Method and device for emergency stop of vehicle

Abstract

The invention provides a vehicle emergency stop method and device, and belongs to the technical field of automobile engines, and the method comprises the following steps: when gearbox hardware is blocked, receiving a blocking stop instruction, controlling a stop module to obtain vehicle blocking data based on the blocking stop instruction, obtaining an engine rapid stop instruction based on the vehicle blocking data, and sending the engine rapid stop instruction to a control module; when the communication between the gearbox and the whole vehicle is interrupted, receiving an idle speed torque limiting instruction, controlling the state monitoring module to obtain vehicle driving data based on the idle speed torque limiting instruction, matching the vehicle driving data with a preset vehicle state threshold value to obtain a current vehicle driving state, and controlling the state monitoring module to control the state monitoring module to obtain the vehicle driving state based on the current vehicle driving state and the vehicle driving data. Obtaining a corresponding torque limit value; the current vehicle running state is a sliding state or an accelerator state, the engine is controlled to be adjusted to the corresponding torque limit on the basis of the idle torque limiting instruction, and the engine is controlled to conduct shutdown operation on the basis of the gear clamping shutdown instruction.

Description

Technical Field

[0001] The invention relates to the technical field of automobile engines, and in particular to a method and a device for emergency stopping of a vehicle. Background Art

[0002] Existing commercial vehicles will only report a fault when there is a transmission communication failure or a hardware jam failure, requiring the driver to first brake and then shut down the engine and power off, or will only give a torque limit under a single condition.

[0003] The prior art has the following disadvantages: 1. When the driver cuts off the power by himself, the whole vehicle fails unexpectedly and in some special circumstances, the driver's behavioral reaction and reaction time are different. It is impossible to 100% guarantee that every driver will make the key-off action in time and correctly, and potential dangerous factors still exist. 2. If it is a single torque limit, the limited torque will be small, which will cause the vehicle to travel at a lower speed. If this fault occurs in unfavorable terrain conditions (such as railway tracks), the driver cannot significantly speed up the vehicle and cannot escape from danger. 3. When the TCU detects that the gearbox hardware is stuck (including the clutch cannot be disconnected), the power transmission between the engine and the wheels is no longer controlled and is continuously transmitted. When the load is light and the gear is low, it is not easy to stop the car. If there is an emergency stop function, the braking distance can be effectively shortened to avoid such problems of not being able to stop in time. Therefore, the existing technology cannot achieve the technical problem of ensuring the safety of the driver and stopping in time when the AMT communication and hardware fail. Summary of the invention

[0004] In view of this, it is necessary to provide a method and device for emergency stopping of a vehicle to solve the technical problem in the prior art that it is impossible to ensure the safety of the driver and timely stop the vehicle when AMT communication and hardware failure occur.

[0005] In order to solve the above technical problems, on the one hand, the present invention provides a method for emergency stopping of a vehicle, comprising: When the gearbox hardware is stuck, a stuck stop instruction is received, and based on the stuck stop instruction, a stop module is controlled to obtain vehicle stuck data, and based on the vehicle stuck data, an engine quick stop instruction is obtained; When the transmission and the vehicle are disconnected from each other, the idle torque limiting instruction is received, and based on the idle torque limiting instruction, the state monitoring module is controlled to obtain vehicle driving data, and the vehicle driving data is matched with a preset vehicle state threshold value to obtain the current vehicle driving state, and the corresponding torque limit is obtained based on the current vehicle driving state and the vehicle driving data; the current vehicle driving state is: gliding state or throttle state; Controlling the engine to adjust to a corresponding torque limit value based on the limited idle torque command; The engine is controlled to stop based on the stop command.

[0006] In a possible implementation, the vehicle driving data includes: Throttle status data, engine status data, vehicle speed and engine speed.

[0007] In a possible implementation, based on the current vehicle driving state and vehicle driving data, a corresponding torque limit value is obtained, including: In the coasting state, the maximum external torque is calculated for the vehicle driving data to obtain the maximum external indicated torque, and based on the maximum external indicated torque, the corresponding torque limit is obtained.

[0008] In one possible implementation, Under the throttle state, the vehicle driving data is subjected to quick torque arbitration to obtain the gearbox required torque, and based on the gearbox required torque, the corresponding torque limit is obtained.

[0009] In a possible implementation, obtaining a corresponding torque limit value based on the maximum external indicated torque includes: The maximum value is calculated based on the maximum external indicated torque to obtain the corresponding torque limit value.

[0010] In a possible implementation, based on the gearbox required torque, a corresponding torque limit is obtained, including: Based on the gearbox demand torque and the acquired engine resistance torque, the corresponding torque limit is obtained.

[0011] In a possible implementation, the corresponding torque limit is obtained based on the gearbox required torque and the obtained engine resistance torque, including: The gearbox required torque and the obtained engine resistance torque are calculated based on the adder to obtain the corresponding torque limit.

[0012] In a possible implementation, the gearbox required torque and the acquired engine resistance torque are calculated based on an adder to obtain a corresponding torque limit value, including: Calculating the gearbox demand torque and the acquired engine resistance torque based on the adder to obtain the adder output result; The maximum value is calculated based on the adder output result, and the corresponding torque limit value is calculated.

[0013] In a possible implementation, the vehicle blocking data includes: Vehicle speed, PTO status data, brake status data, engine speed, throttle opening data and idling stop duration data.

[0014] On the other hand, the present invention also provides a vehicle emergency stop device, comprising: The gearbox hardware blocking module is used to receive a blocking stop instruction when the gearbox hardware is stuck, and control the stop module to obtain vehicle blocking data based on the blocking stop instruction, and obtain an engine quick stop instruction based on the vehicle blocking data; The communication interruption module is used to receive the idle torque limit instruction when the communication between the transmission and the whole vehicle is interrupted, and control the state monitoring module to obtain the vehicle driving data based on the idle torque limit instruction, and match the vehicle driving data with the preset vehicle state threshold to obtain the current vehicle driving state, and obtain the corresponding torque limit value based on the current vehicle driving state and the vehicle driving data; the current vehicle driving state is: coasting state or throttle state; A torque limit module, used for controlling the engine to adjust to a corresponding torque limit based on the idle torque limit instruction; The shutdown module is used to block the shutdown command and control the engine to perform the shutdown operation.

[0015] The beneficial effects of the present invention are as follows: the vehicle emergency shutdown method provided by the present invention comprises: when the gearbox hardware is stuck, receiving a stuck shutdown instruction, and based on the stuck shutdown instruction, controlling the shutdown module to obtain vehicle stuck data, and based on the vehicle stuck data, obtaining an engine rapid shutdown instruction, the purpose of which is to consider the case where the gearbox hardware is stuck, controlling the shutdown module to obtain vehicle stuck data based on the stuck shutdown instruction, and obtaining an engine rapid shutdown instruction based on the vehicle stuck data; when the communication between the gearbox and the whole vehicle is interrupted, receiving an idle torque limiting instruction, and based on the idle torque limiting instruction, controlling the state monitoring module to obtain vehicle driving data, and matching the vehicle driving data with a preset vehicle state threshold to obtain the current vehicle driving state, and based on the current vehicle driving state and the vehicle driving data, The corresponding torque limit is obtained. The purpose of this is to consider the case where the communication between the gearbox and the whole vehicle is interrupted. Based on the idle torque limit command, the state monitoring module is controlled to obtain relevant data and the current vehicle driving state: coasting state or throttle state. Based on the current vehicle driving state and vehicle driving data, the corresponding torque limit is obtained; based on the idle torque limit command, the engine is controlled to limit the torque when the vehicle is driving, and based on the stuck stop command, the engine is controlled to stop when the vehicle brakes. The purpose of this is to consider that when the gearbox hardware is stuck and the communication between the gearbox and the whole vehicle is interrupted, the engine is controlled to limit the torque when the vehicle is driving by limiting the idle torque command, and the engine is controlled to stop when the vehicle brakes by the stuck stop command, which can ensure the driver's safety and timely parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic flow chart of an embodiment of a vehicle emergency shutdown method provided by the present invention; Figure 2 An internal architecture diagram of a TCU (Transmission Control Unit, automatic transmission control unit) communication loss in one embodiment of a vehicle emergency shutdown method provided by the present invention; Figure 3 An internal structural diagram of a transmission block in an embodiment of a vehicle emergency stop method provided by the present invention; Figure 4 The present invention is a schematic structural diagram of an embodiment of a vehicle emergency stop device provided by the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0020] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0021] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments 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 with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The present invention provides a vehicle emergency shutdown method and device, which are described below respectively.

[0024] Figure 1 A schematic diagram of an embodiment of a vehicle emergency shutdown method provided by the present invention, Figure 2 The internal architecture diagram of the TCU (Transmission Control Unit, automatic transmission control unit) communication loss of an embodiment of the vehicle emergency shutdown method provided by the present invention and Figure 3 The internal structure diagram of a gearbox jamming of an embodiment of the vehicle emergency shutdown method provided by the present invention includes: S101, when the gearbox hardware is stuck, receiving a stuck stop instruction, and controlling a stop module to obtain vehicle stuck data based on the stuck stop instruction, and obtaining an engine quick stop instruction based on the vehicle stuck data; S102, when the communication between the transmission and the vehicle is interrupted, receiving the idle torque limit instruction, and based on the idle torque limit instruction, controlling the state monitoring module to obtain vehicle driving data, and matching the vehicle driving data with a preset vehicle state threshold to obtain the current vehicle driving state, and obtaining the corresponding torque limit value based on the current vehicle driving state and the vehicle driving data; the current vehicle driving state is: coasting state or throttle state; S103, controlling the engine to adjust to a corresponding torque limit value based on the idle torque limit instruction; S104: Control the engine to perform a shutdown operation based on the stop instruction.

[0025] It can be understood that in step S101, when the TCU recognizes that the gearbox hardware is stuck and the clutch cannot be disengaged, it will send an ESR message and a PGN-Req message. After receiving the RGN-Req message, the ECU sends an EC2 feedback to the TCU to indicate that it supports the stuck emergency stop function. After receiving the ESR message, the ECU parses SPN7829 and outputs a stuck stop request. The stuck stop request is sent to the stop module together with the vehicle speed, PTO (power take-off) status, brake status, engine speed, throttle opening, and idle mode signal status. The module will output the coasting idle mode stuck stop enable. At the same time, the stuck stop request is also input into the original idle stop duration module together with the vehicle speed and brake signal. The engine idle stop request output by the module will enter the engine stop request module together with the newly added coasting idle mode stuck stop enable. Finally, the module will output the engine quick shutdown command.

[0026] The transmission jam emergency stop function can effectively shorten the braking distance, especially when the load is light and the gear is low, the car is not easy to stop. This function can avoid such problems of not being able to stop in time.

[0027] It can be further understood that in step S102, when the transmission and vehicle communication are interrupted, the engine ECU (Electronic Control Unit) cannot receive the message command sent by the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0028] It can be further understood that when the following conditions are met at the same time, it is determined that there is an intention to stop the engine due to the vehicle coasting due to the gearbox being stuck: 1. The vehicle speed is less than a certain value; 2. PTO / cruise is not activated; 3. The brake signal is valid for a period of time; 4. The engine speed is within the idle range; 5. The throttle opening is less than a certain value; 6. The idle mode is coasting idle; However, once it is detected that PTO / cruise is activated, the throttle opening is greater than a certain value, or the engine is in shutdown state, the transmission is disengaged and the vehicle coasts to shut down the engine.

[0029] It can be further understood that when the transmission is disconnected from the vehicle, the present invention achieves safe parking through the idle torque limiting function; when the TCU detects that the transmission hardware is stuck (including the clutch cannot be disconnected), the power transmission between the engine and the wheels is no longer controlled and is continuously transmitted. The emergency stop function allows the driver to continue to control the vehicle under adverse terrain conditions and effectively shortens the braking distance when parking is required. The method proposed by the present invention enables the engine to ensure the driver's safety when the AMT (Automated Mechanical Transmission) communication and hardware failures occur.

[0030] In some embodiments of the present invention, the vehicle driving data includes: Throttle status data, engine status data, vehicle speed and engine speed.

[0031] It is understandable that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0032] In some embodiments of the present invention, obtaining a corresponding torque limit value based on the current vehicle driving state and vehicle driving data includes: In the coasting state, the maximum external torque is calculated for the vehicle driving data to obtain the maximum external indicated torque, and based on the maximum external indicated torque, the corresponding torque limit is obtained.

[0033] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0034] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0035] When the idle mode is not in the non-idle state, it is determined to be in the coasting state. When any of the following conditions is not met, it is determined to exit the coasting state: 1. The idle mode is in non-idle state; 2. The vehicle speed is less than a certain value; 3. The speed is less than a certain value; After determining that it is in the coasting driving state, if it is also determined that the ETC1 message timeout exceeds 10 seconds, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting driving state after the TCU communication is lost and the output is added to the maximum external torque calculation module, and arbitrated together with the maximum flywheel indicated torque and transmission protection torque.

[0036] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0037] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0038] In some embodiments of the present invention, Under the throttle state, the vehicle driving data is subjected to quick torque arbitration to obtain the gearbox required torque, and based on the gearbox required torque, the corresponding torque limit is obtained.

[0039] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0040] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0041] In some embodiments of the present invention, obtaining a corresponding torque limit value based on the maximum external indicated torque includes: The maximum value is calculated based on the maximum external indicated torque to obtain the corresponding torque limit value.

[0042] It can be understood that the maximum value calculation is to take the maximum value of the maximum external indicated torque and the value of the transmission required torque plus the engine resistance torque.

[0043] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0044] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0045] In some embodiments of the present invention, obtaining a corresponding torque limit value based on the gearbox required torque includes: Based on the gearbox demand torque and the acquired engine resistance torque, the corresponding torque limit is obtained.

[0046] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0047] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0048] In some embodiments of the present invention, the corresponding torque limit is obtained based on the gearbox required torque and the obtained engine resistance torque, including: The gearbox required torque and the obtained engine resistance torque are calculated based on the adder to obtain the corresponding torque limit.

[0049] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0050] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0051] In some embodiments of the present invention, the gearbox required torque and the obtained engine resistance torque are calculated based on an adder to obtain a corresponding torque limit value, including: Calculating the gearbox demand torque and the acquired engine resistance torque based on the adder to obtain the adder output result; The maximum value is calculated based on the adder output result, and the corresponding torque limit value is calculated.

[0052] It can be understood that the maximum value calculation is to take the maximum value of the maximum external indicated torque and the value of the transmission required torque plus the engine resistance torque.

[0053] It is understandable that the specific operation steps are as follows: When the following conditions are met at the same time, it is judged to be in normal driving state (driving with throttle): 1. The throttle opening is greater than a certain value; 2. The engine is in running state; 3. The vehicle speed is greater than a certain value; 4. The idle mode is in non-idle state; When any of the above conditions is not met, exit the normal driving (driving with throttle) state. After judging the normal driving state, if it is also judged that the ETC1 message timeout exceeds 10 seconds, the value of SPN1845 after the TCFG2 message is parsed is assigned to the torque limit value in the driving state with throttle after TCU communication is lost and output to the fast torque arbitration, and arbitrated together with other vehicle external torque requests.

[0054] It can be further understood that when the transmission and vehicle communication is interrupted, the engine ECU cannot receive the message command from the TCU. At this time, the engine needs to limit the idle torque to the minimum level. The torque value is broadcasted by the transmission through the TCFG2 message at the beginning of power-on. The implementation logic is as follows: The throttle, engine status, vehicle speed, idle mode and engine speed are used to determine whether the vehicle is in a driving state with throttle or a coasting state. After the ETC1 message is lost for more than 10 seconds, if the vehicle is in a driving state with throttle, the value of SPN1845 after parsing the TCFG2 message is assigned to the torque limit value in the driving state with throttle after ETC1 timeout, and the value is added to the original module fast torque arbitration to participate in the torque limiting of the entire torque path; if the vehicle is in a coasting state, the value of SPN7827 after parsing the TCFG2 message is assigned to the torque limit value in the coasting state after ETC1 timeout, and the value is added to the original module maximum external torque calculation to participate in the torque limiting of the entire torque path.

[0055] In some embodiments of the present invention, the vehicle stuck data includes: Vehicle speed, PTO status data, brake status data, engine speed, throttle opening data and idling stop duration data.

[0056] It is understandable that when the TCU recognizes that the gearbox hardware is stuck and the clutch cannot be disengaged, it will send ESR messages and PGN-Req messages. After receiving the RGN-Req message, the ECU sends EC2 feedback to the TCU to indicate that it supports the stuck emergency stop function. After receiving the ESR message, the ECU parses SPN7829 and outputs a stuck stop request. The stuck stop request will be sent to the stop module together with the vehicle speed, PTO status, brake status, engine speed, throttle opening, and idle mode signal status. The module will output the coasting idle mode stuck stop enable. At the same time, the stuck stop request will be input into the original idle stop duration module together with the vehicle speed and brake signal. The engine idle stop request output by the module will enter the engine stop request module together with the newly added coasting idle mode stuck stop enable. Finally, the module will output the engine quick shutdown command.

[0057] The transmission jam emergency stop function can effectively shorten the braking distance, especially when the load is light and the gear is low, the car is not easy to stop. This function can avoid such problems of not being able to stop in time.

[0058] It can be further understood that when the following conditions are met at the same time, it is determined that there is an intention to stop the engine due to the vehicle coasting due to the gearbox being stuck: 1. The vehicle speed is less than a certain value; 2. PTO / cruise is not activated; 3. The brake signal is valid for a period of time; 4. The engine speed is within the idle range; 5. The throttle opening is less than a certain value; 6. The idle mode is coasting idle; However, once it is detected that PTO / cruise is activated, the throttle opening is greater than a certain value, or the engine is in shutdown state, the transmission is disengaged and the vehicle coasts to shut down the engine.

[0059] Figure 4 A schematic structural diagram of an embodiment of a vehicle emergency stop device provided by the present invention comprises: The gearbox hardware blocking module 401 is used to receive a blocking stop instruction when the gearbox hardware is stuck, and control the stop module to obtain vehicle blocking data based on the blocking stop instruction, and obtain an engine quick stop instruction based on the vehicle blocking data; The communication interruption module 402 is used to receive the idle torque limit instruction when the communication between the transmission and the whole vehicle is interrupted, and control the state monitoring module to obtain the vehicle driving data based on the idle torque limit instruction, and match the vehicle driving data with the preset vehicle state threshold to obtain the current vehicle driving state, and obtain the corresponding torque limit value based on the current vehicle driving state and the vehicle driving data; the current vehicle driving state is: coasting state or throttle state; The torque limit module 403 is used to control the engine to adjust to a corresponding torque limit based on the idle torque limit instruction; The shutdown module 404 is used to block the shutdown instruction and control the engine to perform a shutdown operation.

[0060] The vehicle emergency stop device 400 provided in the above embodiment can implement the technical solution described in the above vehicle emergency stop method embodiment. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above vehicle emergency stop method embodiment, which will not be repeated here.

[0061] The vehicle emergency shutdown method and device provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for emergency shutdown of a vehicle, characterized in that: include: When the gearbox hardware is stuck, a stuck stop instruction is received, and based on the stuck stop instruction, a stop module is controlled to obtain vehicle stuck data, and based on the vehicle stuck data, an engine quick stop instruction is obtained; When the communication between the transmission and the vehicle is interrupted, an idle torque limiting instruction is received, and based on the idle torque limiting instruction, a state monitoring module is controlled to obtain vehicle driving data, and the vehicle driving data is matched with a preset vehicle state threshold to obtain the current vehicle driving state, and based on the current vehicle driving state and the vehicle driving data, a corresponding torque limit is obtained; The current vehicle driving state is: coasting state or throttle state; Controlling the engine to adjust to a corresponding torque limit value based on the limited idle torque command; The engine is controlled to stop based on the stop command.

2. The method for emergency stopping of a vehicle according to claim 1, characterized in that: Vehicle driving data, including: Throttle status data, engine status data, vehicle speed and engine speed.

3. The method for emergency stopping of a vehicle according to claim 1, characterized in that: Based on the current vehicle driving state and vehicle driving data, the corresponding torque limit is obtained, including: In the coasting state, the maximum external torque is calculated for the vehicle driving data to obtain the maximum external indicated torque, and based on the maximum external indicated torque, the corresponding torque limit is obtained.

4. The method for emergency stopping of a vehicle according to claim 3, characterized in that: Under the throttle state, the vehicle driving data is subjected to quick torque arbitration to obtain the gearbox required torque, and based on the gearbox required torque, the corresponding torque limit is obtained.

5. The method for emergency stopping of a vehicle according to claim 3, characterized in that: Based on the maximum external indicated torque, the corresponding torque limit is obtained, including: The maximum value is calculated based on the maximum external indicated torque to obtain the corresponding torque limit value.

6. The method for emergency stopping of a vehicle according to claim 4, characterized in that: Based on the gearbox required torque, the corresponding torque limit is obtained, including: Based on the gearbox demand torque and the acquired engine resistance torque, the corresponding torque limit is obtained.

7. The method for emergency stopping of a vehicle according to claim 6, characterized in that: Based on the gearbox required torque and the obtained engine resistance torque, the corresponding torque limit is obtained, including: The gearbox required torque and the obtained engine resistance torque are calculated based on the adder to obtain the corresponding torque limit.

8. The method for emergency stopping of a vehicle according to claim 7, characterized in that: The adder calculates the gearbox demand torque and the obtained engine resistance torque to obtain the corresponding torque limit, including: Calculating the gearbox demand torque and the acquired engine resistance torque based on the adder to obtain the adder output result; The maximum value is calculated based on the adder output result, and the corresponding torque limit value is calculated.

9. The method for emergency stopping of a vehicle according to claim 1, characterized in that: Vehicle stuck data, including: Vehicle speed, PTO status data, brake status data, engine speed, throttle opening data and idling stop duration data.

10. A vehicle emergency stop device, characterized in that: include: The gearbox hardware blocking module is used to receive a blocking stop instruction when the gearbox hardware is stuck, and control the stop module to obtain vehicle blocking data based on the blocking stop instruction, and obtain an engine quick stop instruction based on the vehicle blocking data; The communication interruption module is used to receive the idle torque limit instruction when the communication between the transmission and the whole vehicle is interrupted, and control the state monitoring module to obtain the vehicle driving data based on the idle torque limit instruction, and match the vehicle driving data with the preset vehicle state threshold to obtain the current vehicle driving state, and obtain the corresponding torque limit value based on the current vehicle driving state and the vehicle driving data; the current vehicle driving state is: coasting state or throttle state; A torque limit module, used for controlling the engine to adjust to a corresponding torque limit based on the idle torque limit instruction; The shutdown module is used to block the shutdown command and control the engine to perform the shutdown operation.

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