A torque calculation method, device and equipment for a commercial vehicle retarder, and an automobile

Abstract

The application belongs to the technical field of automobile braking, and specifically provides a retarder torque calculation method, device, equipment and automobile for commercial vehicles, which comprises the following steps: judging whether the current operation mode of the vehicle meets the retarder braking enabling condition; detecting the retarder handle dialing information when the retarder braking enabling condition is met; obtaining the retarder gear state information; obtaining the corresponding retarder braking torque ratio based on the retarder gear state information; and calculating the retarder braking torque value according to the obtained retarder braking torque ratio. The torque calculation of different gears is fully considered, and multiple calculation modes are designed to better meet the braking demand. The wear of the wheel brake is reduced, and the economy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of automobile braking technology, in particular to a retarder torque calculation method, device, equipment and automobile for commercial vehicles. BACKGROUND

[0002] With the improvement of economy and road conditions, trucks show obvious heavy-duty and high-speed, and higher requirements for the safety performance of vehicles. For vehicles mainly running in mountainous areas, long downhill roads often need to be braked by service brakes, which means that the service brakes need to generate more heat and withstand more heat load. Although the service brake technology is constantly innovating, due to space arrangement, heat dissipation capacity and other reasons, under the condition of frequent braking or continuous braking of the vehicle, high temperature accumulation may occur, causing overheating recession phenomenon, and users often use water spraying on the service brake to improve braking efficiency, but this method also has a large safety hazard

[0003] As an auxiliary braking system in the vehicle braking system, the retarder is mostly used in high-end vehicles in recent years. At present, almost all large and medium-sized buses above the next level are equipped with or selected with retarders, and some trucks are also trying to install retarders. The retarder can bear most of the braking torque of the vehicle, thereby prolonging the service life of the wheel brake, reducing the maintenance cost of the vehicle braking system, and improving the economic benefit.

[0004] The existing calculation of retarder braking torque does not fully consider the torque calculation of different gears, cannot meet the braking demand, and may increase the wear of the wheel brake. Therefore, it is necessary to provide a retarder torque calculation method, device, equipment and medium for commercial vehicles to solve the above problems in the prior art. SUMMARY

[0005] The existing calculation of retarder braking torque does not fully consider the torque calculation of different gears, cannot meet the braking demand, and may increase the wear of the wheel brake. The present application provides a retarder torque calculation method, device, equipment and automobile for commercial vehicles.

[0006] In a first aspect, the present application provides a retarder torque calculation method for commercial vehicles, comprising the following steps:

[0007] determining whether the current running mode of the vehicle meets the retarder braking enabling condition;

[0008] when the retarder braking enabling condition is met, detecting the retarder handle dialing information;

[0009] obtaining retarder gear state information;

[0010] obtaining the corresponding retarder braking torque ratio based on the retarder gear state information;

[0011] According to the obtained retarder brake torque ratio, the retarder brake torque value is calculated.

[0012] As a further limitation of the technical solution of the application, the step of judging whether the current running mode of the vehicle meets the retarder brake enabling condition comprises:

[0013] Obtain throttle state information;

[0014] Judge whether the throttle opening is 0;

[0015] If not, end.

[0016] If yes, detect the retarder gear switch gear;

[0017] When the retarder gear is not off, the retarder brake enabling condition is met.

[0018] As a further limitation of the technical solution of the application, the step of obtaining the corresponding retarder brake torque ratio based on the retarder gear state information comprises:

[0019] Obtain the speed of the gearbox output shaft;

[0020] Based on the speed of the gearbox output shaft, find the MAP table corresponding to the retarder gear state to obtain the retarder brake torque ratio.

[0021] As a further limitation of the technical solution of the application, the step of calculating the retarder brake torque value according to the obtained retarder brake torque ratio comprises:

[0022] When the retarder handle gear is in gear 2 or 3, the retarder brake torque calculation formula is:

[0023] Reference torque * brake torque ratio * vehicle transmission ratio - torque transmission loss - friction torque loss;

[0024] When the retarder handle gear is in gear 4 or 5, the retarder brake torque calculation formula is:

[0025] Brake reference torque * brake torque ratio * vehicle transmission ratio + torque transmission loss + friction torque loss + exhaust brake reference torque value * exhaust brake torque ratio.

[0026] Secondly, the technical solution of the application provides a retarder torque calculation device for commercial vehicles, comprising a judgment module, a detection module, a gear state information acquisition module, a brake torque ratio acquisition module, and a brake torque calculation module.

[0027] The judgment module is used to judge whether the current running mode of the vehicle meets the retarder brake enabling condition;

[0028] The detection module is used to detect the retarder handle dial information when the retarder brake enabling condition is met;

[0029] Gear state information acquisition module, for obtaining the retarder gear state information;

[0030] Brake torque ratio acquisition module, based on the retarder gear state information to obtain the corresponding retarder brake torque ratio;

[0031] Brake torque calculation module, for calculating the retarder brake torque value according to the obtained retarder brake torque ratio.

[0032] As a further limitation of the technical scheme of the application, the judging module includes an accelerator information acquisition unit, an opening degree judging unit, a gear switch detection unit, and a condition judging unit;

[0033] Accelerator information acquisition unit, for obtaining the accelerator state information;

[0034] Opening degree judging unit, for judging whether the accelerator opening degree is 0;

[0035] Gear switch detection unit, if the accelerator opening degree is 0, detecting the retarder gear switch gear;

[0036] Condition judging unit, when the retarder gear is not off gear, the retarder brake enabling condition is met.

[0037] As a further limitation of the technical scheme of the application, the brake torque ratio acquisition module includes a first acquisition unit and a second acquisition unit;

[0038] First acquisition unit, for obtaining the transmission output shaft speed;

[0039] Second acquisition unit, for looking up the MAP table corresponding to the retarder gear state based on the transmission output shaft speed, and obtaining the retarder brake torque ratio.

[0040] As a further limitation of the technical scheme of the application, the brake torque calculation module is specifically used for, when the retarder handle gear is 2 or 3 gear, according to the retarder brake torque calculation formula: reference torque * brake torque ratio * whole vehicle transmission ratio - torque transmission loss - friction torque loss;When the retarder handle gear is 4 or 5 gear, the retarder brake torque calculation formula: brake reference torque * brake torque ratio * whole vehicle transmission ratio + torque transmission loss + friction torque loss + exhaust brake reference torque value * exhaust brake torque ratio.

[0041] In a third aspect, the technical scheme of the application further provides an electronic device, which comprises:

[0042] At least one processor;And,

[0043] The memory connected in communication with the at least one processor;Wherein,

[0044] The memory stores computer program instructions executable by the at least one processor, which are executed by the at least one processor to enable the at least one processor to perform the method for calculating the retarder torque of a commercial vehicle according to the first aspect.

[0045] In a fourth aspect, the present application also provides an automobile, comprising a vehicle controller, a retarder,

[0046] The retarder handle is connected to the vehicle controller through a hard wire.

[0047] The throttle opening, the transmission output shaft speed and the retarder fault signal are sent to the vehicle controller through a message.

[0048] When the driver adjusts the retarder handle, the retarder enters a working state, and the vehicle controller executes the method according to the first aspect to find the corresponding brake torque ratio according to different retarder handle gears and calculate the brake torque of the current retarder gear.

[0049] The vehicle controller is connected to the retarder controller through a gateway, and the finally calculated brake torque of the retarder gear is sent to the retarder controller through a message.

[0050] As can be seen from the above technical solutions, the present application has the following advantages: the current state of the vehicle is fully considered, including the throttle state, the retarder gear state, the engine speed, the transmission output shaft speed and other signals, which reduces the wear of the wheel brake and improves the economy. And the torque calculation mode of different gears is fully considered, which better meets the driving demand. Among them, the retarder gear handle is connected to the vehicle controller through a hard wire, and the throttle opening, the transmission output shaft speed, the retarder fault and other signals are sent to the vehicle controller through a message. When the driver adjusts the retarder gear handle, the retarder enters a working state, the corresponding brake torque ratio is found according to different gears, and the brake torque of the current retarder gear is calculated. When the driver adjusts the retarder handle to four gears or five gears, the exhaust brake torque value is also accumulated when calculating the brake torque according to the brake torque ratio, so as to increase the braking efficiency. And the finally calculated required brake torque is sent to the retarder controller through a message. The torque calculation of different gears is fully considered, and a multi-gear multi-calculation mode is designed, which better meets the braking demand. The wear of the wheel brake is reduced, and the economy is improved.

[0051] In addition, the design principle of the present application is reliable, the structure is simple, and it has very wide application prospect.

[0052] Therefore, compared with the prior art, the present application has outstanding substantial characteristics and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF DRAWINGS

[0053] In order to make the technical solutions in the present application or prior art clearer, the accompanying drawings needed in the description of the embodiments or prior art will be briefly introduced. Obviously, those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0054] Figure 1 is a schematic flow chart of the method of one embodiment of the present application.

[0055] Figure 2 is a schematic block diagram of the device of one embodiment of the present application.

[0056] Figure 3 is a system block diagram of an automobile provided by one embodiment of the present application. DETAILED DESCRIPTION

[0057] In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should fall into the protection scope of the present application.

[0058] As shown in Figure 1 , the technical solutions of the present application provide a torque calculation method for a retarder of a commercial vehicle, comprising the following steps:

[0059] Step 1: judging whether the current running mode of the vehicle meets the retarder braking enabling condition;

[0060] Step 2: detecting the retarder handle dialing information when the retarder braking enabling condition is met;

[0061] Step 3: obtaining the retarder gear state information;

[0062] Step 4: obtaining the corresponding retarder braking torque ratio based on the retarder gear state information;

[0063] Step 5: calculating the retarder braking torque value according to the obtained retarder braking torque ratio.

[0064] It should be noted that the step of judging whether the current running mode of the vehicle meets the retarder braking enabling condition comprises:

[0065] obtaining the throttle state information;

[0066] judging whether the throttle opening is 0;

[0067] If not, end.

[0068] If yes, detect the retarder gear switch gear;

[0069] When the retarder gear is not off gear, the retarder brake enabling condition is met.

[0070] The step of calculating the retarder brake torque value according to the obtained retarder brake torque ratio includes:

[0071] When the retarder handle gear is in gear 2 or 3, the retarder brake torque calculation formula is:

[0072] Reference torque * brake torque ratio * whole vehicle transmission ratio - torque transmission loss - friction torque loss;

[0073] When the retarder handle gear is in gear 4 or 5, the retarder brake torque calculation formula is:

[0074] Brake reference torque * brake torque ratio * whole vehicle transmission ratio + torque transmission loss + friction torque loss + exhaust brake reference torque value * exhaust brake torque ratio.

[0075] The embodiment of the application also provides a retarder torque calculation method for a commercial vehicle, including the following steps:

[0076] (1) Determine the current running mode of the vehicle, including throttle state, retarder gear state, engine speed, transmission output shaft speed and other signals. When the throttle opening is 0 and the retarder gear is not off gear, the retarder brake enabling condition is met;

[0077] (2) According to the retarder handle operated by the driver, the retarder gear state is received, and the corresponding MAP table is searched based on the transmission output shaft speed to obtain the required torque ratio of the retarder brake;

[0078] (3) And according to the retarder torque calculation formula, the required brake torque of the current retarder gear is calculated, wherein when the driver operates the retarder handle to gear 4 or 5, the exhaust brake torque value is added to the brake torque calculated according to the brake torque ratio, so as to increase the brake efficiency;

[0079] (4) The retarder torque calculation formula is:

[0080] Gear 1 is constant speed gear, the gear position is forwarded by the vehicle controller to the retarder controller, the retarder controller calculates the brake torque output by itself to maintain the current vehicle speed;

[0081] The retarder brake torque demand calculation of gear 2 and 3 is reference torque * brake torque ratio * whole vehicle transmission ratio - torque transmission loss - friction torque loss;

[0082] 4th and 5th retarder brake torque demand calculation: brake reference torque * brake torque ratio * vehicle drive ratio + torque transmission loss + friction torque loss + exhaust brake reference torque value * exhaust brake torque ratio;

[0083] wherein the gearbox output shaft speed is as the demand brake torque ratio MAP table horizontal axis, the value is [700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200]; the second gear corresponds to the demand torque ratio [-8], the third gear corresponds to the demand torque ratio [-16], the fourth gear corresponds to the demand torque ratio [-25], the fifth gear corresponds to the demand torque ratio [-33], and the exhaust brake torque ratio is [-100].

[0084] (5) When any of the following conditions is met, the retarder brake stops running:

[0085] a. The retarder gear handle is in the OFF gear, b. The throttle opening degree is not equal to 0, c. The retarder is faulty.

[0086] As shown in Figure 2 , the embodiment of the present application provides a retarder torque calculation device for commercial vehicles, comprising a judgment module, a detection module, a gear state information acquisition module, a brake torque ratio acquisition module, and a brake torque calculation module.

[0087] The judgment module is used to judge whether the current running mode of the vehicle meets the retarder brake enabling condition;

[0088] The detection module is used to detect the retarder handle turning information when the retarder brake enabling condition is met;

[0089] The gear state information acquisition module is used to acquire the retarder gear state information;

[0090] The brake torque ratio acquisition module acquires the corresponding retarder brake torque ratio based on the retarder gear state information;

[0091] The brake torque calculation module is used to calculate the retarder brake torque value according to the acquired retarder brake torque ratio.

[0092] The judgment module comprises a throttle information acquisition unit, an opening degree judgment unit, a gear switch detection unit, and a condition judgment unit.

[0093] The throttle information acquisition unit is used to acquire the throttle state information;

[0094] The opening degree judgment unit is used to judge whether the throttle opening degree is 0;

[0095] The gear switch detection unit detects the retarder gear switch gear if the throttle opening degree is 0.

[0096] The condition judging unit satisfies the retarder braking enabling condition when the retarder gear is not in the off gear.

[0097] The brake torque ratio obtaining module comprises a first obtaining unit and a second obtaining unit.

[0098] The first obtaining unit is configured to obtain the transmission output shaft speed.

[0099] The second obtaining unit is configured to look up a MAP table corresponding to the retarder gear state based on the transmission output shaft speed and obtain the retarder braking torque ratio.

[0100] The brake torque calculation module is specifically configured to, when the retarder handle gear is in the 2nd gear or the 3rd gear, calculate the retarder braking torque according to a formula: reference torque * braking torque ratio * whole vehicle transmission ratio - torque transmission loss - friction torque loss; and when the retarder handle gear is in the 4th gear or the 5th gear, calculate the retarder braking torque according to a formula: braking reference torque * braking torque ratio * whole vehicle transmission ratio + torque transmission loss + friction torque loss + exhaust braking reference torque value * exhaust braking torque ratio.

[0101] The embodiment of the present application also provides an electronic device, which comprises a processor, a communication interface, a memory and a bus, wherein the processor, the communication interface and the memory complete mutual communication through the bus. The bus can be used for information transmission between the electronic device and the sensor. The processor can call logical instructions in the memory to execute the following method: step 1, judging whether the current running mode of the vehicle satisfies the retarder braking enabling condition; step 2, detecting the retarder handle dialing information when the retarder braking enabling condition is satisfied; step 3, obtaining the retarder gear state information; step 4, obtaining the corresponding retarder braking torque ratio based on the retarder gear state information; and step 5, calculating the retarder braking torque value according to the obtained retarder braking torque ratio.

[0102] Furthermore, the logical instructions in the aforementioned memory can be implemented as software functional units and sold or used as independent products, and can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] like Figure 3 As shown, the present invention also provides an automobile, including a vehicle controller and a retarder;

[0104] The retarder handle is connected to the vehicle controller via a hardwire.

[0105] Throttle opening, gearbox output shaft speed, and retarder fault signals are sent to the vehicle controller via messages.

[0106] When the driver moves the retarder lever, the retarder enters the working state. The vehicle controller executes the method described in the above embodiment to find the corresponding braking torque ratio according to different retarder lever positions and calculates the braking torque of the current retarder position.

[0107] The vehicle controller is connected to the retarder controller via a gateway, and sends the final calculated retarder gear braking torque to the retarder controller via a message.

[0108] This invention fully considers the vehicle's current state, including throttle position, retarder gear position, engine speed, and transmission output shaft speed, reducing wheel brake wear and improving fuel economy. It also fully considers the torque calculation modes for different gears to better meet driving needs. The retarder lever is connected to the vehicle controller via a hardwired connection. Signals such as throttle opening, transmission output shaft speed, and retarder faults are sent to the vehicle controller via messages. When the driver moves the retarder gear lever, the retarder enters the working state, looks up the corresponding braking torque ratio according to different gears, and calculates the braking torque for the current retarder gear. When the driver moves the retarder lever to fourth or fifth gear, in addition to calculating the braking torque based on the braking torque ratio, the exhaust braking torque value is also accumulated to increase braking effectiveness. The final calculated required braking torque is then sent to the retarder controller via a message.

[0109] Although the present application has been described in detail with reference to the preferred embodiments, it should be understood that the application is not limited to those preferred embodiments. Various equivalent modifications or changes in the application can be made all of which fall within the scope of the present application. Any modifications or changes in the application should be construed as falling within the scope of the present application. The scope of the application should be determined by the appended claims.

Claims

1. A method for calculating the torque of a retarder for commercial vehicles, characterized in that, Includes the following steps: Determine whether the vehicle's current operating mode meets the conditions for retarder braking activation; When the retarder braking activation conditions are met, detect the retarder handle movement information. Obtain the retarder gear status information; The corresponding retarder braking torque ratio is obtained based on the retarder gear status information. Calculate the retarder braking torque value based on the obtained retarder braking torque ratio; The steps for calculating the retarder braking torque value based on the obtained retarder braking torque ratio include: When the retarder lever is in position 2 or 3, the formula for calculating the retarder braking torque is as follows: Reference torque Braking torque ratio Vehicle gear ratio - torque transmission loss - friction torque loss; When the retarder handle is in position 4 or 5, the formula for calculating the retarder braking torque is as follows: Braking reference torque Braking torque ratio Vehicle gear ratio + torque transmission loss + friction torque loss + exhaust braking reference torque value Exhaust braking torque ratio.

2. The method for calculating the torque of a retarder for commercial vehicles according to claim 1, characterized in that, The steps to determine whether the vehicle's current operating mode meets the conditions for retarder braking activation include: Obtain throttle status information; Determine if the throttle opening is 0; If not, end; If so, check the retarder gear switch position; When the retarder is not in the off position, the retarder braking activation conditions are met.

3. The method for calculating the torque of a retarder for commercial vehicles according to claim 2, characterized in that, The steps for obtaining the corresponding retarder braking torque ratio based on the retarder gear status information include: Obtain the output shaft speed of the gearbox; Based on the gearbox output shaft speed, the corresponding retarder gear position is looked up in the MAP table to obtain the retarder braking torque ratio.

4. A torque calculation device for a retarder in a commercial vehicle, characterized in that, It includes a judgment module, a detection module, a gear status information acquisition module, a braking torque ratio acquisition module, and a braking torque calculation module; The judgment module is used to determine whether the current operating mode of the vehicle meets the conditions for retarder braking to be activated. The detection module is used to detect the retarder handle movement information when the retarder braking activation conditions are met. The gear position status information acquisition module is used to acquire the gear position status information of the retarder; The braking torque ratio acquisition module acquires the corresponding retarder braking torque ratio based on the retarder gear status information. The braking torque calculation module is used to calculate the retarder braking torque value based on the obtained retarder braking torque ratio. The braking torque calculation module is specifically used to calculate the braking torque according to the retarder braking torque formula when the retarder handle is in position 2 or 3: Reference Torque. Braking torque ratio Vehicle gear ratio - torque transmission loss - friction torque loss; when the retarder lever is in gear 4 or 5, the formula for calculating the retarder braking torque is: Braking reference torque Braking torque ratio Vehicle gear ratio + torque transmission loss + friction torque loss + exhaust braking reference torque value Exhaust braking torque ratio.

5. The torque calculation device for a retarder in a commercial vehicle according to claim 4, characterized in that, The judgment module includes a throttle information acquisition unit, an opening degree judgment unit, a gear position switch detection unit, and a condition judgment unit; Throttle information acquisition unit, used to acquire throttle status information; The throttle opening determination unit is used to determine whether the throttle opening is 0; The gear position switch detection unit detects the retarder gear position switch if the throttle opening is 0. The condition judgment unit determines that the retarder braking activation condition is met when the retarder is not in the off position.

6. The torque calculation device for a retarder in a commercial vehicle according to claim 5, characterized in that, The braking torque ratio acquisition module includes a first acquisition unit and a second acquisition unit; The first acquisition unit is used to acquire the speed of the gearbox output shaft. The second acquisition unit is used to look up the corresponding retarder gear position status in the MAP table based on the gearbox output shaft speed, and obtain the retarder braking torque ratio.

7. An electronic device, characterized in that, The electronic device includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores computer program instructions executable by at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the torque calculation method for a retarder for commercial vehicles as described in any one of claims 1 to 3.

8. A car, characterized in that, Including vehicle controller and retarder; The retarder handle is connected to the vehicle controller via a hardwire. Throttle opening, gearbox output shaft speed, and retarder fault signals are sent to the vehicle controller via messages. When the driver moves the retarder lever, the retarder enters the working state, and the vehicle controller executes the method described in any one of claims 1-3, finds the corresponding braking torque ratio according to different retarder lever gears, and calculates the braking torque of the current retarder gear. The vehicle controller is connected to the retarder controller via a gateway, and sends the final calculated retarder gear braking torque to the retarder controller via a message.

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