A hybrid transmission rapid oil filling and pressure building control method, system, vehicle and computer readable storage medium

Abstract

The present invention proposes a hybrid transmission fast oil filling and pressure building control method, system, vehicle and computer-readable storage medium, the purpose of which is to solve the incompatibility problem between the selection of low-power small oil pump and the driving experience. The method of the present invention includes: responding to the vehicle trigger signal, activating the vehicle CAN, waking up the TCU control unit to enter the initialization, the TCU control unit waking up the electronic oil pump to enter the oil filling mode, and when the accumulator pressure reaches the target pressure, it is fed back to the PCU control unit, and the PCU control unit determines that the ready condition is met and sends a ready signal. The present invention is a set of fast oil filling parallel control logic, which can enable a small displacement oil pump to fill oil at a lower speed of the oil pump motor to ensure NVH, and at the same time reduce the driver's waiting time to drive quickly. Through the scheme of the present invention, it is ultimately possible to achieve the effect of low power consumption of the electronic oil pump and excellent driving experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle starting control, and in particular relates to a transmission oil filling and pressure building control technology when a vehicle is started. Background Art

[0002] The currently developed transmissions generally use a power source to drive a mechanical pump (engine or drive motor), and a single oil pump supplies energy for the entire hydraulic system pressure and cooling circuit; some also use a dual oil pump system, usually one mechanical pump and one electronic pump, most working conditions are powered by the mechanical pump, and a few working conditions are assisted by the electronic pump. As the degree of electrification of the entire vehicle continues to increase, the requirements for fuel consumption and power consumption are further tightened, and the electronic oil pump system will further replace the mechanical oil pump. Among them, the pressure circuit, the use of an electronic oil pump + accumulator combination solution is an important trend in future applications. For the electronic oil pump + accumulator combination solution, since the hydraulic pressure of the pressure circuit is relatively high and the electronic oil pump can accurately control the supply flow, in order to reduce the load and motor power, improve efficiency and reduce energy consumption, the oil pump displacement of the pressure circuit is further selected to be smaller. In this technical environment, after the vehicle is turned off and parked for a long time, the hydraulic system pressure returns to zero. After the vehicle is powered on, the transmission will be refilled with oil and pressure will be built up. Since the pressure oil pump displacement is small and the accumulator capacity is large, the first time the accumulator is filled with oil, it usually takes a long time (more than 10 seconds), which ultimately leads to a long waiting time for the end user to drive after powering on, and a large number of complaints (the current waiting time for hybrid commercial vehicles from powering on to ready to drive is no more than 2 seconds under normal temperature conditions), resulting in incompatibility between the optimal economic selection of the electronic oil pump and the driver and passenger experience.

[0003] For existing hybrid vehicles, the driver must wait for the vehicle dashboard to display "ready" before driving, and the target pressure of the hybrid transmission pressure circuit is one of the conditions for the vehicle to determine whether it meets the "ready" condition. According to normal control logic, the vehicle electrical system will start working only after the driver enters the cockpit and powers on the vehicle. The whole preparation process is as follows: Figure 1 As shown, the driver enters the cockpit and powers on, the TCU controller is initialized, and then the electronic oil pump controller is initialized and controls the oil pump motor to rotate and fill the oil. When the accumulator pressure reaches the target pressure, the TCU notifies the vehicle controller PCU that the preparation is complete. The PCU finally determines whether it is ready and displays it on the instrument panel. The driver can then drive normally. It can be seen from the above process that the process from the driver's power-on action to the instrument displaying ready is the entire driver's waiting time. Therefore, in order to reduce the waiting time, due to the small displacement of the electronic oil pump, the motor speed needs to be increased to quickly reach the target pressure. However, when the speed is increased, the NVH noise will be larger, which is easy to cause customer complaints. If the motor speed is low, the driver's waiting time will be longer, which is also easy to cause customer complaints.

[0004] At present, the dual electronic pump + accumulator solution for hybrid transmissions of automobile companies has not been maturely applied. From the perspective of reducing the waiting time of drivers, there is a blank in the solution for optimizing the initial oil filling and pressure building. The existing technology proposes a method for controlling the oil filling time in the rapid oil filling stage of an automatic transmission. Its rapid oil filling control strategy is only used to accurately fill the clutch with oil, avoiding the oil filling time control being too long. The early engagement of the clutch in the oil pressure building stage will cause gear shift shock and affect the smoothness of the gear shift; and the control of the oil pressure is too small, which will cause the gear shift time to be prolonged, resulting in driving problems such as slow gear shift response. This solution realizes adaptive control of the clutch oil filling time in the rapid oil filling stage, improves the gear shift quality, and increases the coverage of the software. However, this method is not suitable for the scenario where the accumulator oil pressure needs to rise from 0 to the target pressure when the vehicle is powered on for the first time after being turned off and parked for a period of time. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention proposes a hybrid transmission rapid oil filling and pressure building control method, system, vehicle and computer-readable storage medium, focusing on the electronic pump + accumulator combination solution of the hybrid transmission, and proposing a set of rapid oil filling parallel control logic, which can enable a small-displacement oil pump to fill oil at a lower speed of the oil pump motor, while ensuring NVH and reducing the driver's waiting time for quick vehicle movement.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the invention, a hybrid transmission rapid oil filling and pressure building control method is provided, the control method comprising the following control process:

[0008] First, in response to the vehicle trigger signal, the vehicle CAN is activated, and then the TCU is awakened to enter the initialization. After the TCU initialization is completed, the TCU wakes up the electronic oil pump to enter the oil filling mode. The electronic oil pump starts to fill the accumulator with oil and build pressure. When the accumulator pressure reaches the target pressure, it is fed back to the PCU. After the PCU determines that the ready condition is met, it sends a ready signal.

[0009] With the above control method, it is not necessary to wait until the driver enters the vehicle and powers on the vehicle before starting the above oil filling step. Instead, during the above oil filling process, the driver can open the door normally, enter the vehicle, and then power on until the ready light is on. The two are carried out at the same time. The waiting time for the driver is the process from the driver powering on to the ready light being lit. Before the driver makes the power-on action, the accumulator oil filling action is completed in advance, thereby reducing the driver's waiting time and allowing the vehicle to move quickly.

[0010] Specifically, the vehicle use trigger signal is generally a key unlock signal when the driver uses a key to open the door, or a keyless entry unlock signal when the door is opened by keyless entry. Of course, in addition to the above commonly used vehicle use signals, it can also be other signals for opening the door, such as external trigger signals associated with the welcome mode, Bluetooth, and network connection, or brake signals before the vehicle starts.

[0011] Furthermore, in the above method, after the electronic oil pump enters the oil filling mode, the oil pump motor is controlled to run and fill the oil at an electronic speed that meets NVH, thereby reducing noise and increasing vehicle comfort.

[0012] Furthermore, the control method is for the application scenario where the vehicle is powered on for the first time after being turned off and parked for a period of time, that is, the first oil filling and pressure building are completed in this way.

[0013] In the second aspect of the invention, a hybrid transmission rapid oil filling and pressure building control system is also proposed, which includes a TCU control unit, a PCU control unit, a vehicle CAN, an electronic oil pump controller, an electronic oil pump, an accumulator and an instrument.

[0014] The vehicle CAN is used to respond to the vehicle trigger signal and wake up the TCU control unit.

[0015] The TCU control unit is used to enter and complete initialization after being awakened, and wake up the electronic oil pump controller to enter the oil filling mode.

[0016] The electronic oil pump controller is used to control the operation of the electronic oil pump to charge the accumulator with oil.

[0017] The accumulator is used to feed back the pressure to the PCU control unit after the pressure reaches the target pressure.

[0018] The PCU control unit is used to send a ready signal to the instrument after determining that the ready condition is met.

[0019] In a third aspect of the present invention, a vehicle is further provided. The vehicle is a hybrid vehicle and is equipped with the hybrid transmission rapid oil filling and pressure building control system described above.

[0020] In a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and the program is executed by a processor to implement the hybrid transmission rapid oil filling and pressure building control method as described in any one of claims 1 to 4.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention is used for hybrid vehicles to quickly charge the hybrid transmission with oil and build up pressure for driving. Compared with the traditional serial control logic, the present invention adopts a parallel control logic method, which can make a more energy-saving small electronic oil pump + accumulator solution meet the performance requirement of less than 2 seconds for the whole vehicle to start after power-on, reduce the waiting time of the driver, and improve the driving experience.

[0023] 2. By adopting the solution of the present invention, hybrid vehicles can select a smaller electronic oil pump + accumulator solution, which is more energy-efficient and has lower energy consumption than ordinary electronic oil pump solutions, and the matching oil pump motor design is also smaller and has low cost.

[0024] It can be seen that the main purpose of the present invention is to solve the incompatibility problem between the selection of a low-power small oil pump and the driving experience. Through the solution of the present invention, it is ultimately possible to achieve the effect of both low power consumption of the electronic oil pump and excellent driving experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Prior art hybrid transmission oil filling serial control logic method;

[0026] Figure 2 The dual electronic pump + accumulator combination solution and electrical architecture of the hybrid transmission;

[0027] Figure 3 Accumulator pressure working logic;

[0028] Figure 4 Flow chart of the hybrid transmission rapid oil filling and pressure building control method proposed by the present invention.

[0029] In the figure, 1 - oil pump, 2 - oil pump motor, 3 - switch solenoid valve, 4 - check valve, 5 - accumulator, 6 - pressure sensor. DETAILED DESCRIPTION

[0030] In order to make the purpose of the invention, detailed embodiments and advantages and disadvantages of the present invention presentable, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0031] The hybrid transmission fast oil filling and pressure building control method proposed in the present invention is based on a dual electronic pump + accumulator combined hydraulic solution as a hardware carrier, and aims to reduce the waiting time of the driver after powering on.

[0032] See also Figure 2It is an embodiment of the hardware structure of the dual electronic pump + accumulator combination scheme of the hybrid transmission. The oil pump motor 2 drives two oil pumps at the same time. The large-displacement oil pump is used for lubricating the cooling system circuit, and the small-displacement oil pump 1 is used for pressure circuit energy supply. Among them, the small-displacement oil pump 1 is the implementation focus of this scheme. The oil outlet of the small-displacement oil pump 1 is connected to the switch solenoid valve 3. The switch solenoid valve 3 controls the oil to enter the one-way valve 4 or directly leak back to the oil chamber according to the specified logic; the rear end of the one-way valve 4 is connected to the accumulator 5 and the pressure sensor 6, wherein the one-way valve 4 is used to block the oil reflux of the accumulator 5; the pressure sensor 6 is used to detect whether the pressure of the accumulator 5 reaches the target pressure. When the vehicle recognizes that the driver has driving needs, the oil pump motor 2 works to charge the accumulator 5. Only when the accumulator 5 reaches the target pressure can the ready condition be met. At the same time, the switch solenoid valve 3 leaks oil. At this time, the oil energy demand of the rear-end pressure circuit is provided by the accumulator 5, and the oil pump 1 can intermittently replenish oil according to the pressure control logic requirements of the accumulator 5. The dotted line end is mainly an electrical signal. The oil pump motor 2 is controlled by the motor. The motor controller can communicate with the TCU control unit through CAN communication. At the same time, the pressure sensor 6 signal is fed back to the TCU control unit; the TCU control unit communicates with the PCU control unit through CAN, and finally the relevant information can be displayed on the instrument panel.

[0033] Working logic: The motor is connected to the dual-pump system at the same time. The outlet of the large-displacement oil pump is connected to the lubrication and cooling oil circuit. The outlet of the small-displacement oil pump controls the rear-end pressure through the solenoid valve. The accumulator pressure is detected by the pressure sensor to feedback the real-time pressure value. Usually, after parking for a period of time, the accumulator pressure will drop to 0. The dotted line end is the electrical architecture. The motor is controlled by the motor controller i-pump, and the i-pump is controlled and communicated by the TCU. The pressure sensor feedbacks the signal to the TCU, and the TCU provides the target signal to communicate with the vehicle controller PCU. The PCU displays relevant information on the instrument through the vehicle CAN.

[0034] When the driver needs to drive, Figure 3 , the accumulator needs to be filled with oil for the first time, from the pressure 0 to the target pressure Pmax, to meet the ready preparation, which takes a relatively long time; when the target pressure Pmax is reached, the solenoid valve acts to drain the oil, and the small-displacement oil pump no longer charges the accumulator. At this time, the energy of the pressure circuit is provided by the accumulator, and the accumulator pressure continues to drop. After reaching the minimum target pressure Pmin, the solenoid valve acts to charge the oil, and the accumulator pressure is increased from Pmin to Pmax, and this cycle continues. After the accumulator is powered on and the first oil filling is completed, the pressure is not lower than Pmin, which meets the needs of driving at any time.

[0035] Since the accumulator 5 is an energy storage unit with a certain capacity, in order to solve the problem that the pressure of the accumulator 5 returns to zero after parking, causing the driver to wait too long for the first accumulator 5 to be filled, this embodiment provides a method for rapid filling parallel control, such as Figure 4 As shown:

[0036] When the driver unlocks the door with the key outside the vehicle, or unlocks the door through keyless entry, the vehicle CAN responds to the above unlocking signal, wakes up the TCU control unit to enter initialization, and after the initialization is completed, wakes up the electronic oil pump controller to make the electronic oil pump enter the oil filling mode, and controls the oil pump motor to run and fill the oil at a specified speed. The speed refers to the electronic speed that meets NVH, thereby avoiding the risk of motor NVH caused by a large speed. When the accumulator reaches the Pmax target pressure, the first oil filling is completed and fed back to the PCU as a ready condition. When the starting conditions are met, the PCU notifies the instrument panel to light up the ready light as soon as the vehicle is powered on. At the same time, the driver can open the door normally, enter the vehicle, and then power on until the ready light is on, and then drive away.

[0037] In this way, since the driver triggers the unlocking key outside the car, the TCU controls the electronic oil pump to charge the oil in advance. After the driver gets in the car, fastens the seat belt, and powers on, the driver only perceives the waiting time from power-on (one-button start) to the time when the ready light turns on. The waiting time is greatly shortened, avoiding the serial control logic, which requires the driver to power on, then initialize the controller, and charge the accumulator for the first time. This is equivalent to completing the accumulator charging action in advance before the driver makes the power-on action.

[0038] Of course, the way to activate the vehicle CAN, that is, the vehicle trigger signal, is not limited to the key unlock signal or the PE keyless entry unlock signal, but can also include all different external signal trigger modes such as welcome mode, Bluetooth, and Internet connection. In addition, for the scenario where the driver stays in the car for a long time after the vehicle is parked, the brake signal can be used to trigger the first oil filling and pre-fill the oil and build pressure to shorten the waiting time for driving.

[0039] In the following embodiment of the present application, a hybrid transmission rapid oil filling and pressure building control system is provided for executing the above Figure 4The control method shown in the figure, the system includes a TCU control unit, a PCU control unit, a vehicle CAN, an electronic oil pump controller, an electronic oil pump, an accumulator and an instrument. The vehicle CAN is used to respond to the vehicle trigger signal and wake up the TCU control unit. The TCU control unit is used to enter and complete initialization after being awakened, and wake up the electronic oil pump controller to enter the oil filling mode; the electronic oil pump controller is used to control the operation of the electronic oil pump to fill the accumulator with oil; the accumulator is used to feedback to the PCU control unit after the pressure reaches the target pressure; the PCU control unit is used to send a ready signal to the instrument panel display after determining that the ready condition is met.

[0040] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A hybrid transmission rapid oil filling and pressure building control method, characterized in that: In response to the vehicle trigger signal, the vehicle CAN is activated, the TCU control unit is awakened to enter the initialization mode, the TCU control unit wakes up the electronic oil pump to enter the oil filling mode, and when the accumulator pressure reaches the target pressure, it is fed back to the PCU control unit. The PCU control unit determines that the ready condition is met and sends a ready signal; The vehicle use trigger signal is a key unlock signal, a keyless entry unlock signal, or an external trigger signal associated with a welcome mode, Bluetooth, or networking.

2. The hybrid transmission rapid oil filling and pressure building control method according to claim 1, characterized in that: After the electronic oil pump enters the oil filling mode, the oil pump motor is controlled to run and fill the oil at an electronic speed that meets NVH.

3. The hybrid transmission rapid oil filling and pressure building control method according to claim 1 or 2, characterized in that: The control method is for the application scenario of powering on for the first time after the vehicle has been turned off and parked for a period of time.

4. A hybrid transmission rapid oil filling and pressure building control system, characterized in that: Including TCU control unit, PCU control unit, vehicle CAN, electronic oil pump controller, electronic oil pump, accumulator and instrument; The vehicle CAN is used to respond to the vehicle trigger signal and wake up the TCU control unit; The TCU control unit is used to enter and complete initialization after being awakened, and wake up the electronic oil pump controller to enter the oil filling mode; The electronic oil pump controller is used to control the operation of the electronic oil pump to charge the accumulator with oil; The accumulator is used to feed back to the PCU control unit after the pressure reaches the target pressure; The PCU control unit is used to send a ready signal to the instrument after determining that the ready condition is met; The vehicle use trigger signal is a key unlock signal, a keyless entry unlock signal, or an external trigger signal associated with a welcome mode, Bluetooth, or networking.

5. The hybrid transmission rapid oil filling and pressure building control system according to claim 4, characterized in that: After the electronic oil pump enters the oil filling mode, the oil pump motor is controlled to run and fill the oil at an electronic speed that meets NVH.

6. The hybrid transmission rapid oil filling and pressure building control system according to claim 4 or 5, characterized in that: The control system is designed for the application scenario where the vehicle is powered on for the first time after being turned off and parked for a period of time.

7. A vehicle, which is a hybrid vehicle, characterized in that the vehicle is equipped with the hybrid transmission rapid oil filling and pressure building control system according to any one of claims 4 to 6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the hybrid transmission rapid oil filling and pressure building control method as described in any one of claims 1 to 3.

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