method for starting a manual transmission vehicle on a hill, the method further includes: when the actual output torque of the transmission is greater than the target output torque of the transmission, completing the hill start.

[0012] The present invention also provides a manual transmission vehicle hill start system, comprising: A brake module, used for braking the entire vehicle in response to a hill start signal; A target output torque calculation module, used to calculate the gearbox target output torque required for the vehicle to start on a hill based on the vehicle weight information and the slope information of the slope on which the vehicle is located; The actual output torque calculation module is used to monitor the speed of the engine and the first output torque of the engine of the vehicle in real time and calculate the actual output torque of the gearbox; The braking force release module is used to release the braking force when the actual output torque of the transmission is equal to the target output torque of the transmission.

[0013] The present invention also provides an automobile, which uses the above-mentioned manual transmission vehicle ramp starting method.

[0014] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method for starting a manual transmission vehicle on a hill when executing the computer program.

[0015] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for starting a manual transmission vehicle on a hill is implemented as described above.

[0016] The present invention also provides a computer program product, including a computer program, which implements the above-mentioned manual transmission vehicle hill start method when the computer program is executed by a processor.

[0017] The vehicle hill start method, system, vehicle and storage medium provided by the present invention calculate the target output torque of the transmission by utilizing vehicle weight information and slope information, and monitor the engine speed and output torque in real time to obtain the actual output torque of the transmission. When the actual output torque reaches the target output torque, the braking force is intelligently released, thereby ensuring the accuracy of the braking force release time and effectively avoiding the adverse effects on the driver's driving experience caused by releasing too early or too late, thereby achieving the stability and comfort of hill starting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 The present invention is a flowchart of a method for starting a manual vehicle on a hill.

[0020] Figure 2 It is a schematic diagram of a control system using the manual transmission vehicle hill start method provided by the present invention.

[0021] Figure 3 It is a schematic flow chart of another method for starting a manual transmission vehicle on a hill provided by the present invention.

[0022] Figure 4 The diagram is a schematic structural diagram of a manual transmission vehicle hill start system provided by the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Figure 1FIG. 1 is a flow chart of a method for starting a manual vehicle on a hill provided by the present invention. Figure 1 As shown, the method includes the following: Step 101: In response to a hill start signal, braking of the vehicle is performed.

[0025] Specifically, when a vehicle is parked on a slope and receives a hill start signal (which may be the driver's operation, such as stepping on the brakes and preparing to start or pressing the hill start assist switch, or the vehicle's automatic system detecting that a hill start is required), in order to prevent the vehicle from sliding down due to gravity during the starting process, the vehicle will first brake to ensure that it will not slide down due to gravity during the starting process.

[0026] For example, the brake fluid is delivered to the service brake air chamber through the brake system to maintain the internal pressure at a certain level to achieve vehicle braking, ensuring that the vehicle is in a stable state before starting, providing safety protection for subsequent starting actions.

[0027] Step 102: Calculate the target output torque of the transmission required for the vehicle to start on a hill based on the vehicle weight information and the slope information of the slope on which the vehicle is located.

[0028] In one embodiment of the present invention, the vehicle weight information refers to the total mass or weight of the vehicle. The slope information refers to the inclination of the slope on which the vehicle is located. The gearbox target output torque refers to the torque value expected to be output by the gearbox when the vehicle starts on a slope, so as to ensure that the vehicle can start smoothly and overcome the resistance of the slope. By obtaining the vehicle weight information and the slope information of the slope on which the vehicle is located, the target output torque required for the vehicle to start can be calculated.

[0029] Step 103: monitor the speed of the engine and the first output torque of the engine of the vehicle in real time, and calculate the actual output torque of the transmission.

[0030] In one embodiment of the invention, the actual output torque of the gearbox is an important indicator for measuring the power performance of the vehicle. By real-time monitoring of the engine speed and the first output torque of the engine and calculating the actual output torque of the gearbox, the power output of the vehicle in the current state can be understood in real time, and then the power performance of the vehicle can be evaluated to see whether it meets the driving requirements.

[0031] For example, after the driver shifts gears and steps on the accelerator, the engine speed and the first output torque of the engine of the vehicle are monitored in real time to calculate the actual output torque of the transmission.

[0032] Step 104: When the actual output torque of the transmission is equal to the target output torque of the transmission, the braking force is released.

[0033] In one embodiment of the present invention, when the actual output torque of the transmission is equal to the target output torque of the transmission, it indicates that a hill start can be performed, and at this time, the braking force needs to be released to enable the vehicle to achieve a hill start.

[0034] For example, when the actual output torque of the transmission is calculated to have reached the transmission target torque required for starting based on the real-time monitored engine speed and the first output torque of the engine, the brake release operation will be performed, which can ensure that the vehicle starts smoothly on the slope.

[0035] In summary, according to the technical solution provided by the embodiment of the present invention, the target output torque of the transmission is calculated by utilizing the vehicle weight information and the slope information, and the engine speed and output torque are monitored in real time to obtain the actual output torque of the transmission. When the actual output torque reaches the target output torque, the braking force is released intelligently to ensure the accuracy of the braking force release time, effectively avoiding the adverse effects on the driver's driving experience caused by releasing too early or too late, thereby achieving smoothness and comfort when starting on a slope.

[0036] Furthermore, the manual transmission vehicle hill start method also includes: when the actual output torque of the transmission is greater than the target output torque of the transmission, completing the hill start.

[0037] Specifically, based on real-time monitoring of the engine speed and the first output torque of the engine, the actual output torque of the gearbox is calculated. When the actual output torque of the gearbox is greater than the target output torque of the gearbox, the vehicle will successfully complete the hill start and continue to move forward under the impetus of the actual output torque of the gearbox.

[0038] Further based on the vehicle weight information and the slope information of the slope on which the vehicle is located, the gearbox target output torque required for the vehicle to start on a hill is calculated, including: Determine vehicle weight information and slope information of the ramp on which the vehicle is located; Based on the vehicle weight information, the slope information and the first calibration curve, the gearbox target output torque required for the vehicle to start on a hill is determined, wherein the first calibration curve includes a correspondence between the slope information, the vehicle weight information and the gearbox target output torque.

[0039] In one embodiment of the present invention, the vehicle weight information and the slope information can be obtained by different methods. For example, the slope information can be calculated by a control module with an integrated slope sensor, or by a method built into a map, that is, the vehicle position is obtained by position detection, and then the slope information of the current position of the vehicle is obtained according to the map. The vehicle weight information can be calculated by a control module with an integrated slope sensor, or by using the vehicle's inertial sensor to estimate the vehicle weight by analyzing the dynamic changes of the vehicle during acceleration or braking. Or a pressure sensor is installed in the vehicle's suspension system or tire to estimate the vehicle weight by measuring the pressure on the tire or suspension system. Or the vehicle weight is pre-stored before the vehicle stops or turns off. The first calibration curve is a predefined curve that contains the corresponding relationship between the slope information, the vehicle weight information and the target output torque of the gearbox. Using this calibration curve, the target output torque of the gearbox required for the vehicle to start on a hill under current conditions can be determined by looking up the table according to the vehicle weight and slope information.

[0040] In summary, according to the technical solution provided by the present invention, by accurately calculating the target output torque of the transmission required for the vehicle to start on a slope, it is ensured that the vehicle can start smoothly under various slope conditions, which not only improves driving safety and comfort, but also optimizes energy consumption and emissions, and has important practical application value.

[0041] Furthermore, the method for obtaining slope information includes: Obtain the longitudinal acceleration and vertical acceleration of gravity of the vehicle; Based on the longitudinal acceleration and the vertical acceleration due to gravity, the vehicle's current slope information is determined.

[0042] In one embodiment of the present invention, the longitudinal acceleration refers to the acceleration of the vehicle along its direction of motion, which can be measured by an acceleration sensor on the vehicle. The vertical acceleration due to gravity refers to the vertical downward acceleration caused by the earth's gravity, which is constant and does not need to be measured by a sensor. The slope information can be determined by calculating the components of the longitudinal acceleration of the vehicle and the vertical acceleration due to gravity.

[0043] In summary, according to the technical solution provided by the embodiment of the present invention, by real-time measurement of the vehicle's longitudinal acceleration and gravity vertical acceleration, the slope information of the vehicle can be accurately determined, thereby improving driving safety and experience, adapting to different road conditions, reducing errors, considering the slope change rate, and providing important data support for vehicle control and energy management.

[0044] Furthermore, before the vehicle starts on a hill, the method includes: Before the vehicle stops or turns off, obtaining vehicle speed information and a second output torque of the engine during operation; Vehicle weight information is determined based on the vehicle speed information and the second engine output torque.

[0045] In one embodiment of the present invention, the second engine output torque refers to the torque value output by the engine during the operation of the vehicle. Before the vehicle stops or turns off, when the vehicle is traveling on a horizontal road, the vehicle weight information can be calculated by obtaining the vehicle speed and the second engine output torque.

[0046] Specifically, the vehicle weight information can be calculated by the following formula: F=ma Among them, F is the force provided by the engine (if other forces acting on the vehicle are not considered), m is the mass of the vehicle (i.e. the weight of the vehicle), and a is the acceleration of the vehicle. By measuring the acceleration of the vehicle and the force provided by the transmitter, the mass of the vehicle can be solved, and the acceleration can be calculated by the vehicle speed.

[0047] For example, more accurate vehicle weight information may be obtained by the following method: After obtaining the real-time vehicle speed, the average deceleration a=(v2-v1) / (t2-t1) during this period can be calculated based on the speed difference between two different time points. During this period, the force of the vehicle provides driving force for the output torque of the engine to drive the vehicle forward. By calculating the average output torque during this period, the average driving force F1 during this period can be obtained. However, during the vehicle's forward movement, the vehicle will also receive friction from the ground. Therefore, the total force of the vehicle is F=F1-F2, and the mass m=(F1-F2) / ((v2-v1) / (t2-t1)) can be obtained. However, since the road conditions are not exactly the same during the operation of the vehicle and there are some losses such as wind resistance, in order to make the calculated vehicle weight closer to accuracy, at least three or more shift intervals are used to measure the calculated vehicle weight at different vehicle speeds for correction, and at least three or more calculations are used to fit a vehicle weight value. If the values ​​of the three calculations are very different, continue sampling and take several groups of close values ​​for fitting to obtain the vehicle weight.

[0048] In summary, according to the technical solution provided by the present invention, through the above method, before starting on a slope, the vehicle can estimate the weight of the vehicle by analyzing the vehicle speed and engine output torque during operation and combining the principles of vehicle dynamics, thereby providing data support for the vehicle's hill start and overall performance optimization.

[0049] Further, based on the vehicle speed information and the second output torque of the engine, the vehicle weight information is determined, including: determining initial vehicle weight information based on the vehicle speed information and the second output torque of the engine; Obtain the braking pressure and braking deceleration of the vehicle during operation; Based on the brake pressure, the brake deceleration and the initial vehicle weight information, the vehicle weight information is determined.

[0050] In one embodiment of the present invention, vehicle speed information and the second output torque of the engine are used to estimate an initial vehicle weight information. During vehicle operation, the brake pressure and brake deceleration data can be obtained through the pressure sensor and acceleration sensor of the brake system. The vehicle weight information can be further calibrated and determined using the obtained brake pressure and brake deceleration in combination with the initial vehicle weight information. During braking, the deceleration of the vehicle is affected not only by the vehicle weight, but also by the brake pressure. By measuring the brake deceleration and the known brake pressure, the actual deceleration of the vehicle during braking can be estimated, and then the mass of the vehicle can be inferred to determine the vehicle weight information.

[0051] Exemplarily, the brake pressure can be obtained based on the product of the actual collected air pressure value of the brake chamber and the brake torque gradient of the brake. The vehicle weight is mainly corrected in the following ways. During the driver's braking process, according to F=ma, during the braking process, the driver's brake pedal opening corresponds to the deceleration. When the driver steps on the pedal to a certain depth, the deceleration required for braking is actually determined. Since the vehicle weight has been calculated and the deceleration is known, F=ma can be used to know how much braking force can achieve the target deceleration. When the actual braking force applied by air pressure does not reach the target deceleration, the vehicle weight can be corrected by the difference between the actual deceleration and the target deceleration.

[0052] In summary, according to the technical solution provided by the present invention, since the initial vehicle weight information may have errors, the vehicle weight can be calibrated and corrected in combination with the actual data during the braking process to obtain more accurate vehicle weight information. The above method can improve the accuracy of vehicle weight estimation, which is of great significance for vehicle performance optimization, safety system calibration, and load management.

[0053] Furthermore, real-time monitoring of the engine speed and the first output torque of the engine of the vehicle and calculation of the actual output torque of the gearbox include: Real-time monitoring of the engine speed and the first output torque of the engine of the vehicle; Based on the rotational speed, the first output torque of the engine and the second calibration curve, the actual output torque of the transmission is determined, wherein the second calibration curve includes a corresponding relationship between the rotational speed, the first output torque of the engine and the actual output torque of the transmission.

[0054] In one embodiment of the present disclosure, the first output torque of the engine refers to the torque value output by the engine after the driver shifts gears and steps on the accelerator. The engine speed and the first output torque of the engine can be monitored and acquired through the vehicle's sensor system. The second calibration curve can be a chart or a set of data, which describes the corresponding relationship between the actual output torque of the gearbox under different engine speeds and output torques. The second calibration curve can be determined by the vehicle manufacturer through experiments during the vehicle development and testing phase, and stored in the control unit of the vehicle. When the driver shifts gears and steps on the accelerator, the actual output torque of the gearbox can be calculated using the real-time monitored engine speed and the first output torque, combined with the second calibration curve.

[0055] For example, the second calibration curve can be calibrated in the following way: during the calibration phase, a torque output sensor is installed on the output shaft of the gearbox, the accelerator pedal is stepped on from 0, the output speed and output torque curve of the engine are recorded during the accelerator pedal step, and the torque data collected by the torque sensor of the output shaft of the gearbox are recorded at the same time, and a data table is generated using as many points as possible, so as to generate a relationship curve between the three based on the data of the sampling points. Since the maximum torque and torque output of different engines are different, the calibration should be based on the engine, and different engines need to be calibrated separately.

[0056] In summary, by real-time monitoring of the engine speed and the first output torque and combining with the second calibration curve, the actual output torque of the gearbox can be accurately calculated, which is crucial for the vehicle's powertrain control.

[0057] Figure 2 It is a schematic diagram of a control system using the manual transmission vehicle hill start method provided by the present invention.

[0058] like Figure 2 As shown, the control system 200 includes: a chassis control module 201 , an engine control module 202 , a calibration module 203 , an instrument module 204 , and a vehicle control module 205 .

[0059] The chassis control module 201 can autonomously perform the inflation and exhaust operations of the driving air chamber according to the instructions. It can receive the signal sent by the instrument module 204 through hard wire or soft switch, indicating that the driver needs to switch on the hill start. It can monitor the action of the brake pedal, and can maintain the air chamber pressure after the hill start function is activated and the driver releases the pedal. The chassis control module 201 mainly includes a solenoid valve, an air pressure sensor, a chassis central control unit, a driving brake, a driving brake air chamber, etc., wherein the solenoid valve and the air pressure sensor are arranged on one side of the air inlet of the driving air chamber.

[0060] Among them, the chassis central control unit is controlled by an independent single-chip microcomputer and has an independent power supply system, overload protection system, waterproof system, etc. It can perform real-time and accurate control of the opening and closing of the solenoid valve, can monitor the pressure of the driving air chamber in real time, can communicate with other modules of the vehicle, and can accurately identify faults in the system circuit.

[0061] Furthermore, the chassis control module 201 can calculate the current vehicle weight according to the output torque of the engine and the vehicle speed when the vehicle is running, and can correct the vehicle weight according to the relationship between the braking pressure and the deceleration during braking to obtain the most accurate vehicle weight information. At the same time, before the vehicle stops and turns off, it can store the most accurate vehicle weight signal during the vehicle operation stage, and can send the vehicle weight signal to the vehicle control module 205.

[0062] Furthermore, the chassis control module 201 can calculate the slope of the vehicle based on its own equipped gyroscope and other sensors, and perform verification and correction based on the GPS signal. At the same time, the calculated slope signal can be transmitted to the vehicle control module 205.

[0063] The engine control module 202 can identify the accelerator pedal opening signal, the engine speed signal at the current accelerator pedal opening, and the engine output torque signal. It can also establish a connection with the clutch switch to determine whether the clutch is engaged or not, and can output whether the manual transmission is in gear. At the same time, it can communicate in real time with the chassis control module 201 and the like.

[0064] The calibration module 203 can calibrate a first relationship curve (i.e., the aforementioned second calibration curve) among the three according to different engine speeds x, engine output torques y, and gearbox output shaft output torques z (i.e., the aforementioned actual gearbox output torques), i.e., z=f(x,y).

[0065] Furthermore, the calibration module 203 can also calibrate a second relationship curve (i.e., the aforementioned first calibration curve) of the transmission output torque (i.e., the aforementioned transmission target output torque) required for vehicle starting under different vehicle weights and slopes according to different slope values ​​i and different vehicle weights t.

[0066] Furthermore, the calibration module 203 may also transmit the calibrated first relationship curve and the second relationship curve to the vehicle control module 205 .

[0067] The instrument module 204 can output hard-wire switch signals and soft-switch signals; it can send the signal of the hill start switch to the chassis control module 201 by hard wire or soft switch. At the same time, the instrument module 204 can receive the hill start operation status signal sent by the chassis central control unit, and there is a conspicuous mark on the instrument module to inform the driver; the instrument module 204 can also read the air pressure signal of the air tank and transmit the real-time air pressure value to the chassis central control unit; the instrument module 204 can determine whether the current pressure meets the pressure maintenance condition according to the air tank pressure signal transmitted by the current instrument, and if it is insufficient, it will prompt the driver to inflate through the instrument.

[0068] The vehicle control module 201 can store a first relationship curve of engine speed x, engine output torque y, and gearbox output shaft output torque z. When the vehicle stops on a slope, the gearbox output torque (i.e., the aforementioned gearbox target output torque) required for the vehicle to start under the current vehicle state can be calculated through the first curve relationship according to the vehicle weight signal and the slope signal sent by the chassis control module.

[0069] The vehicle control module 205 can store a second relationship curve of the transmission output torque required for vehicle starting under different vehicle weights and slopes, and can compare the transmission output torque corresponding to the current engine output torque and speed in real time based on the second curve.

[0070] Furthermore, the vehicle control module 205 can monitor the clutch engagement state and determine whether the driver is in the gear-engaging start stage through this state. After obtaining the engine output speed and torque value required for the vehicle to start on a slope, when the output torque of the output shaft of the gearbox is equal to the gearbox output torque required for the vehicle to start, the vehicle control module 205 immediately sends a signal to the chassis control module 201 that the current power system output has reached the starting torque value and the service brake air pressure should be released immediately.

[0071] After receiving the exhaust command from the vehicle control module 205, the chassis control module 201 can activate the electromagnetic valve to perform exhaust operation, release the pressure in the service brake air chamber, so that the vehicle can start normally. When the chassis control module 201 starts to execute the exhaust command, it will send a signal that the hill start is in progress to the instrument module 204. After receiving this signal, the instrument module 204 will flash the hill start icon to remind the driver that the hill start is currently in progress. When the exhaust is completed, this signal stops sending. When the vehicle starts smoothly and the speed exceeds 5 kilometers, the hill start switch command becomes invalid.

[0072] Combination Figure 2 , Figure 3 It is a schematic flow chart of another method for starting a manual transmission vehicle on a hill provided by the present invention.

[0073] like Figure 3 As shown, the method for starting a manual transmission vehicle on a hill provided by the present invention specifically includes the following steps.

[0074] Step 301: The vehicle stops on a ramp.

[0075] Step 302: The driver presses the hill start switch.

[0076] Step 303: After the chassis control module recognizes the signal that the driver needs to start on a hill, it controls the solenoid valve to maintain the air chamber pressure.

[0077] Specifically, after the driver presses the hill start switch, the instrument module sends a hill start signal to the chassis control module. After receiving the hill start signal, the chassis control module maintains the pressure of the service brake air chamber through the solenoid valve.

[0078] Step 304: The chassis control module sends the slope and vehicle weight signals to the vehicle control module, and the vehicle control module calculates the torque required for starting (ie, the aforementioned gearbox target output torque).

[0079] Specifically, after the chassis control module obtains the current slope information and vehicle weight signal based on its own sensors, it sends these signals to the vehicle control module. After the vehicle control module receives the current slope information and vehicle weight information of the slope, the vehicle control module will calculate the transmission output torque required for hill starting at the current slope and the current vehicle weight (i.e. the aforementioned transmission target output torque).

[0080] Step 305: After the driver shifts gears and accelerates, the vehicle control module obtains the actual output torque of the transmission according to the actual speed and torque currently generated by the engine and the calibration curve (ie, the aforementioned second calibration curve).

[0081] Specifically, when the driver shifts gears and steps on the accelerator, the vehicle control module will calculate the actual gearbox output torque value based on the current engine output torque and the calibrated corresponding relationship curve.

[0082] Step 306 : After the actual output torque of the transmission reaches the required torque (ie, the aforementioned target output torque of the transmission), the vehicle control module feeds back the air pressure release signal to the chassis control module.

[0083] Specifically, when the actual output torque of the transmission reaches the torque value required for the vehicle to start on the current slope (i.e. the aforementioned target output torque of the transmission), the vehicle control module will send an air pressure release signal (i.e. information that the power system output torque has reached the starting requirement) to the chassis control module.

[0084] Step 307: After receiving the signal, the chassis control module releases the braking force.

[0085] Specifically, after the chassis control module receives this signal (i.e., the aforementioned air pressure release signal), it will release the braking force.

[0086] Step 308: As the output torque (ie, the actual output torque of the transmission) increases, the vehicle completes the starting process.

[0087] Specifically, as the actual output torque of the transmission increases, the vehicle completes the hill start operation.

[0088] For example, when the vehicle starts smoothly and the vehicle speed exceeds 5 kilometers, the hill start switch command disappears.

[0089] Figure 4 It is a functional block diagram of the manual transmission vehicle hill start system provided by the present invention.

[0090] like Figure 4 As shown, the manual transmission vehicle hill start system 400 provided according to the present invention includes: a braking module 401 , a target output torque calculation module 402 , an actual output torque calculation module 403 and a braking force release module 404 .

[0091] Further, the braking module 401 is used to brake the entire vehicle in response to the hill start signal; Further, the target output torque calculation module 402 is used to calculate the gearbox target output torque required for the vehicle to start on a hill based on the vehicle weight information and the slope information of the slope on which the vehicle is located; Furthermore, the actual output torque calculation module 403 is used to monitor the speed of the engine of the vehicle and the first output torque of the engine in real time, and calculate the actual output torque of the gearbox; Furthermore, the braking force releasing module 404 is used to release the braking force when the actual output torque of the transmission is equal to the target output torque of the transmission.

[0092] The present invention also provides an automobile, which uses the above-mentioned manual transmission vehicle ramp starting method.

[0093] In yet another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by a processor to perform the above-mentioned manual transmission vehicle hill start method.

[0094] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0095] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for starting a manual transmission vehicle on a hill, characterized in that: include: In response to a hill start signal, braking the entire vehicle; Calculating a target output torque of a transmission required for the vehicle to start on a hill based on vehicle weight information and slope information of the ramp on which the vehicle is located; monitoring the speed of the engine and the first output torque of the engine of the vehicle in real time, and calculating the actual output torque of the gearbox; When the actual output torque of the transmission is equal to the target output torque of the transmission, the braking force is released.

2. The method for starting a manual transmission vehicle on a hill according to claim 1, characterized in that: The step of calculating the target output torque of the transmission required for the vehicle to start on a hill based on the vehicle weight information and the slope information of the ramp on which the vehicle is located comprises: Determining vehicle weight information and slope information of the ramp on which the vehicle is located; The transmission target output torque required for the vehicle to start on a hill is determined based on the vehicle weight information, the slope information and a first calibration curve, wherein the first calibration curve contains a correspondence between the slope information, the vehicle weight information and the transmission target output torque.

3. The method for starting a manual vehicle on a hill according to claim 2, characterized in that: The method for obtaining the slope information comprises: Obtaining the longitudinal acceleration and vertical acceleration of gravity of the vehicle; Based on the longitudinal acceleration and the vertical acceleration due to gravity, information on the slope on which the vehicle is currently located is determined.

4. The method for starting a manual transmission vehicle on a hill according to claim 2, characterized in that: Before the vehicle starts on a hill, the method includes: Before the vehicle stops or shuts down, obtaining vehicle speed information and a second output torque of the engine during operation of the vehicle; The vehicle weight information is determined based on the vehicle speed information and the second engine output torque.

5. The method for starting a manual transmission vehicle on a hill according to claim 4, characterized in that: The determining the vehicle weight information based on the vehicle speed information and the second output torque of the engine includes: determining initial vehicle weight information based on the vehicle speed information and the second output torque of the engine; Obtaining the braking pressure and braking deceleration of the vehicle during operation; The vehicle weight information is determined based on the brake pressure, the brake deceleration, and the initial vehicle weight information.

6. The method for starting a manual transmission vehicle on a hill according to claim 1, characterized in that: The real-time monitoring of the rotation speed and the first output torque of the engine of the vehicle and the calculation of the actual output torque of the gearbox include: Real-time monitoring of the rotation speed and first output torque of the engine of the vehicle; The actual output torque of the transmission is determined based on the rotational speed, the first output torque of the engine and a second calibration curve, wherein the second calibration curve includes a corresponding relationship among the rotational speed, the first output torque of the engine and the actual output torque of the transmission.

7. The method for starting a manual vehicle on a hill according to claim 1, characterized in that: The method further comprises: When the actual output torque of the transmission is greater than the target output torque of the transmission, the hill start is completed.

8. A manual transmission vehicle hill start system, characterized in that: include: A brake module, used for braking the entire vehicle in response to a hill start signal; A target output torque calculation module, used to calculate the gearbox target output torque required for the vehicle to start on a hill based on vehicle weight information and slope information of the slope on which the vehicle is located; An actual output torque calculation module, used for monitoring the speed of the engine of the vehicle and the first output torque of the engine in real time, and calculating the actual output torque of the gearbox; The braking force release module is used to release the braking force when the actual output torque of the transmission is equal to the target output torque of the transmission.

9. A car, characterized in that: The automobile uses the manual transmission vehicle hill starting method as described in any one of claims 1-7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for starting a manual transmission vehicle on a hill is implemented as described in any one of claims 1 to 7.

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