Output Shaft Drive Detection Method and System

Abstract

The present application provides a method and a system for detecting the driving of an output shaft. The method includes: the vehicle controller determines the first actual torque of the transmission output shaft and the first actual torque threshold. If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state; the motor controller determines the second actual torque of the transmission output shaft and the second actual torque threshold. If it is determined that the second actual torque is greater than the second actual torque threshold, the hybrid vehicle is triggered to enter a safe state. In the present invention, the vehicle controller and the electric vehicle controller are independent of each other and redundant, both monitor the output shaft torque, and can independently enter the safe state, ensuring the safety of the output shaft torque of the hybrid vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy electric control, and particularly to an output shaft drive detection method and system. Background Art

[0002] In existing hybrid drive systems, a vehicle control unit (VCU) / transmission control unit (TCU) is usually used to obtain multiple parameters for calculating the output shaft torque, so as to calculate the output shaft speed of a hybrid vehicle based on the multiple parameters.

[0003] However, in some cases, some of the multiple parameters obtained by the VCU / TCU may be invalid parameters. In this case, it is impossible to calculate the output shaft speed of the hybrid vehicle based on the multiple parameters. Summary of the Invention

[0004] In view of this, the present invention provides an output shaft drive detection method and system, which can independently monitor the output shaft by using a vehicle control unit and a motor control unit. In the case of having the motor control unit as a redundant monitoring method, it is possible to ensure the monitoring of the output shaft torque of the hybrid vehicle as much as possible.

[0005] In order to achieve the above object, the present application provides the following technical features:

[0006] An output shaft drive detection method, comprising:

[0007] The vehicle control unit determines the first actual torque and the first actual torque threshold of the transmission output shaft. If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state;

[0008] The motor control unit determines the second actual torque and the second actual torque threshold of the transmission output shaft. If it is determined that the second actual torque is greater than the second actual torque threshold, the hybrid vehicle is triggered to enter a safe state.

[0009] Optionally, the vehicle control unit determines the first actual torque and the first actual torque threshold of the transmission output shaft, including:

[0010] The vehicle control unit obtains a first parameter set of the hybrid vehicle, where the first parameter set includes a first acceleration pedal sensor collecting a first acceleration pedal signal;

[0011] Obtain a second acceleration pedal signal collected by a second acceleration pedal sensor from the motor control unit and the actual torque estimated by the motor function layer;

[0012] Calculate the first actual torque and the first actual torque threshold based on the first parameter set, the second accelerator pedal signal, and the actual torque estimated by the motor function layer.

[0013] Optionally, the vehicle control unit obtaining the first parameter set of the hybrid vehicle includes:

[0014] The vehicle control unit collects the first accelerator pedal signal through a first accelerator pedal sensor;

[0015] The vehicle control unit collects the output shaft speed through an output shaft speed sensor;

[0016] The vehicle control unit collects the clutch position through a clutch position sensor;

[0017] The vehicle control unit collects the synchronizer position through a synchronizer position sensor;

[0018] The vehicle control unit collects the input shaft speed through an input shaft speed sensor;

[0019] The vehicle control unit receives the actual torque estimated by the engine function layer through an engine control unit.

[0020] Optionally, calculating the first actual torque and the first actual torque threshold based on the first parameter set and the second accelerator pedal signal includes:

[0021] The vehicle control unit calculates the first actual torque threshold of the output shaft through the first accelerator pedal signal, the second accelerator pedal signal, and the output shaft speed;

[0022] The vehicle control unit estimates the clutch state based on the clutch position;

[0023] The vehicle control unit estimates the gear information of the motor and the engine gear information based on the synchronizer position;

[0024] The vehicle control unit calculates the first actual torque transmitted to the wheel end of the hybrid vehicle through the clutch state, the gear information, the actual torque output by the engine function layer, and the actual torque estimated by the motor function layer.

[0025] Optionally, the motor control unit determining the second actual torque and the second actual torque threshold of the transmission output shaft includes:

[0026] The motor control unit obtains a second parameter set of the hybrid vehicle, where the second parameter set includes a second accelerator pedal sensor collecting a second accelerator pedal signal;

[0027] Obtain the first accelerator pedal signal collected by the first accelerator pedal sensor from the vehicle control unit;

[0028] Calculate the second actual torque and the second actual torque threshold based on the second parameter set and the first accelerator pedal signal.

[0029] Optionally, the motor controller obtaining the second parameter set of the hybrid vehicle includes:

[0030] The motor controller collects a second accelerator pedal signal through a second accelerator pedal sensor;

[0031] The motor controller receives a vehicle speed signal from an external system;

[0032] The motor controller collects the motor speed through a motor shaft speed sensor;

[0033] The motor controller receives the actual torque and the engine speed estimated by the engine work monitoring layer from the engine controller;

[0034] The vehicle controller collects the input shaft speed through an input shaft speed sensor.

[0035] Optionally, the calculating the second actual torque and the second actual torque threshold based on the second parameter set and the first accelerator pedal signal includes:

[0036] The motor controller calculates a second actual torque threshold through the first accelerator pedal signal, the second accelerator pedal signal, and the vehicle speed signal;

[0037] The motor controller estimates the motor gear information through the vehicle speed signal and the motor speed;

[0038] The motor controller estimates the engine gear information through the input shaft speed and the vehicle speed signal;

[0039] The motor controller determines the clutch state through the engine speed, the input shaft speed, and the actual torque estimated by the engine monitoring layer;

[0040] The motor controller calculates the second actual torque transmitted to the wheel end of the hybrid vehicle through the motor gear information, the engine gear information, the actual torque estimated by the engine monitoring layer, the clutch state, and the actual torque estimated by the motor monitoring layer.

[0041] An output shaft drive detection system includes:

[0042] A first vehicle controller connected to a first accelerator pedal sensor, configured to determine a first actual torque and a first actual torque threshold of a transmission output shaft, and if it is determined that the first actual torque is greater than the first actual torque threshold, trigger the hybrid vehicle to enter a safe state;

[0043] A motor controller connected to a second accelerator pedal sensor is configured to determine a second actual torque and a second actual torque threshold of the output shaft of the transmission. If it is determined that the second actual torque is greater than the second actual torque threshold, the hybrid vehicle is triggered to enter a safe state.

[0044] Through the above technical means, the following beneficial effects can be achieved:

[0045] The present invention can monitor the output shaft using two independent devices, namely a vehicle controller and a motor controller. In the case where the vehicle controller obtains invalid parameters, the parameters obtained by the motor controller can be used to monitor the output shaft. Similarly, in the case where the motor controller obtains invalid parameters, the parameters obtained by the vehicle controller can be used to monitor the output shaft.

[0046] The vehicle controller and the electric vehicle controller are independent and redundant, both monitoring the output shaft torque and capable of independently entering a safe state to ensure the safety of the output shaft torque of the hybrid vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 FIG. 1 is a schematic structural diagram of an output shaft drive detection system disclosed in an embodiment of the present invention;

[0049] Figure 2 FIG. 2 is a schematic diagram of an output shaft drive detection method disclosed in an embodiment of the present invention;

[0050] Figure 3 FIG. 3 is a schematic diagram of another output shaft drive detection method disclosed in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0052] This application provides an output shaft torque detection system, see Figure 1 , including:

[0053] The engine controller (Engine Control Module, ECM) 11 connected to the bus.

[0054] The engine 12 connected to the engine controller 11.

[0055] The clutch 13 connected to the engine 12 through the combustion engine shaft (CES).

[0056] The transmission 14 connected to the clutch 13 through the input shaft (Input shaft, IPS). The transmission 14 is connected to the final drive through the output shaft (output shaft, OPS), and the final drive is connected to the vehicle wheel end.

[0057] The vehicle control unit (Vehicle Control Unit, VCU) / automatic transmission control unit (Transmission Control Unit, TCU) 15 connected to the bus, abbreviated as VCU / TCU. The VCU / TCU is used to control the transmission 14 and the clutch 13, that is, the content in the dashed box in the figure.

[0058] The traction motor controller (TC) 16 connected to the bus.

[0059] The motor 17 connected to the motor controller 16. The motor 17 is connected to the transmission 14 through the e-motor shaft.

[0060] The battery management system connected to the bus.

[0061] The energy storage system (Energy Storage System, ESS) 19 connected to the battery management system 18. The energy storage system 19 is connected to the motor 17.

[0062] The first embodiment of the output shaft drive detection method provided by this application is applied to Figure 1 The output shaft torque detection system described above. Refer to Figure 2 , the output shaft drive detection method may include:

[0063] The vehicle controller determines the first actual torque and the first actual torque threshold of the transmission output shaft. If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter the safe state.

[0064] S11: The vehicle controller obtains a first parameter set of the hybrid vehicle, where the first parameter set includes a first accelerator pedal signal collected by a first accelerator pedal sensor.

[0065] S12: Obtain a second accelerator pedal signal collected by a second accelerator pedal sensor and an actual torque estimated by the motor function layer from the motor controller.

[0066] S13: Calculate the first actual torque and the first actual torque threshold based on the first parameter set, the second accelerator pedal signal, and the actual torque estimated by the motor function layer.

[0067] S14: If it is determined that the first actual torque is greater than the first actual torque threshold, trigger the hybrid vehicle to enter a safe state.

[0068] The motor controller determines the second actual torque and the second actual torque threshold of the transmission output shaft. If it is determined that the second actual torque is greater than the second actual torque threshold, trigger the hybrid vehicle to enter a safe state.

[0069] S21: The motor controller obtains a second parameter set of the hybrid vehicle, where the second parameter set includes a second accelerator pedal signal collected by a second accelerator pedal sensor.

[0070] S22: Obtain a first accelerator pedal signal collected by a first accelerator pedal sensor from the vehicle controller.

[0071] S23: Calculate the second actual torque and the second actual torque threshold based on the second parameter set and the first accelerator pedal signal.

[0072] S24: If it is determined that the second actual torque is greater than the second actual torque threshold, trigger the hybrid vehicle to enter a safe state.

[0073] It can be seen from the above technical features that the present invention has the following beneficial effects:

[0074] The present invention can use two independent devices, namely the vehicle controller and the motor controller, to monitor the output shaft. In the case where the vehicle controller obtains invalid parameters, the parameters obtained by the motor controller can also be used to monitor the output shaft. Similarly, in the case where the motor controller obtains invalid parameters, the parameters obtained by the vehicle controller can also be used to monitor the output shaft.

[0075] The vehicle controller and the electric vehicle controller are independent and redundant, and both monitor the output shaft torque, so as to ensure that the output shaft torque can be calculated as much as possible and ensure the monitoring of the output shaft torque of the hybrid vehicle as much as possible.

[0076] In addition, the vehicle controller uses a first parameter set to calculate the actual torque of the output shaft, and the motor controller uses a second parameter set to calculate the actual torque of the output shaft. Although there may be an intersection between the first parameter set and the second parameter set, some parameters are still different and the processes of calculating the actual torque are also different. The purpose is to avoid the simultaneous failure of two independent monitoring methods of the vehicle controller and the motor controller when some parameters become invalid and cause the calculation process to be invalid.

[0077] The present application provides a second embodiment of the output shaft drive detection method, which is applied to the above output shaft torque detection system. Refer to Figure 3 , the output shaft drive detection method may include:

[0078] The vehicle controller collects a first accelerator pedal signal through a first accelerator pedal sensor;

[0079] The vehicle controller collects the output shaft speed through an output shaft speed sensor;

[0080] The vehicle controller collects the clutch position through a clutch position sensor;

[0081] The vehicle controller collects the synchronizer position through a synchronizer position sensor;

[0082] The vehicle controller collects the input shaft speed through an input shaft speed sensor;

[0083] The vehicle controller receives the actual torque output by the engine function layer through an engine controller.

[0084] The vehicle controller calculates the first actual torque threshold of the output shaft through the first accelerator pedal signal, the second accelerator pedal signal, and the output shaft speed;

[0085] The vehicle controller estimates the clutch state through the clutch position;

[0086] The vehicle controller estimates the gear information of the motor and the gear information of the engine through the synchronizer position;

[0087] The vehicle controller calculates the first actual torque transmitted to the wheel end of the hybrid vehicle through the clutch state, the gear information, the actual torque output by the engine function layer, and the actual torque output by the motor function layer.

[0088] If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state.

[0089] The motor controller collects a second accelerator pedal signal through a second accelerator pedal sensor;

[0090] The motor controller receives a vehicle speed signal from an external system;

[0091] The motor controller acquires the motor speed through a motor shaft speed sensor;

[0092] The motor controller receives the actual torque and the engine speed output by the engine functional layer from the engine controller ECM;

[0093] The vehicle controller acquires the input shaft speed through an input shaft speed sensor.

[0094] The motor controller calculates a second actual torque threshold based on the first accelerator pedal signal, the second accelerator pedal signal, and the vehicle speed signal;

[0095] The motor controller estimates the motor gear information based on the vehicle speed signal and the motor speed;

[0096] The motor controller estimates the engine gear information based on the input shaft speed and the vehicle speed signal;

[0097] The motor controller determines the clutch state based on the engine speed, the input shaft speed, and the actual torque estimated by the engine monitoring layer;

[0098] The motor controller calculates the second actual torque transmitted to the wheel end of the hybrid vehicle based on the motor gear information, the engine gear information, the actual torque estimated by the engine monitoring layer, the clutch state, and the actual torque estimated by the motor monitoring layer.

[0099] If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state.

[0100] See Figure 1 , this application also provides an output shaft drive detection system, including:

[0101] A first vehicle controller connected to a first accelerator pedal sensor, configured to determine a first actual torque and a first actual torque threshold of the transmission output shaft, and if it is determined that the first actual torque is greater than the first actual torque threshold, trigger the hybrid vehicle to enter a safe state;

[0102] A motor controller connected to a second accelerator pedal sensor, configured to determine a second actual torque and a second actual torque threshold of the transmission output shaft, and if it is determined that the second actual torque is greater than the second actual torque threshold, trigger the hybrid vehicle to enter a safe state.

[0103] Wherein, the vehicle controller determining the first actual torque and the first actual torque threshold of the transmission output shaft includes:

[0104] The vehicle controller obtains a first parameter set of a hybrid vehicle, where the first parameter set includes a first accelerator pedal signal collected by a first accelerator pedal sensor;

[0105] Obtain a second accelerator pedal signal collected by a second accelerator pedal sensor and an actual torque estimated by a motor function layer from the motor controller;

[0106] Based on the first parameter set, the second accelerator pedal signal, and the actual torque estimated by the motor function layer, calculate the first actual torque and the first actual torque threshold.

[0107] Among them, the vehicle controller obtaining the first parameter set of the hybrid vehicle includes:

[0108] The vehicle controller collects a first accelerator pedal signal through a first accelerator pedal sensor;

[0109] The vehicle controller collects an output shaft speed through an output shaft speed sensor;

[0110] The vehicle controller collects a clutch position through a clutch position sensor;

[0111] The vehicle controller collects a synchronizer position through a synchronizer position sensor;

[0112] The vehicle controller collects an input shaft speed through an input shaft speed sensor and sends it to the motor controller;

[0113] The vehicle controller receives the actual torque output by the engine function layer through the engine controller.

[0114] Among them, the calculating the first actual torque and the first actual torque threshold based on the first parameter set and the second accelerator pedal signal includes:

[0115] The vehicle controller calculates the first actual torque threshold of the output shaft through the first accelerator pedal signal, the second accelerator pedal signal, and the output shaft speed;

[0116] The vehicle controller estimates the clutch state through the clutch position;

[0117] The vehicle controller estimates the gear information of the motor and the engine gear information through the synchronizer position;

[0118] The vehicle controller calculates the first actual torque transmitted to the wheel end of the hybrid vehicle through the clutch state, the gear information, the actual torque estimated by the engine function layer, and the actual torque estimated by the motor function layer.

[0119] Among them, the motor controller determines the second actual torque and the second actual torque threshold of the transmission output shaft, including:

[0120] The motor controller obtains a second parameter set of the hybrid vehicle, where the second parameter set includes a second acceleration pedal signal collected by a second acceleration pedal sensor;

[0121] Obtain a first acceleration pedal signal collected by a first acceleration pedal sensor from the vehicle controller;

[0122] Based on the second parameter set and the first acceleration pedal signal, calculate the second actual torque and the second actual torque threshold.

[0123] Among them, the motor controller obtaining the second parameter set of the hybrid vehicle includes:

[0124] The motor controller collects a second acceleration pedal signal through a second acceleration pedal sensor;

[0125] The motor controller receives a vehicle speed signal from an external system;

[0126] The motor controller collects the motor shaft speed through a motor shaft speed sensor;

[0127] The motor controller receives the actual torque and engine speed estimated by the engine monitoring layer from the engine controller;

[0128] The vehicle controller collects the input shaft speed through an input shaft speed sensor.

[0129] Among them, the calculating the second actual torque and the second actual torque threshold based on the second parameter set and the first acceleration pedal signal includes:

[0130] The motor controller calculates a second actual torque threshold through the first acceleration pedal signal, the second acceleration pedal signal and the vehicle speed signal;

[0131] The motor controller estimates the motor gear information through the vehicle speed signal and the motor shaft speed;

[0132] The motor controller estimates the engine gear information through the input shaft speed and the vehicle speed signal;

[0133] The motor controller determines the clutch state through the engine speed, the input shaft speed and the actual torque estimated by the engine monitoring layer;

[0134] The motor controller calculates the second actual torque transmitted to the wheel end of the hybrid vehicle through the motor gear information, the engine gear information, the actual torque estimated by the engine monitoring layer, the clutch state and the actual torque estimated by the motor monitoring layer.

[0135] If the functions described in the method of this embodiment are implemented in the form of software function units and sold or used as independent products, they can be stored in a storage medium readable by a computing device. Based on this understanding, the part of the present invention embodiment that contributes to the prior art or part of this technical solution can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions for causing a computing device (which can be a personal computer, server, mobile computing device, or network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0136] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts between the various embodiments, reference can be made to each other.

[0137] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An output shaft drive detection method, characterized in that Including: The vehicle controller determines the first actual torque and the first actual torque threshold of the transmission output shaft. If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state. The motor controller determines the second actual torque and the second actual torque threshold of the transmission output shaft. If it is determined that the second actual torque is greater than the second actual torque threshold, the hybrid vehicle is triggered to enter a safe state. Among them, the vehicle controller determining the first actual torque and the first actual torque threshold of the transmission output shaft includes: The vehicle controller obtains a first parameter set of the hybrid vehicle, where the first parameter set includes a first accelerator pedal signal collected by a first accelerator pedal sensor. Obtain the second accelerator pedal signal collected by the second accelerator pedal sensor and the actual torque estimated by the motor function layer from the motor controller. Based on the first parameter set, the second accelerator pedal signal, and the actual torque estimated by the motor function layer, calculate the first actual torque and the first actual torque threshold. The motor controller determining the second actual torque and the second actual torque threshold of the transmission output shaft includes: The motor controller obtains a second parameter set of the hybrid vehicle, where the second parameter set includes a second accelerator pedal signal collected by a second accelerator pedal sensor. Obtain the first accelerator pedal signal collected by the first accelerator pedal sensor from the vehicle controller. Based on the second parameter set and the first accelerator pedal signal, calculate the second actual torque and the second actual torque threshold.

2. The method according to claim 1, wherein The vehicle controller obtaining the first parameter set of the hybrid vehicle further includes: The vehicle controller collects the output shaft speed through an output shaft speed sensor. The vehicle controller collects the clutch position through a clutch position sensor. The vehicle controller collects the synchronizer position through a synchronizer position sensor. The vehicle controller collects the input shaft speed through an input shaft speed sensor and sends it to the motor controller. The vehicle controller receives the actual torque output by the engine function layer through the engine controller.

3. The method according to claim 2, characterized in that, The calculating the first actual torque and the first actual torque threshold based on the first parameter set, the second accelerator pedal signal, and the actual torque estimated by the motor function layer includes: The vehicle controller calculates the first actual torque threshold of the output shaft through the first accelerator pedal signal, the second accelerator pedal signal, and the output shaft speed. The vehicle controller estimates the clutch state through the clutch position. The vehicle controller estimates the gear information of the motor and the engine gear information through the synchronizer position. The vehicle controller calculates the first actual torque transmitted to the wheel end of the hybrid vehicle through the clutch state, the gear information of the motor, the engine gear information, the actual torque estimated by the engine function layer, and the actual torque estimated by the motor function layer.

4. The method according to claim 1, characterized in that The motor controller obtaining the second parameter set of the hybrid vehicle further includes: The motor controller receives a vehicle speed signal from an external system. The motor controller collects the motor shaft speed through a motor shaft speed sensor. The motor controller receives the actual torque and engine speed estimated by the engine monitoring layer from the engine controller; The vehicle controller collects the input shaft speed through the input shaft speed sensor.

5. The method according to claim 4, characterized in that, Calculating the second actual torque and the second actual torque threshold based on the second parameter set and the first accelerator pedal signal includes: The motor controller calculates the second actual torque threshold through the first accelerator pedal signal, the second accelerator pedal signal, and the vehicle speed signal; The motor controller estimates the motor gear information through the vehicle speed signal and the motor shaft speed; The motor controller estimates the engine gear information through the input shaft speed and the vehicle speed signal; The motor controller determines the clutch state based on the engine speed, the input shaft speed, and the actual torque estimated by the engine monitoring layer; The motor controller calculates the second actual torque transmitted to the wheel end of the hybrid vehicle through the motor gear information, the engine gear information, the actual torque estimated by the engine monitoring layer, the clutch state, and the actual torque estimated by the motor monitoring layer.

6. An output shaft drive detection system, characterized in that, According to the output shaft drive detection method according to any one of claims 1-5, the output shaft drive detection system includes: A first vehicle controller connected to the first accelerator pedal sensor, configured to determine the first actual torque and the first actual torque threshold of the transmission output shaft. If it is determined that the first actual torque is greater than the first actual torque threshold, the hybrid vehicle is triggered to enter a safe state; A motor controller connected to the second accelerator pedal sensor, configured to determine the second actual torque and the second actual torque threshold of the transmission output shaft. If it is determined that the second actual torque is greater than the second actual torque threshold, the hybrid vehicle is triggered to enter a safe state.

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