Control method, system and device of differential lock in vehicle, vehicle and storage medium

Abstract

Embodiments of the present application provide a control method, system and device of a differential lock in a vehicle, a vehicle and a storage medium, and relate to the technical field of vehicle control. The method comprises: receiving an on-off activation signal from a CTP (Console Touch Panel) or an IHU (Infotainment Head Unit); generating control information according to the on-off activation signal, the control information being used to control the state of the differential lock, the state of the differential lock comprising a locked state and an unlocked state; and controlling the differential lock to be in the locked state or the unlocked state according to the control information. The technical solution provided by the embodiments of the present application can ensure the driving safety of the vehicle after the vehicle is rescued.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of vehicle control, and in particular, relate to a control method, system and device for a differential lock in a vehicle, a vehicle and a storage medium. BACKGROUND

[0002] The driving mode of a vehicle includes two-wheel drive and four-wheel drive.

[0003] In the related art, for a four-wheel drive vehicle, after the tires of the vehicle sink into mud, a water pit or the like, a user can manually control the differential lock to be locked, so that the left and right wheels of the vehicle have the same speed, thereby facilitating the vehicle to escape from the trouble.

[0004] However, in the above related art, the driver often forgets to unlock the differential lock after the vehicle escapes from the trouble, so that the vehicle is prone to rollover when high-speed steering, thereby affecting the safety of vehicle driving. SUMMARY

[0005] Embodiments of the present application provide a control method, system and device for a differential lock in a vehicle, a vehicle and a storage medium, which can ensure the safety of vehicle driving after the vehicle escapes from the trouble. The technical solutions provided by embodiments of the present application are as follows.

[0006] According to an aspect of the present application, a control method for a differential lock in a vehicle is provided, the method comprising:

[0007] receiving an on-off activation signal from a CTP (Console Touch Panel) or an IHU (Infotainment Head Unit);

[0008] generating control information according to the on-off activation signal, the control information being used to control a state of the differential lock, the state of the differential lock including a locked state and an unlocked state;

[0009] controlling the differential lock to be in the locked state or the unlocked state according to the control information.

[0010] In some embodiments, the vehicle includes a relay, an electromagnetic coil and an HCU (Hybrid Control Unit), an electrical connection exists between an output end of the relay and the electromagnetic coil, the HCU is provided with a high-side driving end and a low-side driving end, and an electrical connection exists between an input end of the relay and the HCU.

[0011] The controlling the differential lock to be in the locked state according to the control information includes:

[0012] controlling the high-side drive end and the low-side drive end to be turned on with the relay respectively;

[0013] wherein, in a case that the high-side drive end and the low-side drive end are turned on with the relay respectively, the relay is closed, the electromagnetic coil is input with a first current and attracts the differential lock.

[0014] In some embodiments, the generating the control information according to the switch activation signal comprises:

[0015] In a case that two continuous frames of switch activation signals from the CTP or the IHU are received and the vehicle satisfies a first condition, generating first control information according to the two continuous frames of switch activation signals, the first control information being used to control the differential lock to keep the locked state;

[0016] In a case that two continuous frames of switch activation signals from the CTP or the IHU are received and the vehicle satisfies a second condition, generating second control information according to the two continuous frames of switch activation signals, the second control information being used to control the differential lock to keep the unlocked state.

[0017] In some embodiments, the first condition comprises:

[0018] the vehicle is in a high-pressure readiness Ptready state;

[0019] a driving mode of the vehicle is one of a snow mode, a sand mode, and an off-road mode;

[0020] a vehicle speed of the vehicle is less than or equal to a first threshold value;

[0021] a wheel speed difference between any two wheels of the vehicle is less than or equal to a second threshold value;

[0022] a rear axle torque of the vehicle is less than or equal to a third threshold value;

[0023] the vehicle has a tank steering TAB function and the TAB function is in an inactive state;

[0024] a power supply voltage of the vehicle is in a first voltage range;

[0025] the differential lock has no fault.

[0026] In some embodiments, the second condition comprises at least one of:

[0027] the vehicle exits the Ptready state;

[0028] a CTP hard switch of the vehicle is triggered;

[0029] The switch of the IHU of the vehicle is triggered;

[0030] The vehicle speed is greater than or equal to a fourth threshold value;

[0031] The driving mode of the vehicle is switched from one of a snow mode, a sand mode, and an off-road mode to another mode.

[0032] In some embodiments, the method further comprises:

[0033] According to the state of the differential lock, the instrument is controlled to display first prompt information, and the first prompt information is used to show the state of the differential lock and the vehicle.

[0034] According to an aspect of an embodiment of the present application, a control system for a differential lock in a vehicle is provided, the system comprising: a differential lock, a hybrid vehicle control unit (HCU), a CTP, and an infotainment host unit (IHU), the HCU and the CTP being in communication connection, and the HCU and the IHU being in communication connection; wherein:

[0035] The CTP or the IHU is configured to send a switch activation signal to the HCU;

[0036] The HCU is configured to generate control information according to the switch activation signal, the control information being used to control the state of the differential lock, the state of the differential lock including a locked state and an unlocked state; and the HCU is configured to control the differential lock to be in the locked state or the unlocked state according to the control information.

[0037] In some embodiments, the control system for the differential lock comprises: an electronic differential lock (including an electromagnetic coil), a differential lock control circuit, an HCU controller, a CTP hard switch, an IHU soft switch, and an ICM instrument.

[0038] The HCU and the CTP are in communication connection, and the HCU and the IHU are in communication connection; wherein:

[0039] The CTP or the IHU is configured to send a switch activation signal to the HCU;

[0040] The HCU is configured to master the differential lock switch strategy, including: receiving the switch activation signal sent by the CTP or the IHU, judging the differential lock opening or closing condition, executing the control of the differential lock circuit on-off, and delivering the differential lock state to the instrument;

[0041] The differential lock control circuit is configured to turn on the differential lock electromagnetic coil according to the HCU control signal, and deliver the circuit on-off signal to the HCU;

[0042] The ICM instrument is used for receiving the differential lock state sent by the HCU to display corresponding indicator light and prompt information.

[0043] The indicator light includes five states: the indicator light is off in the unlocking state, the indicator light is green and always on in the locking state, the indicator light is yellow and flashes in the condition not satisfied state, the indicator light is green and flashes in the high-speed alarm state, the indicator light is yellow and always on in the disconnection stuck fault state, and the indicator light is red and always on in the closure stuck state.

[0044] According to an aspect of the embodiment of the present application, a control device of a differential lock in a vehicle is provided, and the device comprises:

[0045] A signal receiving module is configured to receive a switch activation signal from a CTP or an IHU.

[0046] An information generating module is configured to generate control information according to the switch activation signal, and the control information is used to control the state of the differential lock, and the state of the differential lock includes a locking state and an unlocking state.

[0047] A differential lock control module is configured to control the differential lock to be in the locking state or the unlocking state according to the control information.

[0048] In some embodiments, the vehicle includes a relay, an electromagnetic coil, and an HCU, an electrical connection exists between the output end of the relay and the electromagnetic coil, the HCU is provided with a high-side driving end and a low-side driving end, and the input end of the relay is in electrical connection with the HCU.

[0049] The differential lock control module is configured to:

[0050] Control the high-side driving end and the low-side driving end to be turned on with the relay, respectively.

[0051] In the case where the high-side driving end and the low-side driving end are turned on with the relay, respectively, the relay is closed, the electromagnetic coil is connected with a first current, and the differential lock is attracted.

[0052] In some embodiments, the information generating module is configured to:

[0053] In the case where two continuous frames of switch activation signals are received from the CTP or the IHU, and the vehicle satisfies a first condition, generate first control information according to the two continuous frames of switch activation signals, and the first control information is used to control the differential lock to keep the locking state.

[0054] In a case where two continuous frame switch activation signals from the CTP or the IHU are received and the vehicle satisfies a second condition, second control information is generated according to the two continuous frame switch activation signals, the second control information being used to control the differential lock to keep the unlocked state.

[0055] In some embodiments, the first condition comprises:

[0056] The vehicle is in a high pressure readiness Ptready state;

[0057] The driving mode of the vehicle is one of a snow mode, a sand mode, and an off-road mode;

[0058] The vehicle speed of the vehicle is less than or equal to a first threshold value;

[0059] The wheel speed difference between any two wheels of the vehicle is less than or equal to a second threshold value;

[0060] The rear axle torque of the vehicle is less than or equal to a third threshold value;

[0061] The vehicle has a tank steering TAB function and the TAB function is in an inactive state;

[0062] The power supply voltage of the vehicle is in a first voltage range;

[0063] The differential lock has no fault.

[0064] In some embodiments, the second condition comprises at least one of:

[0065] The vehicle exits the Ptready state;

[0066] The CTP hard switch of the vehicle is triggered;

[0067] The switch of the IHU of the vehicle is triggered;

[0068] The vehicle speed of the vehicle is greater than or equal to a fourth threshold value;

[0069] The driving mode of the vehicle is switched from one of the snow mode, the sand mode, and the off-road mode to another mode.

[0070] In some embodiments, the apparatus further comprises:

[0071] An information display module is configured to control the instrument to display first prompt information according to the state of the differential lock, the first prompt information being used to show the state of the differential lock and the vehicle.

[0072] According to an aspect of the embodiments of the present application, a vehicle is provided, the vehicle comprising a processor and a memory, the memory having stored therein a computer program, the computer program being loaded and executed by the processor to implement the control method of the differential lock in the vehicle.

[0073] According to an aspect of the embodiments of the present application, a computer readable storage medium is provided, the computer readable storage medium having stored therein a computer program, the computer program being loaded and executed by a processor to implement the control method of the differential lock in the vehicle.

[0074] According to an aspect of the embodiments of the present application, a computer program product is provided, the computer program product being loaded and executed by a processor to implement the control method of the differential lock in the vehicle.

[0075] The technical solutions provided by the embodiments of the present application can include the following beneficial effects:

[0076] The vehicle judges the locking and unlocking of the differential lock according to the switch activation signal of the CTP or the IHU, and automatically controls the locking and unlocking of the differential lock, so as to realize the automatic control of the differential lock according to the actual situation, thereby avoiding the driving accidents caused by the driver forgetting to unlock the differential lock, and ensuring the driving safety of the vehicle after the vehicle is rescued.

[0077] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0078] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0079] Figure 1 is a flow chart of the control method of the differential lock in the vehicle provided by an embodiment of the present application;

[0080] Figure 2 is a schematic diagram of the control system of the differential lock in the vehicle provided by an embodiment of the present application;

[0081] Figure 3 is a block diagram of the control device of the differential lock in the vehicle provided by an embodiment of the present application. DETAILED DESCRIPTION

[0082] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present application. Instead, it is merely an example of a method consistent with some aspects of the present application as detailed in the appended claims.

[0083] The drive mode of a four-wheeled vehicle (such as a car) refers to the arrangement of the engine and the number and position of the drive wheels. According to the number of drive wheels, it can be divided into two-wheel drive and four-wheel drive. A general vehicle has front and rear wheels, and the wheels directly driven by the engine to rotate and thus push (or pull) the car forward are the drive wheels.

[0084] A two-wheel drive (which can be referred to as two-wheel drive) vehicle can slip even on a good road surface, or in snow or slippery road conditions, and is more likely to have a tail swing when starting and accelerating.

[0085] Four-wheel drive, which can be referred to as four-wheel drive, refers to the front and rear wheels of a vehicle being powered, and the engine output torque can be distributed on the four wheels in different proportions according to the road surface state to improve the driving ability of the vehicle. Four-wheel drive can be represented by 4X4 or 4WD. The four-wheel drive system has a more excellent engine driving force application efficiency than the two-wheel drive system, and can achieve better tire traction and steering force, better driving stability.

[0086] The differential lock can lock the differential when the vehicle is in a single-wheel slip situation, so that the left and right wheel speeds are consistent, and the torque can be more conveniently transferred from the slipping end to the other end, thereby realizing escape. When the driver uses the differential lock function to escape, forgets to unlock the differential lock, and drives at high speed and turns, the left and right wheels have no speed difference, which causes the vehicle to easily roll over and thus endangers the safety of the driver and passengers. In view of this, the present application provides a control method for a differential lock in a vehicle. The technical scheme provided by the present application can be applied to a four-wheel drive vehicle, such as a PHEV (Plug-in Hybrid Electric Vehicle, plug-in hybrid electric vehicle) four-wheel drive hybrid car with a rear axle differential lock configuration.

[0087] In some embodiments, the control method for a differential lock in a vehicle provided by the present application is applied to a control system for a differential lock in a vehicle. In some embodiments, the system includes an HCU, a CTP, and an IHU, and the HCU and the CTP are in communication connection, and the HCU and the IHU are in communication connection.

[0088] In some embodiments, the HCU is configured to receive a whole-vehicle power supply gear signal, a vehicle speed signal, left and right rear wheel speed signals, a driving mode signal, a power supply voltage signal, and a switch signal of the differential lock, so as to determine an opening condition of the differential lock, a state jump, a lighting strategy, a fault diagnosis, and a degradation strategy, etc.

[0089] In some embodiments, the IHU can also be referred to as a cockpit large screen, i.e., a human-machine interaction screen at the front end of the in-vehicle space. The IHU is configured to send a differential lock soft switch request to the HCU, and accept a differential lock state signal fed back by the HCU for state display.

[0090] In some embodiments, the CTP can also be referred to as a differential lock hardware switch. The CTP is configured to send a differential lock hard switch request to the HCU, accept a differential lock state signal fed back by the HCU, and control a corresponding indicator light according to the differential lock state signal.

[0091] In some embodiments, the system further comprises a relay, a differential lock electromagnetic coil, and a freewheeling diode.

[0092] In some embodiments, the relay is directly connected to the HCU port by a hard wire, and receives an HCU voltage signal, for realizing control of the differential lock hardware.

[0093] In some embodiments, the differential lock electromagnetic coil is a direct control unit of the differential lock hardware connector. After the relay is closed, the power supply is turned on, the electromagnetic coil generates a magnetic force to attract the differential lock terminal, so as to realize locking of the differential lock.

[0094] In some embodiments, the freewheeling diode is configured to guide the residual current in the electromagnetic coil to the ground terminal at the moment when the relay is disconnected, so as to realize protection of the controller port.

[0095] In some embodiments, the system further comprises an ICM (Instrument Cluster Module, instrument cluster module). In some embodiments, the ICM can also be referred to as a cockpit instrument. The ICM is configured to receive a differential lock state signal sent by the HCU, so as to perform corresponding lighting operation on the instrument according to the state value, and pop up a corresponding prompt window.

[0096] In the following, several embodiments are used to introduce and illustrate the technical solutions of the present application.

[0097] Please refer to Figure 1 which shows a flowchart of a control method of a differential lock in a vehicle according to an embodiment of the present application. In this embodiment, the method is mainly applied to the HCU introduced above. The method can comprise at least one of the following steps (110-130).

[0098] Step 110, receiving the switch activation signal from the CTP or the IHU.

[0099] In some embodiments, the CTP or the IHU can send a hard switch request to the HCU as a differential lock hardware switch. In some embodiments, the hard switch request carries the switch activation signal. In some embodiments, the switch activation signal can be used to indicate the unlocking of the differential lock.

[0100] In some embodiments, the automatic unlocking of the differential lock can be achieved by receiving the switch activation signal from the CTP to unlock the differential lock.

[0101] In some embodiments, the manual unlocking of the differential lock can be achieved by receiving the switch activation signal from the IHU to unlock the differential lock, since the cockpit large screen of the IHU is controlled by the driver.

[0102] In some embodiments, if the hard switch request carries the switch closing signal, the hard switch request is used to indicate the locking of the differential lock.

[0103] In some embodiments, the CTP or the IHU can be used to accept the differential lock state signal fed back by the HCU and indicated by the corresponding indicator.

[0104] Step 120, generating control information according to the switch activation signal, the control information being used to control the state of the differential lock, the state of the differential lock including the locking state and the unlocking state.

[0105] In some embodiments, the HCU generates the corresponding control information if the received switch activation signal meets the conditions.

[0106] Step 130, controlling the differential lock to be in the locking state or the unlocking state according to the control information.

[0107] In the embodiments of the present application, the differential lock control system is used to realize the normal locking and unlocking functions of the differential lock, and to ensure that the vehicle can escape from the trouble when locked. Moreover, the differential lock control system ensures that the vehicle can be driven normally and safely after escaping from the trouble (considering that the inside and outside wheel speeds are locked and prone to rollover, the differential lock cannot be used for high-speed and large-angle turning after being locked).

[0108] In some embodiments, if the control information is to control the differential lock to be unlocked, the relay is opened; if the control information is to control the differential lock to be locked, the relay is closed.

[0109] In conclusion, the technical scheme provided by the embodiments of the present application can realize automatic control of the differential lock according to actual conditions, thereby avoiding driving accidents caused by the driver forgetting to unlock the differential lock, and ensuring driving safety of the vehicle after the vehicle is rescued.

[0110] In some possible implementation manners, the vehicle includes a relay, an electromagnetic coil, and an HCU, an output end of the relay is electrically connected with the electromagnetic coil, the HCU is provided with a high-speed data (High Speed Data, HSD) end and a low-speed data (Low Speed Data, LSDL) end, an input end of the relay is electrically connected with the HCU; and the differential lock is controlled to be in the locked state according to control information, including: the HSD end and the LSDL end are controlled to be respectively conducted with the relay; and in the case that the HSD end and the LSDL end are respectively conducted with the relay, the relay is closed, the electromagnetic coil is input with a first current, and the differential lock is attracted.

[0111] In some embodiments, the input end of the relay is connected with the HCU through a hard wire, and the HCU collects a signal of the relay closing through the hard wire, so as to determine the locked / unlocked state of the differential lock.

[0112] In some embodiments, the HCU is provided with two ports (the HSD end and the LSDL end) for controlling the relay to be attracted, the HSD end is connected with a positive electrode of an internal power supply of the HCU, and the LSDL end is connected with a ground end of the HCU, and the HCU controls the relay by controlling conduction of the two ends of the HSD end and the LSDL end. The normal unlocked state is that the HSD end is conducted and the LSDL end is disconnected, and the locked state is that the HSD end is conducted and the LSDL end is conducted. In this embodiment, when a certain end is adhered to cause a short circuit, the other end can be disconnected in time, so that the differential lock is kept in the unlocked state, thereby improving driving safety.

[0113] In some embodiments, the control information is generated according to the switch activation signal, including:

[0114] In a case that two continuous frames of the switch activation signal are received from the CTP or the IHU, and the vehicle satisfies a first condition, first control information is generated according to the two continuous frames of the switch activation signal, the first control information is used to control the differential lock to keep the locked state; and in a case that two continuous frames of the switch activation signal are received from the CTP or the IHU, and the vehicle satisfies a second condition, second control information is generated according to the two continuous frames of the switch activation signal, the second control information is used to control the differential lock to keep the unlocked state.

[0115] In some embodiments, the HCU receives a CTP hard switch signal or an IHU soft switch signal (the HCU responds only when it receives two consecutive frame switch activation signals, and does not respond again within 2 seconds).

[0116] In some embodiments, the first condition comprises:

[0117] the vehicle is in a high pressure readiness Ptready state;

[0118] a driving mode of the vehicle is one of a snow mode, a sand mode, and an off-road mode;

[0119] a vehicle speed of the vehicle is less than or equal to a first threshold value;

[0120] a wheel speed difference between any two wheels of the vehicle is less than or equal to a second threshold value;

[0121] a rear axle torque of the vehicle is less than or equal to a third threshold value;

[0122] the vehicle has a tank steering TAB function and the TAB function is in an inactive state;

[0123] a supply voltage of the vehicle is in a first voltage range;

[0124] the differential lock has no fault.

[0125] In some embodiments, the first threshold value can be 4 km / h, the second threshold value can be 7 km / h, the third threshold value can be 1350 N.m, and the first voltage range can be 10.6 V-12 V. That is, the first condition comprises at least one of the following: (1) the vehicle is in the Ptready state; (2) the driving mode is in the snow / sand / off-road mode; (3) the vehicle speed is lower than 4 km / h and the wheel speed difference is less than 7 km / h; (4) the rear axle torque is within 1350 N.m, and if the condition is not met, the HCU actively controls the rear axle wheel end torque to be within 1350 N.m; (5) the TAB function is not activated (if any); (6) the supply voltage is within the range of 10.6 V-12 V; and (7) the differential lock is in an unlocked state and has no fault.

[0126] In some embodiments, if the first condition is met, the HCU controls the high-side drive end and the low-side drive end to be turned on, at which time the relay is closed, KL30 electricity is passed into the electromagnetic coil, and a magnetic force is generated to attract the differential lock.

[0127] In some embodiments, the second condition comprises at least one of the following:

[0128] the vehicle exits the Ptready state;

[0129] a CTP hard switch of the vehicle is triggered;

[0130] The switch of the IHU of the vehicle is triggered;

[0131] The vehicle speed of the vehicle is greater than or equal to a fourth threshold value;

[0132] The driving mode of the vehicle is switched from one of the snow mode, the sand mode and the off-road mode to another mode.

[0133] In some embodiments, the fourth threshold value can be 30 km / h.

[0134] In some embodiments, after triggering the overspeed unlocking, when the vehicle speed falls below 30 km / h again, the differential lock is not automatically locked again.

[0135] In some embodiments, the first threshold value, the second threshold value, the third threshold value, the fourth threshold value and the first voltage range can also have other values, which can be set by a person skilled in the art according to actual conditions, and the embodiments of the present application do not make specific limitations.

[0136] In some embodiments, the differential lock fault determination condition includes at least one of the following: the HCU determines whether the differential lock is locked by reading back the relay input signal conduction, compares the read back signal with the request value, and determines whether to enter a fault state. The following are fault state determination conditions: (1) locking failure, request locking and read back unlocking; (2) unlocking failure, request unlocking and read back locking; (3) accidental locking, unlocking state read back to accidental locking; (4) accidental unlocking, locking state read back to accidental unlocking.

[0137] In some embodiments, the system degradation processing when the fault occurs: mainly for locking stuck, that is, in the locked state, the system is degraded for processing when the differential lock is closed and stuck. When the differential lock closing stuck fault is detected, the HCU sends a high side drive and low side drive disconnection request, and controls the vehicle speed to be limited below 30 km / h, and the current driving cycle no longer responds to the differential lock switch request of the CTP and the IHU.

[0138] In some embodiments, the method further comprises: according to the state of the differential lock, controlling the instrument to display first prompt information, and the first prompt information is used to show the state of the differential lock and the vehicle.

[0139] In some embodiments, the cockpit instrument has a differential lock state indicator light, which displays according to the differential lock and vehicle state sent by the HCU, including: (1) when the differential lock is in the locked state and the vehicle speed is lower than 20 km / h, the indicator light is green and always on; (2) when the differential lock is in the locked state and the vehicle speed is between 20-30 km / h, the indicator light is green and flashes; (3) when the differential lock is in the unlocked state, the indicator light is off; (4) when the differential lock is in the unlocked state and the locking condition is not met, the CTP switch or the large screen soft switch is pressed, the instrument indicator light flashes yellow for 5s and pops up a pop-up window with the text "Condition not met, cannot lock, please park and operate"; (5) when the differential lock is in the disconnection and jam fault state, the indicator light is yellow and always on, and the text "Differential lock locking failure, please contact 4S store" is prompted; (6) when the differential lock is in the locking and jam fault state, the indicator light is red and always on, and the text "Differential lock unlocking failure, speed limit driving, please contact 4S store" is prompted; (7) when the differential lock is in the unlocking / locking process state, the indicator light is green and flashes.

[0140] In the above implementation manner, the HCU performs locking and unlocking judgment of the differential lock according to the switch activation signal of the CTP / IHU, the power gear signal, the ESP vehicle speed signal, and the ESP left rear and right rear wheel speed signals, and completes the differential lock locking process by low-level effective control of the electromagnetic coil closing.

[0141] Please refer to Figure 2 , which shows a differential lock control system in a vehicle provided by an embodiment of the present application. As Figure 2 shown, the system 200 includes: a differential lock, a hybrid vehicle controller HCU, a CTP, and an IHU, the HCU and the CTP are in communication connection, and the HCU and the IHU are in communication connection; wherein:

[0142] The CTP or the IHU is configured to send a switch activation signal to the HCU;

[0143] The HCU is configured to generate control information according to the switch activation signal, the control information being used to control the state of the differential lock, the state of the differential lock including a locked state and an unlocked state; and according to the control information, the differential lock is controlled to be in the locked state or the unlocked state.

[0144] In some embodiments, the differential lock control system includes: an electronic differential lock (including an electromagnetic coil), a differential lock control circuit, an HCU controller, a CTP hard switch, an IHU soft switch, and an ICM instrument.

[0145] In some embodiments, there is a communication connection between the HCU and the CTP, and a communication connection between the HCU and the IHU. Among them, the CTP or the IHU is used to send a switch activation signal to the HCU; the HCU is used to master the differential lock switch strategy, which includes: receiving the switch activation signal sent by the CTP or the IHU, judging the differential lock opening or closing condition, executing the control of the differential lock circuit, and transmitting the differential lock state to the instrument.

[0146] In some embodiments, the differential lock control circuit is used to turn on the differential lock electromagnetic coil according to the HCU control signal, and transmit the circuit conduction signal to the HCU.

[0147] In some embodiments, the ICM instrument is used to receive the differential lock state sent by the HCU for corresponding indicator light and prompt information display. Among them, the indicator light includes five states: the indicator light is extinguished in the unlocked state, the indicator light is always green in the locked state, the indicator light is yellow and flashes in the condition not meeting the condition, the indicator light is green and flashes in the high-speed alarm state, the indicator light is yellow and always on in the disconnection jam fault state, and the indicator light is red and always on in the closed jam state.

[0148] In the embodiments of the present application, the safety mechanism of the differential lock control method includes at least one of the following:

[0149] 1. The driver actively clicks the switch to lock, without automatic locking function.

[0150] 2. The driver clicks the switch button, and the IHU or CTP sends three frames of activation signals. The HCU needs to receive two consecutive activation signals to judge that the driver operates the switch, so as to ensure that there is no false triggering of interference.

[0151] 3. The differential lock is locked only when all the locking conditions are met, and the unlocking condition only needs to meet any one. Among them, the vehicle speed reaching a certain threshold value automatically unlocks.

[0152] 4. The HCU hardware controls the differential lock attraction through a double-contact switch (high-side drive and low-side drive), preventing single-point control from causing short circuit and affecting driving safety.

[0153] 5. The HCU is provided with a back-reading signal for monitoring the circuit conduction, indirectly monitoring the actual state of the differential lock. When the differential lock is stuck in the locked state, the HCU controls the vehicle speed limit to ensure driving safety.

[0154] 6. A freewheeling diode is provided in the circuit, and the back-reading signal is directly connected to the HCU. When the relay is disconnected, the residual current in the differential lock electromagnetic coil will generate a reverse electromotive force, causing damage to the HCU back-reading end. The freewheeling diode is used to guide the residual current to the ground terminal to solve the problem.

[0155] 7. The instrument corresponds to the whole vehicle and the differential lock state, reminding the driver through the indicator light and prompt text, including:

[0156] (1) The indicator light is off in the unlocked state;

[0157] (2) The indicator light is green and always on in the locked state;

[0158] (3) If the condition is not met, the indicator light is yellow and flashes, and the prompt information "differential lock locking failure, condition not met, please park and operate" is played or displayed;

[0159] (4) The indicator light is green and flashes in the high-speed alarm state;

[0160] (5) The indicator light is yellow and always on in the disconnection and jam fault state, and the prompt information "differential lock locking failure, please contact the 4S store" is played or displayed;

[0161] (6) The indicator light is red and always on in the closed jam state, and the text prompt "differential lock unlocking failure, speed limit driving, please contact the 4S store" is displayed.

[0162] In summary, in the technical scheme provided by the embodiment of the application, the vehicle judges the locking and unlocking of the differential lock according to the on-off activation signal of the CTP or IHU, and automatically controls the locking and unlocking of the differential lock, realizing automatic control of the differential lock according to the actual situation, thereby avoiding driving accidents caused by the driver forgetting to unlock the differential lock, and improving the safety of vehicle driving.

[0163] The following is an embodiment of the application device, which can be used to execute the method embodiment of the application. For details not disclosed in the device embodiment of the application, please refer to the method embodiment of the application.

[0164] Please refer to Figure 3 which shows a block diagram of a differential lock control device in a vehicle according to an embodiment of the application. The device has the function of implementing the above-mentioned example of the control method of the differential lock in the vehicle, which can be realized by hardware or corresponding software executed by hardware. The device can be the HCU introduced above, or can be arranged on the HCU. The device 300 can include a signal receiving module 310, an information generating module 320, and a differential lock control module 330.

[0165] The signal receiving module 310 is configured to receive an on-off activation signal from a CTP or IHU.

[0166] The information generating module 320 is configured to generate control information according to the on-off activation signal, the control information being used to control the state of the differential lock, the state of the differential lock including a locked state and an unlocked state.

[0167] The differential lock control module 330 is configured to control the differential lock to be in the locked state or the unlocked state according to the control information.

[0168] In some embodiments, the vehicle comprises a relay, an electromagnetic coil, and an HCU, an output end of the relay is electrically connected to the electromagnetic coil, the HCU is provided with a high-side driving end and a low-side driving end, an input end of the relay is electrically connected to the HCU;

[0169] The differential lock control module 330 is configured to:

[0170] control the high-side driving end and the low-side driving end to be turned on respectively;

[0171] In the case where the high-side driving end and the low-side driving end are turned on respectively, the relay is closed, the electromagnetic coil is supplied with a first current, and the differential lock is attracted.

[0172] In some embodiments, the information generation module 320 is configured to:

[0173] In the case where the vehicle satisfies a first condition, and two continuous frames of switch activation signals are received from the CTP or the IHU, generate first control information according to the two continuous frames of switch activation signals, the first control information being used to control the differential lock to keep the locked state;

[0174] In the case where the vehicle satisfies a second condition, and two continuous frames of switch activation signals are received from the CTP or the IHU, generate second control information according to the two continuous frames of switch activation signals, the second control information being used to control the differential lock to keep the unlocked state.

[0175] In some embodiments, the first condition comprises:

[0176] The vehicle is in a high-pressure readiness Ptready state;

[0177] The driving mode of the vehicle is one of a snow mode, a sand mode, and an off-road mode;

[0178] The vehicle speed of the vehicle is less than or equal to a first threshold value;

[0179] The wheel speed difference between any two wheels of the vehicle is less than or equal to a second threshold value;

[0180] The rear axle torque of the vehicle is less than or equal to a third threshold value;

[0181] The vehicle has a tank steering TAB function and the TAB function is in an inactive state;

[0182] a supply voltage of the vehicle is in a first voltage range;

[0183] the differential lock is fault-free.

[0184] In some embodiments, the second condition comprises at least one of:

[0185] the vehicle exits the Ptready state;

[0186] a CTP hard switch of the vehicle is triggered;

[0187] a switch of an IHU of the vehicle is triggered;

[0188] a vehicle speed of the vehicle is greater than or equal to a fourth threshold value;

[0189] a driving mode of the vehicle is switched from one of a snow mode, a sand mode, and an off-road mode to another mode.

[0190] In some embodiments, the apparatus further comprises an information display module.

[0191] the information display module is configured to control the instrument to display first prompt information according to the state of the differential lock, the first prompt information being used to show the state of the differential lock and the vehicle.

[0192] In summary, in the technical scheme provided by the embodiments of the present application, the vehicle judges the locking and unlocking of the differential lock according to the switch activation signal of the CTP or the IHU, and automatically controls the locking and unlocking of the differential lock, so as to realize the automatic control of the differential lock according to the actual situation, thereby avoiding the driving accidents caused by the driver forgetting to unlock the differential lock, and ensuring the driving safety of the vehicle after the vehicle is rescued.

[0193] It should be noted that the apparatus provided in the above embodiments is only used as an example for the division of the above functional modules in realizing the functions thereof, and in actual application, the above functions can be completed by different functional modules according to the needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process is described in detail in the method embodiments, which will not be repeated here.

[0194] In some embodiments, a vehicle is also provided, which comprises a processor and a memory, the memory storing a computer program, the computer program being loaded and executed by the processor to implement the control method of the differential lock in the vehicle described above.

[0195] In some embodiments, a computer readable storage medium is also provided, and the computer readable storage medium stores a computer program loaded and executed by a processor to implement the control method of the differential lock in the vehicle.

[0196] In some embodiments, a computer program product is also provided, and the computer program product is loaded and executed by a processor to implement the control method of the differential lock in the vehicle.

[0197] It should be understood that "multiple" mentioned herein refers to two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0198] The above only describes exemplary embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control method of a differential lock in a vehicle, characterized by, The method comprises: receiving a switch activation signal from a center console touch panel (CTP) or an infotainment head unit (IHU); in a case where two consecutive frames of the switch activation signal are received from the CTP or the IHU and the vehicle satisfies a first condition, generating first control information according to the two consecutive frames of the switch activation signal, the first control information being used to control the differential lock to keep a locked state, the state of the differential lock including the locked state and an unlocked state, the first condition including: the vehicle being in a high-pressure ready (Ptready) state; the driving mode of the vehicle being one of a snow mode, a sand mode, and an off-road mode; the vehicle speed of the vehicle being less than or equal to a first threshold value; the wheel speed difference between any two wheels of the vehicle being less than or equal to a second threshold value; the rear axle torque of the vehicle being less than or equal to a third threshold value; the vehicle having a tank steering (TAB) function and the TAB function being in an inactive state; the power supply voltage of the vehicle being within a first voltage range; and the differential lock being fault-free; in a case where two consecutive frames of the switch activation signal are received from the CTP or the IHU and the vehicle satisfies a second condition, generating second control information according to the two consecutive frames of the switch activation signal, the second control information being used to control the differential lock to keep the unlocked state, the second condition including at least one of: the vehicle exiting the Ptready state; the CTP hard switch of the vehicle being triggered; the switch of the IHU of the vehicle being triggered; the vehicle speed of the vehicle being greater than or equal to a fourth threshold value; and the driving mode of the vehicle being switched from one of the snow mode, the sand mode, and the off-road mode to another mode; controlling the differential lock to be in the locked state or the unlocked state according to the first control information or the second control information.

2. The method of claim 1, wherein, The vehicle comprises a relay, an electromagnetic coil, and a hybrid vehicle control unit (HCU), there is an electrical connection between the output end of the relay and the electromagnetic coil, the HCU is provided with a high-side drive end and a low-side drive end, and there is an electrical connection between the input end of the relay and the HCU; controlling the high-side drive end and the low-side drive end to be respectively turned on; wherein, in a case where the high-side drive end and the low-side drive end are respectively turned on, the relay is closed, the electromagnetic coil is supplied with a first current, and the differential lock is attracted. The method further comprises:

3. The method of claim 1, wherein, controlling the instrument to display first prompt information according to the state of the differential lock, the first prompt information being used to show the state of the differential lock and the vehicle. The system is used to implement the control method of the differential lock in the vehicle of any one of claims 1 to 3, and the system comprises a differential lock, a hybrid vehicle control unit (HCU), a center console touch panel (CTP), and an infotainment head unit (IHU), there is a communication connection between the HCU and the CTP, and there is a communication connection between the HCU and the IHU; wherein:

4. A control system for a differential lock in a vehicle, characterized in that ​ The CTP or the IHU is configured to send a switch activation signal to the HCU; The HCU is configured to, in a case that two continuous frames of switch activation signals from the CTP or the IHU are received and the vehicle satisfies a first condition, generate first control information according to the two continuous frames of switch activation signals, the first control information being configured to control the differential lock to keep a locked state, the state of the differential lock including the locked state and an unlocked state, the first condition including that the vehicle is in a high pressure readiness Ptready state, that a driving mode of the vehicle is one of a snow mode, a sand mode and an off-road mode, that a vehicle speed of the vehicle is less than or equal to a first threshold value, that a wheel speed difference between any two wheels of the vehicle is less than or equal to a second threshold value, that a rear axle torque of the vehicle is less than or equal to a third threshold value, that the vehicle has a tank steering TAB function and the TAB function is in an inactive state, that a power supply voltage of the vehicle is in a first voltage range, and that the differential lock has no fault; In a case that two continuous frames of switch activation signals from the CTP or the IHU are received and the vehicle satisfies a second condition, generate second control information according to the two continuous frames of switch activation signals, the second control information being configured to control the differential lock to keep the unlocked state, the second condition including at least one of that the vehicle exits the Ptready state, that a CTP hard switch of the vehicle is triggered, that a switch of an IHU of the vehicle is triggered, that the vehicle speed of the vehicle is greater than or equal to a fourth threshold value, and that the driving mode of the vehicle is switched from one of the snow mode, the sand mode and the off-road mode to another mode. Control the differential lock to be in the locked state or the unlocked state according to the first control information or the second control information.

5. A control device for a differential lock in a vehicle, characterized in that The apparatus is configured to implement the control method of the differential lock in the vehicle according to any one of the preceding claims 1 to 3, and the apparatus includes: a signal receiving module configured to receive a switch activation signal from a CTP or an IHU; The information generation module is configured to, in a case where two continuous switch activation signals from the CTP or the IHU are received and the vehicle satisfies a first condition, generate first control information according to the two continuous switch activation signals, the first control information being used to control the differential lock to keep in a locked state, the state of the differential lock including the locked state and an unlocked state; the first condition including: the vehicle being in a high pressure ready Ptready state; the driving mode of the vehicle being one of a snow mode, a sand mode, and an off-road mode; the vehicle speed of the vehicle being less than or equal to a first threshold value; the wheel speed difference between any two wheels of the vehicle being less than or equal to a second threshold value; the rear axle torque of the vehicle being less than or equal to a third threshold value; the vehicle having a tank steering TAB function and the TAB function being in an inactive state; the power supply voltage of the vehicle being in a first voltage range; the differential lock being fault-free; in a case where two continuous switch activation signals from the CTP or the IHU are received and the vehicle satisfies a second condition, generating second control information according to the two continuous switch activation signals, the second control information being used to control the differential lock to keep in the unlocked state; the second condition including at least one of: the vehicle exiting the Ptready state; the CTP hard switch of the vehicle being triggered; the switch of the IHU of the vehicle being triggered; the vehicle speed of the vehicle being greater than or equal to a fourth threshold value; the driving mode of the vehicle being switched from one of the snow mode, the sand mode, and the off-road mode to another mode. The differential lock control module is configured to control the differential lock to be in the locked state or the unlocked state according to the first control information or the second control information.

6. A vehicle characterized by comprising: The vehicle includes a processor and a memory, the memory storing a computer program, the computer program being loaded and executed by the processor to implement the control method of the differential lock in the vehicle of any one of claims 1 to 3.

7. A computer readable storage medium characterized in that, The computer readable storage medium stores a computer program, the computer program being loaded and executed by the processor to implement the control method of the differential lock in the vehicle of any one of claims 1 to 3.

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