Vehicle braking control method and device under long downhill condition

Abstract

The invention relates to a vehicle braking control method and device under the long downhill condition, and belongs to the technical field of vehicle control The vehicle braking control method under the long downhill condition comprises the steps that under the condition that a vehicle is located on a long downhill road section, the braking strength currently needed by the vehicle is determined based on the current vehicle speed, the current road gradient and the whole vehicle mass; the braking mode of the vehicle is determined based on the braking strength currently needed by the vehicle, and the braking mode is determined by braking power generated by the number of braking air cylinders; and the braking mode is adjusted based on the vehicle speed keeping condition and the air inlet temperature change condition of the vehicle. According to the invention, the vehicle speed stability control of the long downhill can be realized under the condition that a retarder is not arranged, and the cost of the whole vehicle is reduced while a certain braking power is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a vehicle braking control method and device under long downhill conditions. Background Art

[0002] At present, when vehicles are going down a long slope, most of them use exhaust brakes, conventional cylinder brakes, retarder brakes and other actuators for combined braking to maintain the stability of the vehicle speed during the long slope and ensure the safety of driving. However, the use of retarder braking is not only costly and increases the weight of the vehicle, but also makes the vehicle layout more complicated; the use of exhaust brakes and conventional cylinder brakes will lead to insufficient braking force, making it difficult for the vehicle to maintain speed during the long slope; in the case of a large slope, the gearbox may be frequently used for shifting.

[0003] The existing braking solutions for vehicles in the process of going down a long slope are relatively costly and are prone to insufficient braking power. Summary of the invention

[0004] In view of this, it is necessary to provide a vehicle braking control method and device in a long downhill situation to solve the problem that the current vehicle braking solution is high in cost and prone to insufficient braking power in the process of going down a long slope.

[0005] In order to solve the above problems, the present invention provides a vehicle braking control method in a long downhill situation, comprising: When the vehicle is on a long downhill section, the braking intensity currently required by the vehicle is determined based on the current vehicle speed, road slope and vehicle mass; Determining a braking mode of the vehicle based on the braking intensity currently required by the vehicle, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; The braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0006] In a possible implementation, determining the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass includes: Determine the auxiliary braking force currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass; When the auxiliary braking force currently required by the vehicle is greater than a preset threshold, determining that the braking intensity currently required by the vehicle is the first level; When the auxiliary braking force currently required by the vehicle is less than or equal to a preset threshold, it is determined that the braking intensity currently required by the vehicle is the second level.

[0007] In a possible implementation, determining the braking mode of the vehicle based on the braking intensity currently required by the vehicle includes: When the braking intensity currently required by the vehicle is the first level, determining that the number of brake cylinders of the vehicle is the first number, and the braking power is the first power; When the braking intensity currently required by the vehicle is the second level, determining that the number of brake cylinders of the vehicle is the second number and the braking power is the first power; The first quantity is twice the second quantity, and the first power is greater than the second power.

[0008] In a possible implementation, adjusting the braking mode based on the vehicle speed maintenance and intake air temperature change includes: When it is determined that the number of brake cylinders of the vehicle is the second number and the brake power is the second power, if the vehicle speed is less than the first speed threshold, adjusting the brake power to a third power, wherein the third power is less than the second power; If the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, adjusting the braking mode based on the change in the intake air temperature of the vehicle; If the vehicle speed is greater than a second speed threshold, the number of brake cylinders of the vehicle is adjusted to a first number, the braking power is adjusted to a first power, and the braking mode is adjusted based on the vehicle speed maintenance and intake air temperature changes.

[0009] In a possible implementation, adjusting the braking mode based on a change in intake air temperature of the vehicle includes: When the intake air temperature of the vehicle is less than or equal to the first temperature threshold, or when the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is less than or equal to the first preset time, the number of brake cylinders of the vehicle is maintained at a second number, and the brake power remains unchanged at a second power; When the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is greater than the first preset time length, the braking power is adjusted to the third power and the engine cooling fan is turned on.

[0010] In a possible implementation, adjusting the braking mode based on the vehicle speed maintenance and intake air temperature change includes: When it is determined that the number of brake cylinders of the vehicle is the first number and the brake power is the first power, if the vehicle speed is less than the first speed threshold, the brake power is adjusted to a fourth power, and the magnitude relationship among the first power, the second power, the third power and the fourth power is: the first power> the fourth power> the second power> the third power; If the vehicle speed is greater than or equal to the first speed threshold, the braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0011] In a possible implementation, adjusting the braking mode based on the vehicle speed maintenance and intake air temperature change includes: When the vehicle speed is greater than a second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to a second preset time, turning on the engine cooling fan; If the vehicle's intake air temperature is greater than the second temperature threshold and the holding time is greater than the second preset time, adjusting the braking power to a fourth power and turning on the engine cooling fan; When the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to the second preset time, the number of brake cylinders of the vehicle is maintained at the first number, and the brake power remains unchanged at the first power; If the intake air temperature of the vehicle is greater than the second temperature threshold and is maintained for a time greater than a second preset time length, the braking power is adjusted to a fourth power and the engine cooling fan is turned on.

[0012] In a possible implementation, the method further includes: After the braking power is adjusted to the fourth power, if the vehicle speed is less than the first speed threshold, the number of brake cylinders of the vehicle is adjusted to the second number, and the braking power is adjusted to the second power.

[0013] In a possible implementation, the method further includes: After the engine cooling fan is turned on, if the vehicle speed is greater than the second speed threshold, the current braking mode is maintained unchanged and a transmission downshift prompt is issued.

[0014] The present invention also provides a vehicle braking control device in a long downhill situation, comprising: The first determination module is used to determine the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass when the vehicle is on a long downhill section; A second determination module is used to determine a braking mode of the vehicle based on the braking intensity currently required by the vehicle, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; The adjustment module is used to adjust the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0015] The present invention also provides an electronic device, including a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the vehicle braking control method in the long downhill condition as described above is implemented.

[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the vehicle braking control method in the long downhill condition as described above is implemented.

[0017] The beneficial effects of the present invention are as follows: the vehicle braking control method and device provided by the present invention in the case of a long downhill slope first determine the auxiliary braking force currently required by the vehicle through the operating parameters of the vehicle on the long downhill section, and then determine the braking intensity currently required by the vehicle according to the auxiliary braking force currently required by the vehicle, clarify the current braking demand of the vehicle, and then determine the corresponding number of brake cylinders and braking power according to the current braking demand of the vehicle, and finally determine whether the current braking mode can meet the braking demand through the vehicle speed maintenance situation and the intake temperature change situation, and adjust the braking mode so that the braking mode is matched with the braking demand to avoid waste of resources. The present invention can achieve stable speed control of the vehicle on a long downhill slope without setting a retarder, while ensuring a certain braking power, reducing the cost of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of an embodiment of a vehicle braking control method under a long downhill slope provided by the present invention; Figure 2 A schematic flow chart of an embodiment of a vehicle braking overall control process under a long downhill slope provided by the present invention; Figure 3 A schematic structural diagram of an embodiment of a vehicle braking control system under a long downhill slope provided by the present invention; Figure 4 A schematic flow chart of an embodiment of a vehicle braking control process under a long downhill slope provided by the present invention; Figure 5 A schematic structural diagram of an embodiment of a vehicle braking control device for a long downhill slope provided by the present invention; Figure 6 A schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0020] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In the description of the present invention, reference to an "embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the described embodiments may be combined with other embodiments.

[0022] At present, when vehicles are going down a long slope, most of them use exhaust brakes, conventional cylinder brakes, retarder brakes and other actuators for combined braking to maintain the stability of the vehicle speed during the long slope and ensure the safety of driving. However, the use of retarder braking is not only costly and increases the weight of the vehicle, but also makes the vehicle layout more complicated; the use of exhaust brakes and conventional cylinder brakes will lead to insufficient braking force, making it difficult for the vehicle to maintain speed during the long slope; in the case of a large slope, the gearbox may be frequently used for shifting.

[0023] In order to solve the above problems, the present invention provides a vehicle braking control method in a long downhill situation.

[0024] The specific embodiments are described in detail below: A specific embodiment of the present invention discloses a vehicle braking control method in a long downhill situation, combining Figure 1 Come and see, Figure 1 The flowchart of an embodiment of a vehicle braking control method under a long downhill slope provided by the present invention includes steps S101 to S103, wherein: In step S101, when the vehicle is on a long downhill section, the braking intensity currently required by the vehicle is determined based on the current vehicle speed, road slope and vehicle mass; In step S102, based on the braking intensity currently required by the vehicle, a braking mode of the vehicle is determined, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; In step S103, the braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0025] During implementation, when it is determined that the vehicle is on a long downhill section, the auxiliary braking force currently required by the vehicle can be determined first based on the current vehicle speed, road slope and vehicle mass, and then the braking intensity currently required by the vehicle can be determined based on the auxiliary braking force currently required by the vehicle.

[0026] The vehicle's braking mode can then be further determined based on the braking intensity currently required by the vehicle, that is, the braking power generated by the number of brake cylinders of the vehicle can be determined.

[0027] After determining the braking mode of the vehicle, it is possible to determine whether the current braking mode can meet the braking demand based on the vehicle speed maintenance and intake temperature changes, and then adjust the braking mode.

[0028] The vehicle braking control method under long downhill conditions provided by the present invention can be applied to braking scenarios of medium and large vehicles going down long slopes, and can also be applied to braking scenarios of ordinary vehicles going down long slopes, and the present invention does not make specific limitations on this.

[0029] Compared with the prior art, the vehicle braking control method in the long downhill situation provided by the present embodiment first determines the auxiliary braking force currently required by the vehicle through the operating parameters of the vehicle on the long downhill section, and then determines the braking intensity currently required by the vehicle according to the auxiliary braking force currently required by the vehicle, and clarifies the current braking demand of the vehicle. Then, the corresponding number of brake cylinders and braking power are determined according to the current braking demand of the vehicle. Finally, it is determined whether the current braking mode can meet the braking demand through the vehicle speed maintenance and intake air temperature change. By adjusting the braking mode, the braking mode is matched with the braking demand to avoid waste of resources. The present invention can achieve stable speed control of the vehicle on a long downhill without setting a retarder, and reduces the cost of the whole vehicle while ensuring a certain braking power.

[0030] Exemplarily, the determining of the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass includes: Determine the auxiliary braking force currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass; When the auxiliary braking force currently required by the vehicle is greater than a preset threshold, determining that the braking intensity currently required by the vehicle is the first level; When the auxiliary braking force currently required by the vehicle is less than or equal to a preset threshold, it is determined that the braking intensity currently required by the vehicle is the second level.

[0031] Specifically, when determining the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass, the auxiliary braking force currently required by the vehicle can be determined based on the current vehicle speed, road slope and vehicle mass. The calculation method can be based on the method of calculating the braking force based on the above parameters in the prior art, which will not be repeated here.

[0032] After determining the auxiliary braking force currently required by the vehicle, a preliminary judgment can be made on the current braking demand of the vehicle through a preset threshold. If the auxiliary braking force currently required by the vehicle is greater than the preset threshold, the braking intensity currently required by the vehicle can be determined to be the first level; if the auxiliary braking force currently required by the vehicle is less than or equal to the preset threshold, the braking intensity currently required by the vehicle can be determined to be the second level. By grading the braking intensity currently required by the vehicle, the current braking demand of the vehicle can be preliminarily determined, reducing the number of adjustments to the braking mode.

[0033] Exemplarily, determining the braking mode of the vehicle based on the braking intensity currently required by the vehicle includes: When the braking intensity currently required by the vehicle is the first level, determining that the number of brake cylinders of the vehicle is the first number, and the braking power is the first power; When the braking intensity currently required by the vehicle is the second level, determining that the number of brake cylinders of the vehicle is the second number, and the braking power is the second power; The first quantity is twice the second quantity, and the first power is greater than the second power.

[0034] Specifically, when it is determined that the braking intensity currently required is the first level, the number of brake cylinders of the vehicle can be determined to be the first number, and the braking power can be the first power, wherein the first power can be higher than the conventional braking power, for example, it can be achieved by generating multiple braking powers in a four-stroke braking cycle. When it is determined that the braking intensity currently required by the vehicle is the second level, the number of brake cylinders of the vehicle can be determined to be the second number, and the braking power can be the first power, and the first number can be twice the second number. For example, the first number can be 6, and the second number can be 3. By setting the braking power to the first power higher than the conventional braking power, and setting different numbers of brake cylinders according to the braking intensity currently required, different braking intensity requirements can be met while ensuring the braking power.

[0035] Exemplarily, the adjusting the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When it is determined that the number of brake cylinders of the vehicle is the second number and the brake power is the second power, if the vehicle speed is less than the first speed threshold, adjusting the brake power to a third power, wherein the third power is less than the second power; If the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, adjusting the braking mode based on the change in the intake air temperature of the vehicle; If the vehicle speed is greater than a second speed threshold, the number of brake cylinders of the vehicle is adjusted to a first number, the braking power is adjusted to a first power, and the braking mode is adjusted based on the vehicle speed maintenance and intake air temperature changes.

[0036] Specifically, when the braking mode is adjusted according to the situation and the change in intake air temperature, when it is determined that the number of brake cylinders of the vehicle is the second number and the braking power is the second power, if the vehicle speed is less than the first speed threshold, it indicates that the current braking power is excessive, and the braking power can be adjusted to a third power, which is less than the second power. For example, it can be a conventional braking power.

[0037] If the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, it indicates that the current vehicle speed can be maintained and the braking mode needs to be further adjusted according to changes in the vehicle's intake air temperature.

[0038] If the vehicle speed is greater than the second speed threshold, it means that the current braking power is too low. The number of brake cylinders of the vehicle can be adjusted to the first number, and the braking power can be adjusted to the first power. Then, the braking mode can be further adjusted according to the vehicle speed maintenance and the intake temperature change.

[0039] Exemplarily, the adjusting the braking mode based on the change in intake air temperature of the vehicle includes: When the intake air temperature of the vehicle is less than or equal to the first temperature threshold, or when the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is less than or equal to the first preset time, the number of brake cylinders of the vehicle is maintained at a second number, and the brake power remains unchanged at a second power; When the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is greater than the first preset time length, the braking power is adjusted to the third power and the engine cooling fan is turned on.

[0040] Specifically, when it is determined that the number of brake cylinders of the vehicle is the second number, and the braking power is the second power, and the vehicle speed is greater than or equal to the first speed threshold, and less than or equal to the second speed threshold, if the vehicle's intake temperature is less than or equal to the first temperature threshold, or the vehicle's intake temperature is greater than the first temperature threshold and the maintenance time is less than or equal to the first preset time length, it means that the current braking mode can meet the braking requirements and the current braking mode remains unchanged; if the vehicle's intake temperature is greater than the first temperature threshold and the maintenance time is greater than the first preset time length, it means that the intake temperature is too high. In order to lower the vehicle's intake temperature, the braking power can be adjusted to the third power, and the engine cooling fan can be turned on to assist braking and lower the intake temperature.

[0041] Exemplarily, the adjusting the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When it is determined that the number of brake cylinders of the vehicle is the first number and the brake power is the first power, if the vehicle speed is less than the first speed threshold, the brake power is adjusted to a fourth power, and the magnitude relationship among the first power, the second power, the third power and the fourth power is: the first power> the fourth power> the second power> the third power; If the vehicle speed is greater than or equal to the first speed threshold, the braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0042] Specifically, when the braking mode is adjusted according to the situation and the change of the intake temperature, when it is determined that the number of brake cylinders of the vehicle is the first number and the braking power is the first power, if the vehicle speed is less than the first speed threshold, it indicates that the current braking power is excessive, and the braking power can be adjusted to the fourth power. The relationship between the first power, the second power, the third power and the fourth power is: the first power> the fourth power> the second power> the third power; if the vehicle speed is greater than or equal to the first speed threshold, the braking mode needs to be further adjusted according to the vehicle speed maintenance situation and the change of the intake temperature.

[0043] Exemplarily, the adjusting the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When the vehicle speed is greater than a second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to a second preset time, turning on the engine cooling fan; If the vehicle's intake air temperature is greater than the second temperature threshold and the holding time is greater than the second preset time, adjusting the braking power to a fourth power and turning on the engine cooling fan; When the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to the second preset time, the number of brake cylinders of the vehicle is maintained at the first number, and the brake power remains unchanged at the first power; If the intake air temperature of the vehicle is greater than the second temperature threshold and is maintained for a time greater than a second preset time length, the braking power is adjusted to a fourth power and the engine cooling fan is turned on.

[0044] Specifically, when it is determined that the number of brake cylinders of the vehicle is a first number and the braking power is a first power, if the vehicle speed is greater than a second speed threshold and the vehicle intake temperature is less than or equal to a second temperature threshold, or the vehicle intake temperature is greater than the second temperature threshold and the maintenance time is less than or equal to a second preset time length, it means that the current braking power cannot meet the braking requirements, and the engine cooling fan can be turned on for auxiliary braking.

[0045] When it is determined that the number of brake cylinders of the vehicle is the first number and the braking power is the first power, if the vehicle speed is greater than the second speed threshold, and the vehicle intake temperature is greater than the second temperature threshold and the maintenance time is greater than the second preset time length, it means that the intake temperature is too high. In order to lower the vehicle's intake temperature, the braking power can be adjusted to the fourth power, and the brake engine cooling fan can be turned on to assist braking and lower the intake temperature.

[0046] When it is determined that the number of brake cylinders of the vehicle is the first number and the braking power is the first power, if the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, and the vehicle intake temperature is less than or equal to the second temperature threshold, or the vehicle intake temperature is greater than the second temperature threshold and the maintenance time is less than or equal to the second preset time length, it means that the current braking mode can meet the current braking demand and the current braking mode can be kept unchanged.

[0047] When it is determined that the number of brake cylinders of the vehicle is the first number and the braking power is the first power, if the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, and the vehicle intake temperature is greater than the second temperature threshold and the maintenance time is greater than the second preset time length, it means that the intake temperature is too high. In order to lower the vehicle's intake temperature, the braking power can be adjusted to the fourth power, and the engine cooling fan can be turned on to assist braking and lower the intake temperature.

[0048] Exemplarily, the method further includes: After the braking power is adjusted to the fourth power, if the vehicle speed is less than the first speed threshold, the number of brake cylinders of the vehicle is adjusted to the second number, and the braking power is adjusted to the second power.

[0049] Specifically, when it is determined that the number of brake cylinders of the vehicle is the first number and the braking power is the first power, after the vehicle speed is less than the first speed threshold and the braking power is adjusted to the fourth power, if the vehicle speed is still less than the first speed threshold, the number of brake cylinders of the vehicle can be adjusted to the second number and the braking power can be adjusted to the second power.

[0050] Exemplarily, the method further includes: After the brake engine cooling fan is turned on, if the vehicle speed is greater than the second speed threshold, the current braking mode is maintained unchanged and a transmission downshift prompt is issued.

[0051] Specifically, in the above steps, after the engine cooling fan is turned on, if the vehicle speed is still greater than the second speed threshold, it indicates that it is difficult to meet the braking demand by adjusting the braking mode. At this time, a transmission downshift prompt can be issued to the driver to increase the braking power by downshifting.

[0052] The technical solution of the present invention is better explained below in conjunction with specific embodiments: Combination Figure 2 Come and see, Figure 2 This is a flow chart of an embodiment of the overall vehicle braking control process under long downhill conditions provided by the present invention. When the driver determines that the vehicle is going down a long slope, the driver actively turns the auxiliary brake handle to the constant speed gear, and the high-power braking system receives the auxiliary braking constant speed control signal and other signal inputs (other signals include current vehicle speed, slope, load, gear position of the gearbox, etc.), and after comprehensive judgment, calculates the braking force required for high-power braking, thereby maintaining constant vehicle speed control. When the slope is large, the braking power is insufficient, and the vehicle speed cannot maintain a stable state, the fan intervenes within a controllable noise range, or the high-power braking system will feedback the signal to the driver at this time, and the gearbox will downshift to increase the braking power.

[0053] Combination Figure 3 Come and see, Figure 3 The present invention provides a schematic structural diagram of an embodiment of a vehicle braking control system under long downhill conditions, the system comprising: Electronic control unit (ECU). A-High power braking 1-3 cylinder control; B-Conventional braking 1-3 cylinder control; a-Solenoid valve 1, b-Solenoid valve 2, a and b solenoid valves are used to control high power braking of 1-3 cylinder engines and conventional braking of 1-3 cylinders. F is a software switching switch used to switch between high power braking and conventional braking of 1-3 cylinders. C-High power braking 4-6 cylinder control; D-Conventional braking 4-6 cylinder control. c-Solenoid valve 3, d-Solenoid valve 4, c and d solenoid valves are used to control high power braking of 4-6 cylinder engines and conventional braking of 4-6 cylinders. G is a software switching switch used to switch between high power braking of 4-6 cylinders and conventional braking of 4-6 cylinders.

[0054] Conventional 1-3 cylinder brakes, 4-6 cylinder brakes, and high-power 1-3 cylinder brakes, 4-6 cylinder brakes can be switched to ensure uniform wear between cylinders. 1-6 refers to the 1-6 cylinders of the engine.

[0055] Compared with the conventional engine braking system, the engine high-power braking system can generate braking power twice in a four-stroke braking cycle, while the conventional engine braking system can only generate braking power once, which greatly improves the engine braking power. From the perspective of the whole vehicle, the auxiliary braking system uses a high-power braking control system, cancels the vehicle retarder, reduces the cost and weight of the whole vehicle, saves the layout space of the whole vehicle, and can meet the required braking power. From the control point of view, the high-power braking system has a total of four braking levels, conventional three-cylinder braking (corresponding to the third power), conventional six-cylinder braking (corresponding to the fourth power), high-power braking three-cylinder braking (corresponding to the second power), and high-power braking six-cylinder braking (corresponding to the first power), and the high-power braking system can flexibly switch between the four braking levels according to the braking force requirements of the whole vehicle going down a long slope to meet the control of going down a long slope. If the high-power braking power is too high during braking down a long slope, it will switch to conventional engine braking to reduce the engine braking power and maintain the vehicle down the long slope; if the intake temperature of the high-power braking system is high or the solenoid valve fails during braking down a long slope, it can switch to conventional engine braking, and the fan can intervene within a controllable noise range, or it can remind the driver that the transmission needs to downshift to increase braking force to maintain the vehicle down the long slope.

[0056] Combination Figure 4 Come and see, Figure 4 This is a flow chart of an embodiment of a vehicle braking control process under a long downhill slope provided by the present invention. The specific process is as follows: 1. The driver finds a downhill section ahead and turns on the auxiliary braking constant speed gear.

[0057] 2. The auxiliary brake constant speed gear signal is transmitted to the ECU through the auxiliary brake handle.

[0058] 3. The ECU receives the auxiliary brake handle signal and calculates the required negative torque of the engine based on the vehicle speed, slope, vehicle mass and other information fed back by the vehicle, and arbitrates with other torques of the vehicle to calculate the auxiliary braking force.

[0059] 4. The ECU calculates the high-power braking level based on the auxiliary braking force. The braking intensity is divided into two levels: low and high. The high-power braking of the three-cylinder and six-cylinder engines is activated according to the braking intensity.

[0060] 5. Taking the high-power three-cylinder brake as an example, the ECU determines whether the vehicle speed v is within the range of m-a1≤v≤m+a1, where m is the reference speed and a is the speed error (for example, it can be set to 5km / h). If the vehicle speed is within this range, it is further determined whether the intake temperature exceeds a certain threshold value T1 and the duration is t1. If it does not exceed this threshold or exceeds the threshold value but does not exceed a certain time, the high-power three-cylinder brake is maintained to maintain the control of the long slope. If it exceeds this threshold and time, it is switched to the conventional three-cylinder brake, and the fan intervenes to provide negative torque to increase the braking power, where the fan provides negative torque according to the engine speed and intake volume. It is necessary to determine again whether the vehicle speed can be maintained stable in this range. If the vehicle speed is in this range, the control of the long slope is maintained. If it is not in this range, the conventional three-cylinder brake is maintained, and the driver is reminded to downshift, increase the braking power, and maintain the control of the long slope.

[0061] 6. If the vehicle speed is not within the range of m-a1≤v≤m+a1, it means that the vehicle speed cannot be maintained and the high-power six-cylinder brake is turned on. After turning on the high-power six-cylinder brake, the ECU will judge again whether the vehicle speed is lower than m-a1, higher than m+a1, or whether it can maintain stable vehicle speed control.

[0062] 6a. If it is lower than m-a1, it means that too much braking force is provided and the braking intensity is relatively large. Go to step 7.

[0063] 6b. If it is higher than m+a1, it means that too little braking force is provided and the braking strength is insufficient. Go to step 8.

[0064] 6c. If it is within the range, then further determine whether the intake air temperature exceeds a certain threshold value T2 after the high-power six-cylinder brake is turned on, and exceeds a period of time t2, and execute step 9.

[0065] 7. If it is lower than m-a1, switch to conventional six-cylinder braking to keep the vehicle speed stable and maintain vehicle control when going down a long slope.

[0066] 8. If it is higher than m+a1, it is further determined whether the intake air temperature exceeds a certain threshold value T2 and exceeds a certain period of time t2. If it is higher than a certain threshold value T2 and exceeds a certain period of time t2, it is switched to conventional six-cylinder braking, and the fan intervenes to increase the braking power, and it is determined again whether the vehicle speed can be stable. If it can be stable, the vehicle is kept under control when going down a long slope. If not, the conventional six-cylinder braking is maintained, and the driver is reminded to downshift, increase the braking power, and maintain a stable vehicle speed. If it does not exceed a certain threshold value T2 or exceeds T2 but does not exceed a certain period of time t2, it indicates that the vehicle speed cannot be maintained even if the high-power braking six-cylinder is turned on at this time, and it is necessary to maintain the high-power braking six-cylinder braking, and the fan needs to intervene to increase the braking power, and it is determined again whether the vehicle speed is stable. If it is stable, the vehicle is kept under control when going down a long slope. If not, the high-power six-cylinder braking is maintained at this time, and the driver is reminded to downshift, increase the braking power, and maintain a stable vehicle speed.

[0067] 9. If the speed is within this range, it is considered reasonable to start high-power six-cylinder braking at this time, and the braking intensity is sufficient. When starting high-power braking, it is necessary to determine whether the intake temperature exceeds a certain threshold and lasts for a certain period of time. If it exceeds a certain threshold T2 and lasts for a certain period of time t2, it will switch to conventional six-cylinder braking, and the fan will intervene to increase the braking power. It is determined again whether the vehicle speed can be stable. If it can be stable, the vehicle will be controlled down the long slope. If not, the conventional six-cylinder braking will be maintained, and the driver will be reminded to downshift, increase the braking power, and maintain the vehicle speed. Otherwise, the high-power six-cylinder braking will be maintained to maintain the stability of the vehicle speed.

[0068] 10. When the vehicle is going down a long slope, the downhill control is maintained. At the same time, according to the change of the downhill speed, if the speed exceeds a certain range, the required auxiliary braking force is calculated again according to the change of the speed to maintain the stability of the speed, thus forming a closed-loop speed stability control.

[0069] The present invention does not use the vehicle retarder as a source of auxiliary braking force, but adopts a high-power braking system and a gearbox downshift to jointly complete the vehicle's control down a long slope. The auxiliary braking control function is more integrated, the response is faster, and the vehicle cost is low.

[0070] The braking control method provided by the present invention includes switching and intervention of five kinds of auxiliary braking forces, namely conventional three-cylinder braking, conventional six-cylinder braking, high-power braking three-cylinder braking, high-power braking six-cylinder braking, and fan intervention. The braking power adjustment range is wide, which can meet more long slope conditions, reduce the number of gearbox shifting times when the auxiliary braking force is insufficient, and improve braking safety and driving comfort.

[0071] The embodiment of the present invention also provides a vehicle braking control device in a long downhill situation, Figure 5 Come and see, Figure 5The structure diagram of an embodiment of a vehicle braking control device for a long downhill slope provided by the present invention is as follows. The vehicle braking control device 500 for a long downhill slope comprises: The first determination module 501 is used to determine the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass when the vehicle is on a long downhill section; A second determination module 502 is used to determine a braking mode of the vehicle based on the braking intensity currently required by the vehicle, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; The adjustment module 503 is used to adjust the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition.

[0072] The specific implementation methods of each module of the vehicle braking control device under long downhill conditions can refer to the description of the vehicle braking control method under long downhill conditions mentioned above, and have similar beneficial effects, which will not be repeated here.

[0073] It should be noted that the vehicle braking control device in the case of a long downhill slope can be arranged in an existing vehicle braking module or can be arranged as an independent module, and the present invention does not make any specific limitation to this.

[0074] The embodiment of the present invention further provides an electronic device, Figure 6 Come and see, Figure 6 This is a structural schematic diagram of an embodiment of an electronic device provided by the present invention. The electronic device 600 includes a processor 601, a memory 602, and a computer program stored in the memory 602 and executable on the processor 601. When the processor 601 executes the program, the vehicle braking control method in the long downhill condition as described above is implemented.

[0075] As a preferred embodiment, the electronic device 600 further includes a display 603 for displaying the vehicle braking control method in the long downhill condition executed by the processor 601 as described above.

[0076] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in the memory 602, and executed by the processor 601 to complete the present invention. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 600. For example, the computer program may be divided into the first determination module 501, the second determination module 502, and the adjustment module 503 in the above embodiment, and the specific functions of each module are as described above, and are not described one by one here.

[0077] The electronic device 600 may be a desktop computer, a notebook, a PDA or a smart phone with an adjustable camera module.

[0078] Among them, the processor 601 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 601 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0079] The memory 602 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The memory 602 is used to store programs, and the processor 601 executes the program after receiving an execution instruction. The process definition method disclosed in any of the above embodiments of the present invention can be applied to the processor 601, or implemented by the processor 601.

[0080] The display 603 may be an LCD display screen or an LED display screen, for example, a display screen on a vehicle.

[0081] Understandably, Figure 6 The structure shown is only a schematic diagram of a structure of the electronic device 600. The electronic device 600 may also include Figure 6 More or fewer components as shown. Figure 6 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0082] The electronic device provided according to the above embodiment of the present invention can be implemented with reference to the specific description of the vehicle braking control method under the long downhill condition as described above according to the present invention, and has similar beneficial effects as the vehicle braking control method under the long downhill condition as described above, which will not be repeated here.

[0083] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the vehicle braking control method in the long downhill condition as described above is implemented.

[0084] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable media except for the signal itself that is temporarily propagating.

[0085] Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0086] Computer program codes for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages, in particular, Python suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. may be used. The program code may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0087] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0088] The present invention discloses a vehicle braking control method and device in a long downhill situation. Firstly, the auxiliary braking force currently required by the vehicle is determined through the operating parameters of the vehicle in the long downhill section, and then the braking intensity currently required by the vehicle is determined according to the auxiliary braking force currently required by the vehicle, and the current braking demand of the vehicle is clarified. Then, the corresponding number of brake cylinders and braking power are determined according to the current braking demand of the vehicle. Finally, it is determined whether the current braking mode can meet the braking demand through the vehicle speed maintenance situation and the intake air temperature change situation. By adjusting the braking mode, the braking mode is matched with the braking demand to avoid resource waste. The present invention can realize the vehicle speed stability control in a long downhill situation without setting a retarder, and reduces the cost of the whole vehicle while ensuring a certain braking power.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A vehicle braking control method in a long downhill situation, characterized in that: include: When the vehicle is on a long downhill section, the braking intensity currently required by the vehicle is determined based on the current vehicle speed, road slope and vehicle mass; Determining a braking mode of the vehicle based on the braking intensity currently required by the vehicle, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; The braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

2. The vehicle braking control method in a long downhill situation according to claim 1, characterized in that: The method of determining the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass includes: Determine the auxiliary braking force currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass; When the auxiliary braking force currently required by the vehicle is greater than a preset threshold, determining that the braking intensity currently required by the vehicle is the first level; When the auxiliary braking force currently required by the vehicle is less than or equal to a preset threshold, it is determined that the braking intensity currently required by the vehicle is the second level.

3. The vehicle braking control method in a long downhill situation according to claim 2, characterized in that: The step of determining the braking mode of the vehicle based on the braking intensity currently required by the vehicle includes: When the braking intensity currently required by the vehicle is the first level, determining that the number of brake cylinders of the vehicle is the first number, and the braking power is the first power; When the braking intensity currently required by the vehicle is the second level, determining that the number of brake cylinders of the vehicle is the second number, and the braking power is the second power; The first quantity is twice the second quantity, and the first power is greater than the second power.

4. The vehicle braking control method in a long downhill situation according to claim 3, characterized in that: The adjusting of the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When it is determined that the number of brake cylinders of the vehicle is the second number and the brake power is the second power, if the vehicle speed is less than the first speed threshold, adjusting the brake power to a third power, wherein the third power is less than the second power; If the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, adjusting the braking mode based on the change in the intake air temperature of the vehicle; If the vehicle speed is greater than a second speed threshold, the number of brake cylinders of the vehicle is adjusted to a first number, the braking power is adjusted to a first power, and the braking mode is adjusted based on the vehicle speed maintenance and intake air temperature changes.

5. The vehicle braking control method in a long downhill situation according to claim 4, characterized in that: The adjusting the braking mode based on the change of the intake air temperature of the vehicle includes: When the intake air temperature of the vehicle is less than or equal to the first temperature threshold, or when the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is less than or equal to the first preset time, the number of brake cylinders of the vehicle is maintained at a second number, and the brake power remains unchanged at a second power; When the intake air temperature of the vehicle is greater than the first temperature threshold and the holding time is greater than the first preset time length, the braking power is adjusted to the third power and the engine cooling fan is turned on.

6. The vehicle braking control method in a long downhill situation according to claim 3 or 4, characterized in that: The adjusting of the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When it is determined that the number of brake cylinders of the vehicle is the first number and the brake power is the first power, if the vehicle speed is less than the first speed threshold, the brake power is adjusted to a fourth power, and the magnitude relationship among the first power, the second power, the third power and the fourth power is: the first power> the fourth power> the second power> the third power; If the vehicle speed is greater than or equal to the first speed threshold, the braking mode is adjusted based on the vehicle speed maintenance condition and the intake air temperature change condition.

7. The vehicle braking control method in a long downhill situation according to claim 6, characterized in that: The adjusting of the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition includes: When the vehicle speed is greater than a second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to a second preset time, turning on the engine cooling fan; If the vehicle's intake air temperature is greater than the second temperature threshold and the holding time is greater than the second preset time, adjusting the braking power to a fourth power and turning on the engine cooling fan; When the vehicle speed is greater than or equal to the first speed threshold and less than or equal to the second speed threshold, if the vehicle intake temperature is less than or equal to the second temperature threshold, or if the vehicle intake temperature is greater than the second temperature threshold and the holding time is less than or equal to the second preset time, the number of brake cylinders of the vehicle is maintained at the first number, and the brake power remains unchanged at the first power; If the intake air temperature of the vehicle is greater than the second temperature threshold and is maintained for a time greater than a second preset time length, the braking power is adjusted to a fourth power and the engine cooling fan is turned on.

8. The vehicle braking control method in a long downhill situation according to claim 6, characterized in that: The method further comprises: After the braking power is adjusted to the fourth power, if the vehicle speed is less than the first speed threshold, the number of brake cylinders of the vehicle is adjusted to the second number, and the braking power is adjusted to the second power.

9. The vehicle braking control method in a long downhill situation according to claim 5 or 7, characterized in that: The method further comprises: After the engine cooling fan is turned on, if the vehicle speed is greater than the second speed threshold, the current braking mode is maintained unchanged and a transmission downshift prompt is issued.

10. A vehicle braking control device for a long downhill slope, characterized in that: include: The first determination module is used to determine the braking intensity currently required by the vehicle based on the current vehicle speed, road slope and vehicle mass when the vehicle is on a long downhill section; A second determination module is used to determine a braking mode of the vehicle based on the braking intensity currently required by the vehicle, wherein the braking mode is determined by the braking power generated by the number of brake cylinders; The adjustment module is used to adjust the braking mode based on the vehicle speed maintenance condition and the intake air temperature change condition.

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