Transmission oil pump operation control method and device

Abstract

The invention belongs to the technical field of automobiles, and particularly discloses a transmission oil pump operation control method and device.The control method comprises the steps that the vehicle driving state is obtained, vehicle modes are determined in real time according to the vehicle driving state, and the vehicle modes comprise the working mode, the idle time mode and the fault mode; corresponding flushing strategies are implemented on the oil pump according to different vehicle modes so as to restore the oil pumping capacity of the oil pump, and the specific flushing strategies are as follows: in the working mode, intermittent pulse flushing is performed on the oil pump for 2-4 times; in the idle time mode, the oil pump is subjected to continuous pulse flushing for 3-7 times; and in the failure mode, the oil pump is subjected to continuous pulse flushing for 10-20 times. Foreign matters in the oil pumping gear in the oil pump can be effectively flushed, and the fault occurrence probability that the oil pump is blocked by the foreign matters is reduced; and transmission assembly parts are prevented from being damaged due to lubrication failure caused by clamping stagnation failure of the oil pump, so that the normal operation life of the transmission is prolonged, and the maintenance and use cost of the transmission assembly is reduced.

Description

Technical Field

[0001] The present invention belongs to the field of automobile technology and relates to a transmission oil pump, and in particular to a transmission oil pump operation control method and device. Background Art

[0002] In the field of automotive transmission technology, particularly in new energy electric drive and hybrid vehicles, the transmission oil pump is a key component, fulfilling the crucial function of providing lubrication and cooling for the transmission assembly. By continuously pumping transmission oil, the oil pump ensures adequate lubrication and cooling of the transmission's internal components under high-speed and complex operating conditions, thereby maintaining normal transmission operation and extending its service life.

[0003] However, in actual operation, transmission oil pumps often face a thorny issue: foreign matter jamming. Due to the complex internal environment of the transmission, foreign matter such as metal debris, oil sludge, and dust can enter the oil pump along with the transmission fluid and gradually accumulate in key areas such as the pump gears. These foreign matter not only hinders the normal rotation of the oil pump gears, reducing the pump's pumping capacity, but can also cause the oil pump to jam. Once the oil pump jams, the lubrication and cooling systems within the transmission assembly are severely impacted, potentially leading to accelerated wear of transmission components due to lubrication failure, and even more serious mechanical failure.

[0004] Traditional transmission oil pump designs often lack effective self-recovery mechanisms. Once a pump fails due to foreign matter becoming stuck, manual repair or replacement is often required. This not only increases maintenance costs but can also delay vehicle operation due to lengthy repair times. Furthermore, the rapid development of the new energy vehicle market is placing higher demands on the performance and reliability of transmission oil pumps, making traditional designs unable to meet the demands of modern vehicles. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a transmission oil pump operation control method and device, which can effectively flush foreign matter from the oil pumping gear inside the oil pump, reduce the probability of the oil pump being stuck by foreign matter, and avoid lubrication failure and damage to transmission assembly parts due to oil pump sticking failure, thereby extending the service life of the transmission and reducing the maintenance and use costs of the transmission assembly.

[0006] The technical solution of the present invention is achieved as follows: A transmission oil pump operation control method specifically includes the following steps: (1) Obtaining a vehicle driving state and determining a vehicle mode in real time based on the vehicle driving state, wherein the vehicle mode includes a working mode, an idle mode, and a fault mode; (2) Implement corresponding flushing strategies for the oil pump according to different vehicle modes to restore the oil pump's pumping capacity. The specific flushing strategies are: in working mode, the oil pump is intermittently pulse-flushed 2-4 times; in idle mode, the oil pump is continuously pulse-flushed 3-7 times; in fault mode, the oil pump is continuously pulse-flushed 10-20 times.

[0007] Furthermore, when the vehicle speed is greater than V, the gear is set to D or R, and the NTC temperature of the transmission assembly motor is less than or equal to T, the vehicle is in working mode.

[0008] When the vehicle speed = 0Km / h, the gear is set to N or P, and the NTC temperature of the transmission assembly motor ≤ T, the vehicle is in idle mode.

[0009] When N0≤N1*95%, the vehicle is in failure mode.

[0010] Where: V is the creep speed of the vehicle; T is the temperature threshold; N0 is the actual working speed of the oil pump, and N1 is the requested working speed of the oil pump.

[0011] Furthermore, the pulse flushing is to set the oil pump driving speed to a periodic waveform control mode, and use the maximum positive and negative speed values ​​of the oil pump to form a periodic change to eliminate oil pump sticking.

[0012] Furthermore, the periodic waveform is one of a square wave, a triangle wave and a sawtooth wave.

[0013] Furthermore, the periodic waveform is a square wave pulse.

[0014] Furthermore, in step (2), in the working mode, the oil pump is subjected to two intermittent pulse flushing operations.

[0015] Furthermore, in step (2), in the idle mode, the oil pump is subjected to 5 consecutive pulse flushings.

[0016] Furthermore, in step (2), in the fault mode, the oil pump is subjected to 15 consecutive pulse flushings.

[0017] The present invention also provides a transmission oil pump operation control device, comprising: The vehicle status acquisition module is used to obtain the vehicle driving status.

[0018] The vehicle mode determination module is used to determine the vehicle mode in real time according to the vehicle driving status. The vehicle mode includes working mode, idle mode and fault mode.

[0019] The flushing strategy selection module is used to implement corresponding flushing strategies for the oil pump according to different vehicle modes.

[0020] The flushing strategy storage module is used to store the flushing strategies under different vehicle modes: in working mode, the oil pump is intermittently pulse-flushed 2-4 times; in idle mode, the oil pump is continuously pulse-flushed 3-7 times; in fault mode, the oil pump is continuously pulse-flushed 10-20 times.

[0021] The oil pump control module is used to control the oil pump according to different flushing strategies.

[0022] Compared with the prior art, the present invention has the following beneficial effects: The present invention performs intermittent pulse flushing on the oil pump during normal vehicle operation, and performs continuous pulse flushing on the oil pump when the vehicle is parked or when the oil pump is stuck by foreign matter and reports a speed difference fault, thereby achieving self-recovery of the oil pump's pumping capacity. During pulse flushing, the rotational direction and speed of the oil pump's pumping gear are controlled, and the oil pump's rotational direction is repeatedly and instantaneously reversed. The reciprocating pumping capacity of the oil pump generates a high pulse flow rate to flush foreign matter from the pumping gear within the oil pump, expelling the foreign matter from the oil pump, thereby reducing the probability of the oil pump being stuck by foreign matter. This prevents lubrication failure and damage to transmission assembly components caused by oil pump jamming, thereby extending the normal operating life of the transmission and reducing the maintenance and operating costs of the transmission assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 - Schematic diagram of the control flow for implementing the transmission oil pump operation control method.

[0024] Figure 2 -Schematic diagram of square wave pulse flushing control signal. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Due to the complex internal environment of the transmission, foreign matter such as metal debris, oil sludge, and dust may enter the oil pump along with the transmission oil and gradually accumulate in key parts such as the oil pump gear. These foreign matter will not only hinder the normal rotation of the oil pump gear, resulting in a decrease in the oil pumping capacity, but may also cause the oil pump to jam. Therefore, the present invention provides a transmission oil pump operation control method, see Figure 1 , specifically including: (1) The transmission oil pump controller issues a wake-up command to initialize the oil pump start-up and sends a target speed command to the oil pump. It then obtains the vehicle driving status and determines the vehicle mode in real time based on the vehicle driving status. The vehicle mode is divided into three modes: working mode, idle mode, and fault mode.

[0027] (2) Implement corresponding flushing strategies for the oil pump according to different vehicle modes to restore the oil pump's pumping capacity.

[0028] a. When the vehicle is in working mode, the vehicle speed, gear position and temperature threshold are used as judgment conditions to determine whether to enter the oil pump flushing function.

[0029] The oil pump flushing state is activated when the vehicle is in normal driving mode, the vehicle speed is greater than the creep speed, the gear is set to D or R, and the transmission assembly motor NTC temperature is less than or equal to the temperature threshold. Otherwise, it is not established. After the oil pump enters the flushing state, the oil pump is intermittently pulse-flushed 2-4 times, with the interval set according to needs.

[0030] The vehicle's creep speed is typically 3-8 km / h, varying depending on the vehicle model and driving mode. The specific creep speed is determined based on the vehicle model and driving mode. In this embodiment, the creep speed is 5 km / h. The NTC temperature threshold for the transmission assembly motor varies across different vehicle models; in this embodiment, the threshold is 100°C.

[0031] In this embodiment, the oil pump flushing function counter n=2, which means that two intermittent pulse flushes are performed, also two flushing cycles, where one flushing cycle consists of a waveform change with one positive speed and one negative speed maximum transition, and two cycles constitute two cycles, ending and exiting upon completion. In this embodiment, the oil pump flushing function is performed once every 15 minutes.

[0032] b. When the vehicle is in idle mode, the vehicle speed, gear position and temperature threshold are used as judgment conditions to determine whether to enter the oil pump flushing function.

[0033] When the vehicle is in stop mode, the speed is 0 km / h, the gear is set to N or P, and the NTC temperature of the transmission motor is ≤ 100°C, the oil pump flushing state is activated. Otherwise, it is not established. After the oil pump enters the flushing state, the oil pump is continuously pulse-flushed 3-7 times.

[0034] In this embodiment, the counter n of the oil pump flushing function is 5, that is, 5 continuous pulse flushings are performed, which are also 5 flushing cycles, where 1 flushing cycle is a waveform change of 1 positive speed and 1 negative speed maximum conversion, 5 is 5 cycles, and the system ends and exits after completion.

[0035] c. When the vehicle is in fault mode, the fuel pump status is judged as a condition to confirm whether to enter the fuel pump flushing function.

[0036] When the vehicle is in fault mode, the fault mode is determined by the fuel pump status. The judgment value is: fuel pump speed Nactual ≤ Nrequest * 95%, where Nactual refers to the actual operating speed of the fuel pump and Nrequest refers to the requested operating speed of the fuel pump. When the actual operating speed of the fuel pump is less than 95% of the requested operating speed, it is determined to have entered the stuck fault mode and the fuel pump flushing state is activated. Otherwise, it is not established. After the fuel pump enters the flushing state, it is continuously pulse-flushed 10-20 times.

[0037] In this embodiment, in the fault mode, the counter n of the oil pump flushing function is 15, that is, 15 continuous pulse flushings are performed, which are also 15 flushing cycles, wherein one flushing cycle is a waveform change of one positive speed and one negative speed maximum conversion, 15 of which are 15 cycles, and the system ends and exits after completion.

[0038] In practice, pulse flushing involves setting the oil pump drive speed to a square wave pulse control mode, utilizing the periodic variation of the positive and negative speed maximums to flush and eliminate oil pump stagnation. While the square wave pulse control mode can be used to periodically vary the positive and negative speed maximums, conventional periodic waveforms such as triangular waves and sawtooth waves can also be used to control the positive and negative speed signals. Figure 2 This is a schematic diagram of the square wave pulse flushing control signal, specifically: T1: Forward speed rapid rise time: 100ms; speed peak: 0→+4500r / min; T2: Forward speed peak +4500r / min, duration: 2s; T3: Rapid conversion from forward speed peak to reverse speed peak: +4500r / min→-4500r / min; conversion time: 250ms; T4: Reverse speed peak value -4500r / min, duration: 2s; T5: Reverse speed rapid drop time: 100ms; speed peak: -4500r / min→0; The waveform changes of T1 to T5 above complete one positive speed and one negative speed maximum conversion, which is recorded as one flushing cycle T0. Two flushing cycles are the continuous repetition of T0 waveform changes, and the same is true for 5 and 10 flushing cycles.

[0039] The present invention also provides a transmission oil pump operation control device, comprising: Vehicle status acquisition module, used to obtain the vehicle driving status; A vehicle mode determination module is used to determine the vehicle mode in real time according to the vehicle driving state, wherein the vehicle mode includes working mode, idle mode and fault mode; A flushing strategy selection module is used to implement corresponding flushing strategies for the oil pump according to different vehicle modes; Flushing strategy storage module, used to store flushing strategies under different vehicle modes: in working mode, the oil pump is subjected to 2-4 intermittent pulse flushing; in idle mode, the oil pump is subjected to 3-7 continuous pulse flushing; in fault mode, the oil pump is subjected to 10-20 continuous pulse flushing; The oil pump control module is used to control the oil pump according to different flushing strategies.

[0040] Finally, it should be noted that the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations and modifications can be made based on the above description. It is not possible to enumerate all embodiments here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims

1. A transmission oil pump operation control method, characterized in that: The specific steps include: (1) Obtaining a vehicle driving state and determining a vehicle mode in real time based on the vehicle driving state, wherein the vehicle mode includes a working mode, an idle mode, and a fault mode; (2) Implement corresponding flushing strategies for the oil pump according to different vehicle modes to restore the oil pump's pumping capacity. The specific flushing strategies are: in working mode, the oil pump is intermittently pulse-flushed 2-4 times; in idle mode, the oil pump is continuously pulse-flushed 3-7 times; in fault mode, the oil pump is continuously pulse-flushed 10-20 times.

2. A transmission oil pump operation control method according to claim 1, characterized in that: When the vehicle speed is greater than V, the gear is set to D or R, and the NTC temperature of the transmission assembly motor is less than or equal to T, the vehicle is in working mode; When the vehicle speed = 0Km / h, the gear is set to N gear or P gear, and the transmission assembly motor NTC temperature ≤ T, the vehicle is in idle mode; When N0≤N1*95%, the vehicle is in failure mode; Where: V is the creep speed of the vehicle; T is the temperature threshold; N0 is the actual working speed of the oil pump, and N1 is the requested working speed of the oil pump.

3. A transmission oil pump operation control method according to claim 1 or 2, characterized in that: The pulse flushing is to set the oil pump driving speed to a periodic waveform control mode, and use the maximum positive and negative speed values ​​of the oil pump to form a periodic change to eliminate oil pump jamming.

4. The transmission oil pump operation control method according to claim 3, characterized in that: The periodic waveform is one of a square wave, a triangle wave and a sawtooth wave.

5. The transmission oil pump operation control method according to claim 1, characterized in that: The periodic waveform is a square wave pulse.

6. The transmission oil pump operation control method according to claim 1, characterized in that: In step (2), in the working mode, the oil pump is subjected to two intermittent pulse flushing operations.

7. The transmission oil pump operation control method according to claim 1, characterized in that: In step (2), in idle mode, the oil pump is continuously pulse-flushed five times.

8. The transmission oil pump operation control method according to claim 1, characterized in that: In step (2), in the fault mode, the oil pump is continuously pulse-flushed 15 times.

9. A transmission oil pump operation control device, characterized in that: include: Vehicle status acquisition module, used to obtain the vehicle driving status; A vehicle mode determination module is used to determine the vehicle mode in real time according to the vehicle driving state, wherein the vehicle mode includes working mode, idle mode and fault mode; A flushing strategy selection module is used to implement corresponding flushing strategies for the oil pump according to different vehicle modes; Flushing strategy storage module, used to store flushing strategies under different vehicle modes: in working mode, the oil pump is subjected to 2-4 intermittent pulse flushing; in idle mode, the oil pump is subjected to 3-7 continuous pulse flushing; in fault mode, the oil pump is subjected to 10-20 continuous pulse flushing; The oil pump control module is used to control the oil pump according to different flushing strategies.

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