A periodic testing method and system for vehicle static current
Through the current acquisition of the periodic wake-up controller and vehicle control module, the problem that the vehicle quiescent current sensor cannot be reported in real time is solved, and low-cost, general vehicle quiescent current monitoring and remote viewing is realized, reducing battery consumption and improving monitoring reliability and versatility.
Patent Information
- Application Number
- CN202211210453.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-09-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2042-09-30
AI Technical Summary
The existing quiescent current sensors of vehicles cannot report current values in real time after the vehicle sleeps. The traditional methods are costly, not universal and cannot be viewed remotely, so they cannot be monitored in time.
By periodically awakening the controller, the vehicle control module is awakened and the trigger current is generated through the load module, the vehicle current is collected, and the vehicle static current is determined using the formula I static = I1-I0-I2-I3, and it is integrated into the vehicle control module. Load module and control switch to realize periodic testing and monitoring of current.
It reduces the quiescent current consumption of the vehicle and is low in cost. It is suitable for a variety of bus networks, real-time monitoring and remote viewing of the quiescent current of the vehicle are realized, and the reliability and versatility of monitoring are improved.
Smart Images
Figure CN115437356B_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of automobile technology, and in particular relates to a periodic testing method and system for static current of a vehicle. Background Art
[0002] Existing current sensors based on load judgment and with bus signals generally have a static current below 1mA and an operating current above 16mA-30mA.
[0003] When the sensor is working normally, the measured current can be uploaded through the bus message. When the vehicle ignition lock key is turned off, the vehicle power switch is turned off, and the electronic control system is dormant, the load current in the circuit is lower than the current sensor wake-up value, and after a certain period of time, the sensor enters a silent state.
[0004] The current sensor in silent state cannot upload the implementation information to the background. It can only be awakened and the implementation current of the vehicle can be known when the whole vehicle starts to power on, the vehicle electronic control system is awakened from sleep, and the load current of the current sensor exceeds the awakening critical value.
[0005] Some current sensors are kept in a silent state, and the static current is monitored at a certain frequency, which is stored as historical data. When the vehicle is awakened from hibernation and the vehicle's electronic control system is working normally,
[0006] In the above conventional solution, after the vehicle is dormant, the static current value of the vehicle cannot be reported in real time, and can only be reported normally when the vehicle electronic control system is in a non-sleeping state.
[0007] If the vehicle is left idle for dozens of days or months, and the battery is always depleted to the point where the vehicle cannot be started, and the instruments and other controllers cannot be powered on, not only will it be impossible to obtain the static current information in a timely manner, but it will also fail to provide a warning that the static current is being consumed too much or for too long.
[0008] If the above sensors are not in sleep mode and always keep uploading data, the static current value of the whole vehicle will increase significantly, which will burden the static storage time of the vehicle battery and reduce the sleep time of the whole vehicle.
[0009] By searching relevant literature, the method mentioned in "CN109116085B-A System and Method for Monitoring Static Current of Automobiles" uses the current sensor's own self-wake-up cycle to wake up the electronic control network to store the collected signal in the body controller, and then the maintenance personnel use the diagnostic instrument to read the historical data to see if the static current is abnormal. This method has three limitations:
[0010] The sensor is specially designed and has a high cost;
[0011] Special sensors can only be used in LIN bus networks, not in other networks such as CAN bus;
[0012] Moreover, historical data can only be viewed on-site through a diagnostic instrument, and the static current cannot be viewed remotely. Summary of the invention
[0013] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a low-cost and highly versatile vehicle static current periodic testing method and system.
[0014] The technical solution adopted by the present invention is: a periodic testing method for static current of a vehicle,
[0015] After the wake-up controller periodically wakes itself up, it determines whether the periodic wake-up conditions of the vehicle control module are met;
[0016] If the periodic wake-up condition of the vehicle control module is met, the vehicle control module is woken up;
[0017] After the vehicle control module is awakened, it controls the load module connected to the battery circuit to generate a trigger current;
[0018] A current acquisition module connected to the battery circuit is awakened based on the trigger current;
[0019] After being awakened, the current acquisition module collects the vehicle current and sends it to the vehicle control module;
[0020] The vehicle control module determines the vehicle static current according to the vehicle current, and sends the vehicle static current to the wake-up controller.
[0021] Furthermore, the vehicle static current is determined by the following formula:
[0022] I 静态 =I1-I0-I2-I3,
[0023] Among them, I 静态 is the static current of the vehicle; I0 is the wake-up current of the current acquisition module; I1 is the whole vehicle current; I2 is the working current of the whole vehicle control module; I3 is the working current of the wake-up controller.
[0024] Furthermore, the wake-up controller periodically detects the timing time since the last wake-up of the vehicle control module in real time after the wake-up. If the timing time reaches the calibration time, it is determined that the periodic wake-up condition of the vehicle control module is met.
[0025] Furthermore, the calibration time is 5-10 hours.
[0026] Furthermore, the vehicle control module controls the load module to be disconnected after the load module is connected for a set time.
[0027] A periodic test system for static current of a vehicle includes a wake-up controller, a vehicle control module, a current acquisition module, a load module and a control switch. The current acquisition module, the control switch, the load module and a battery are connected in series to form a loop.
[0028] The wake-up controller is used for periodic self-wake-up, and after self-wake-up, determines whether the calibration time for waking up the vehicle control module has been reached, and if so, sends a wake-up signal to the vehicle control module;
[0029] The vehicle control module is used to control the control switch to close after receiving the wake-up signal, and is used to determine the vehicle static current according to the vehicle current, and send the vehicle static current to the wake-up controller;
[0030] The current acquisition module is used to detect the vehicle current after the control switch is closed and send it to the vehicle control module.
[0031] Furthermore, the vehicle static current is determined by the following formula:
[0032] I 静态 =I1-I0-I2-I3,
[0033] Among them, I 静态 is the static current of the vehicle; I0 is the wake-up current of the current acquisition module; I1 is the vehicle current; I2 is the working current of the vehicle control module; I3 is the working current of the wake-up controller;
[0034] Furthermore, the load module and the control switch are integrated into the vehicle control module.
[0035] Furthermore, the load module is a light bulb or a solenoid valve or a relay.
[0036] Furthermore, the vehicle control module controls the control switch to be opened after the control switch is closed for a set time.
[0037] The beneficial effects of the present invention are:
[0038] The present invention uses a controller that periodically wakes up a control module through a periodic self-wake-up controller of the vehicle. This control module achieves the wake-up condition of a current sensor that measures the static current of the vehicle by controlling the consumption of the load. After the current sensor is awakened, the load is turned off to reduce the static current consumption of the entire vehicle. The entire device can be completed by relying on existing equipment on the vehicle, with low cost, no need to design special sensors, and very little increase in hardware cost.
[0039] The present invention periodically collects the current of the entire vehicle to determine the static current of the vehicle. The period can be set according to actual needs. Long-term monitoring can be performed when the vehicle is stationary. The vehicle inventory party or user can be reminded through the background to pay attention to static current abnormalities. The static current test solution is simple and highly reliable.
[0040] The static current test solution of the present invention can be applied not only to LIN bus network, but also to other networks such as CAN bus, and has strong versatility; the wake-up controller transmits the static current to the background or the user's mobile terminal, which can facilitate the user to remotely view the static current and control it in real time. BRIEF DESCRIPTION OF THE DRAWINGS
[0041] Figure 1 It is a test flow chart of the present invention.
[0042] Figure 2 It is a schematic diagram of the principle of the test system of the present invention. DETAILED DESCRIPTION
[0043] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0044] like Figure 1 As shown, the present invention provides a periodic test method for static current of a vehicle, using a wake-up controller with a periodic self-wake-up function already on the vehicle, such as a T-box, and after the wake-up controller periodically self-wakes up, it is determined whether the periodic wake-up condition of the vehicle control module is met;
[0045] If the periodic wake-up condition of the vehicle control module is met, the vehicle control module is woken up by bus (such as DCAN) or hard line;
[0046] After the vehicle control module is awakened, it controls the load module connected to the battery circuit to generate a trigger current. The trigger current is generally greater than the wake-up current of the current acquisition module. Therefore, after the load is connected, there is current in the circuit, and the current acquisition module can be awakened to collect current.
[0047] A current acquisition module connected to the battery circuit is awakened based on the trigger current;
[0048] After being awakened, the current acquisition module collects the vehicle current and sends it to the vehicle control module;
[0049] The vehicle control module determines the vehicle static current according to the vehicle current, and sends the vehicle static current to the wake-up controller.
[0050] In the above scheme, the vehicle control module determines the vehicle static current through the following formula:
[0051] I 静态 =I1-I0-I2-I3,
[0052] Among them, I 静态 is the static current of the vehicle; I0 is the critical wake-up current of the current acquisition module, which is the characteristic parameter of the current acquisition module; I1 is the vehicle current, that is, the current in the battery circuit after the load module is turned on; I2 is the working current of the vehicle control module; I3 is the working current of the wake-up controller.
[0053] In the above scheme, the wake-up controller periodically detects the timing time since the last wake-up of the vehicle control module in real time after periodic self-awakening. If the timing time reaches the calibration time, it is determined that the periodic wake-up condition of the vehicle control module is met. The calibration time is 5-10h, preferably 8h.
[0054] In the above scheme, the vehicle control module controls the load module to be disconnected after the set time is reached. The set time is a calibrated value, generally 2-5s. Since the vehicle power main switch and ignition lock key are not turned on, the vehicle control module will automatically enter a dormant state after a period of time, and the vehicle electronic control system remains dormant and silent, and will only work when the T-box periodically wakes it up, avoiding excessive consumption of the battery energy of the stationary vehicle.
[0055] To implement the above static current test method, Figure 2 As shown, the present invention also provides a periodic test system for static current of a vehicle, including a wake-up controller, a vehicle control module, a current acquisition module, a load module and a control switch, wherein the current acquisition module, the control switch, the load module and the battery are connected in series to form a loop, and the wake-up controller and the vehicle control module are connected by a bus (such as DCAN) or hard wire. The current acquisition module is a conventional current sensor, and its critical wake-up current is generally 300mA.
[0056] The wake-up controller is used for periodic self-wake-up, and after self-wake-up, determines whether the calibration time for waking up the vehicle control module has been reached, and if so, sends a wake-up signal to the vehicle control module;
[0057] The vehicle control module is used to control the control switch to close after receiving the wake-up signal, and is used to determine the vehicle static current according to the vehicle current, and send the vehicle static current to the wake-up controller;
[0058] The current acquisition module is used to detect the vehicle current after the control switch is closed and send it to the vehicle control module.
[0059] In the above scheme, the load module and the control switch can be integrated into the vehicle control module as a built-in load of the vehicle control module; it can also be any form of external load, such as a light bulb, solenoid valve, relay, etc., or other excitation sources that can serve as driving current for the wake-up current sensor.
[0060] In the above scheme, the vehicle control module is usually a controller that has a bus connection relationship with the current sensor, such as a PCU controller that collects LIN signals or CAN signals uploaded by the current sensor. It can be a separate controller, or the engine controller (EECU), vehicle controller (HCU or VCU), or instrument can play its role.
[0061] Example
[0062] In this embodiment, the wake-up controller adopts a T-box, the vehicle control module adopts a PCU (power control unit), the current acquisition module is a current sensor, and the load module and the control switch are the resistive load and transistor built into the PCU.
[0063] After the vehicle goes into sleep mode, the T-box wakes up periodically every 120 seconds, determines the time since the last wake-up of the PCU, and wakes up the PCU through the DCAN bus after 8 hours.
[0064] When the PCU is awakened by the T-box in the above manner, the PCU connects its own built-in resistive load for a specific time, such as a 300mA resistive load for 2s. When the awakening condition of the current sensor is met, the resistive load is disconnected.
[0065] After the current sensor is awakened, it collects the real-time current I1 of the vehicle and sends it to the PCU. The PCU converts the real-time current of the vehicle into the static current of the vehicle under normal conditions:
[0066] I 静态 =I1-300mA-I2-I3.
[0067] Among them, I2 is the working current of PCU at this time, and I3 is the working current of t-box at this time.
[0068] The PCU will convert the static current of the whole vehicle under normal conditions and send it to the bus network (such as BCAN) where the T-box is located, and the T-box will upload the static current of the whole vehicle to the background.
[0069] The PCU disconnects the resistive load after 2 seconds. Because the vehicle's main power switch and ignition lock key are not turned on, the PCU will automatically enter the sleep state after 30 seconds, and the vehicle's electronic control system remains in sleep mode.
[0070] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.
[0071] In order to make the description of the present disclosure more detailed and complete, the above description is provided for the implementation and specific embodiments of the present invention; however, this is not the only form of implementing or using the specific embodiments of the present invention. The implementation covers the features of multiple specific embodiments and the method steps and sequences used to construct and operate these specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.
[0072] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
[0073] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
[0074] The disclosed embodiments are described above to enable any person skilled in the art to implement or use the present invention. Various modifications of these embodiments are obvious to those skilled in the art, and the general principles defined herein may also be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments given herein, but is consistent with the broadest scope of the principles and novel features disclosed in this application.
[0075] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.
Claims
1. A periodic test method for static current of a vehicle, characterized in that: After the wake-up controller periodically wakes itself up, it determines whether the periodic wake-up conditions of the vehicle control module are met; If the periodic wake-up condition of the vehicle control module is met, the vehicle control module is woken up; After the vehicle control module is awakened, it controls the load module connected to the battery circuit to generate a trigger current; A current acquisition module connected to the battery circuit is awakened based on the trigger current; After being awakened, the current acquisition module collects the vehicle current and sends it to the vehicle control module; The vehicle control module determines the vehicle static current according to the vehicle current, and sends the vehicle static current to the wake-up controller; The vehicle static current is determined by the following formula: I 静态 =I1-I0-I2-I3, Among them, I 静态 is the static current of the vehicle; I0 is the wake-up current of the current acquisition module; I1 is the whole vehicle current; I2 is the working current of the whole vehicle control module; I3 is the working current of the wake-up controller.
2. The periodic test method of vehicle static current according to claim 1, characterized in that: The wake-up controller periodically detects the time since the last wake-up of the vehicle control module in real time after periodic self-awakening. If the time reaches the calibration time, it is determined that the periodic wake-up condition of the vehicle control module is met.
3. The periodic testing method of vehicle static current according to claim 2, characterized in that: The calibration time is 5-10 hours.
4. The periodic testing method of vehicle static current according to claim 1, characterized in that: The vehicle control module controls the load module to be turned on and then turns off the load module after a set time has passed.
5. A periodic test system for static current of a vehicle, characterized in that: It includes a wake-up controller, a vehicle control module, a current acquisition module, a load module and a control switch. The current acquisition module, the control switch, the load module and the battery are connected in series to form a loop. The wake-up controller is used for periodic self-wake-up, and after self-wake-up, determines whether the calibration time for waking up the vehicle control module has been reached, and if so, sends a wake-up signal to the vehicle control module; The vehicle control module is used to control the control switch to close after receiving the wake-up signal, and is used to determine the vehicle static current according to the vehicle current, and send the vehicle static current to the wake-up controller; The current acquisition module is used to detect the vehicle current after the control switch is closed and send it to the vehicle control module; The vehicle static current is determined by the following formula: I 静态 =I1-I0-I2-I3, Among them, I 静态 is the static current of the vehicle; I0 is the wake-up current of the current acquisition module; I1 is the whole vehicle current; I2 is the working current of the whole vehicle control module; I3 is the working current of the wake-up controller.
6. The periodic test system for static current of a vehicle according to claim 5, characterized in that: The load module and the control switch are both integrated on the vehicle control module.
7. The periodic test system for static current of a vehicle according to claim 5, characterized in that: The load module is a light bulb, a solenoid valve or a relay.
8. The periodic test system for static current of a vehicle according to claim 5, characterized in that: The vehicle control module controls the control switch to be closed for a set time and then controls the control switch to be opened.