An off-line test method for the electronic control component of a gearbox electronic oil pump

Abstract

The present invention discloses an end-of-line testing method for the electronic control assembly of a transmission electronic oil pump, comprising the following steps: 1) an end-of-line test of response time; and 2) an end-of-line test of the power performance of the electronic control assembly. This method is not only widely applicable to end-of-line testing of batch production of electronic control assemblies of transmission electronic oil pumps, but can also complete end-of-line testing of electronic control assemblies at extreme temperatures, thus ensuring the quality of the electronic control assemblies.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile electronically controlled hydraulics, in particular to an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission. Background Art

[0002] Automotive transmissions must ensure safety and functionality in all conditions, ensuring proper operation until the end of their life. The oil pump is a critical component, often considered the "heart" of the transmission. In recent years, driven by the increasing demands for intelligent and low-carbon vehicles, the demand for electronically controlled transmission pumps has grown, and electronic control has become increasingly complex. Each function cannot operate independently and must be optimized and coordinated with other modules to achieve enhanced performance. This trend is expected to become increasingly pronounced. Electronically controlled pumps primarily exist in transmissions in two forms: a pressure pump, which controls clutch engagement and shifting, and a lubrication pump, which provides cooling and lubrication for transmission components. The electronic control components of an electronically controlled transmission oil pump typically have a power rating of 100W to 400W. The motor is typically a brushless DC motor, with square wave or Field-of-Control (FOC) control methods. Communication methods typically include LIN, CAN, and CANFD.

[0003] Currently, there are no formal standards for testing methods for EOP (electronic oil pump) performance in China. Electronic control components are typically integrated into the pump head as subassemblies, so design performance testing of electronic control components must be based on company standards. Currently, the most widely used electronic control component tests are winding impedance testing, back-EMF testing, motor resistance testing, and motor demagnetization testing. However, these are performance verifications performed during the design phase and cannot be used for end-of-line testing of mass-produced products. Furthermore, end-of-line testing for EOP typically only involves two operating points at room temperature. However, under extreme temperature conditions, electronic control components have a higher probability of failure in response time and power performance, leading to significant quality issues. Summary of the Invention

[0004] The object of the present invention is to provide an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, comprising the following steps:

[0005] 1) Conduct offline response time test on the electronic control components of the transmission electronic oil pump.

[0006] 2) Off-line test of power performance of electronic control components.

[0007] Furthermore, the response time offline test includes the following steps:

[0008] 1) Set the duty cycle of the EOP controller under the controller feedback voltage or controller bus voltage.

[0009] 2) Use the EOP controller to control the motor so that the motor rotates from the first speed to the second speed without load, and the motor provides sufficient oil for the EOP.

[0010] 3) Record the response curve of the electronic control component of the transmission electronic oil pump, and mark the time from sending the message to executing the message.

[0011] Furthermore, the response time offline test is carried out at room temperature.

[0012] Furthermore, for an EOP controller with no pressure load and no reverse working condition, the first speed is 0 rpm, and the second speed is a preset working condition speed.

[0013] The preset operating speed refers to a speed calibrated in advance according to the required pressure or flow.

[0014] Furthermore, for an EOP controller with a pressure load and a reverse working condition, the first speed is the maximum forward speed, and the second speed is the maximum reverse speed.

[0015] Furthermore, the maximum forward rotation speed refers to the rotation speed calibrated at the highest pressure.

[0016] The maximum reverse rotation speed is set in the range of 300 rpm to 800 rpm.

[0017] Furthermore, the power performance offline test of the electronic control component includes the following steps:

[0018] 1) Calculate the motor torque T1 at the highest oil temperature.

[0019] 2) Based on the motor torque T1, complete the off-line performance test of the electronic control components at room temperature and minimum temperature.

[0020] Furthermore, the method for calculating the motor torque T1 includes the following steps:

[0021] 1) Using the EOP assembly, calibrate the parameters corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump at the highest oil temperature. The input power P1 of the electronic control component is as follows:

[0022] P1=U1I1 (1)

[0023] Where, I1 is the current corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and U1 is the voltage corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump.

[0024] 2) The calculation formula of the output power P1′ of the electronic control component is as follows:

[0025]

[0026] Where n1 is the speed corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and T1 is the motor torque.

[0027] 3) Based on the input power P1 and output power P1′, the calculation formula for the motor efficiency η1 is as follows:

[0028] P1=η1P1′ (3)

[0029] 4) The calculation formula of motor torque T1 is as follows:

[0030]

[0031] Furthermore, the off-line performance test of the electronic control component completed at room temperature includes the following steps:

[0032] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0033] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0034] 3) Read the corresponding controller bus current I2.

[0035] 4) Calculate the difference σ between the current I1 and the controller bus current I2. The calculation formula is as follows:

[0036] σ=|I1-I2| (5)

[0037] If the difference σ≤α, the off-line performance test of the electronic control component at room temperature is qualified.

[0038] If the difference σ>α, the off-line performance test of the electronic control component at room temperature fails.

[0039] Furthermore, the off-line performance test of the electronic control component completed at the lowest temperature includes the following steps:

[0040] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0041] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0042] 3) Read the corresponding controller bus current I3.

[0043] 4) Calculate the difference σ1 between the current I1 and the controller bus current I3. The calculation formula is as follows:

[0044] σ1=|I1-I3| (6)

[0045] If the difference σ1≤α, the off-line performance test of the electronic control component at the lowest temperature is qualified.

[0046] If the difference σ1>α, the off-line performance test of the electronic control component at the lowest temperature fails.

[0047] The technical effect of the present invention is unquestionable. The present invention proposes an off-line test method for the electronic control components of the transmission electronic control oil pump, which is not only widely applicable to the off-line test of batch products of the electronic control components of the transmission electronic control oil pump, but also can complete the off-line test of the electronic control components at extreme temperatures, thereby ensuring the quality of the electronic control components. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The figure is a flow chart of the off-line test method of the electronic control component of the transmission electronic oil pump. DETAILED DESCRIPTION

[0049] The present invention will be further described below with reference to the following examples, but it should not be understood that the scope of the present invention is limited to the following examples. Without departing from the above technical ideas of the present invention, various substitutions and modifications can be made according to common technical knowledge and customary means in the art, and all should be included in the scope of protection of the present invention.

[0050] Example 1:

[0051] See also Figure 1 This embodiment provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, comprising the following steps:

[0052] 1) Conduct offline response time test on the electronic control components of the transmission electronic oil pump.

[0053] 2) Off-line test of power performance of electronic control components.

[0054] The response time offline test includes the following steps:

[0055] 1) Set the duty cycle of the EOP controller (controller open-loop software program) at a controller feedback voltage of 12V or a controller bus voltage of 13.5V.

[0056] 2) Use the EOP controller to control the motor so that the motor rotates from the first speed to the second speed without load, and the motor provides sufficient oil for the EOP.

[0057] 3) Record the response curve of the electronic control component of the transmission electronic oil pump, and mark the time from sending the message to executing the message.

[0058] The response time offline test is carried out at room temperature.

[0059] For an EOP controller with no pressure load and no reverse working condition, the first speed is 0 rpm, and the second speed is a preset working condition speed.

[0060] The preset operating speed refers to a speed calibrated in advance according to the required pressure or flow.

[0061] For an EOP controller with a pressure load and a reverse working condition, the first speed is the maximum forward speed, and the second speed is the maximum reverse speed.

[0062] The maximum forward rotation speed refers to the rotation speed calibrated at the highest pressure.

[0063] The maximum reverse rotation speed is set in the range of 300 rpm to 800 rpm.

[0064] The power performance offline test of the electronic control component includes the following steps:

[0065] 1) Calculate the motor torque T1 at the maximum oil temperature (usually 120°C).

[0066] 2) Based on the motor torque T1, complete the off-line performance test of the electronic control components at room temperature and minimum temperature (usually -30℃).

[0067] The method for calculating the motor torque T1 includes the following steps:

[0068] 1) Using the EOP assembly, calibrate the parameters corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump at the highest oil temperature (calibrate the speed n1, current I1 and voltage U1 corresponding to the rated pressure of the pressure pump or the speed n1, current I1 and voltage U1 corresponding to the rated flow of the lubrication pump). The input power P1 of the electronic control component is as follows:

[0069] P1=U1I1 (1)

[0070] Where, I1 is the current corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and U1 is the voltage corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump.

[0071] 2) The calculation formula of the output power P1′ of the electronic control component is as follows:

[0072]

[0073] Where n1 is the speed corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and T1 is the motor torque.

[0074] 3) Based on the input power P1 and output power P1′, the calculation formula for the motor efficiency η1 is as follows:

[0075] P1=η1P1′ (3)

[0076] 4) The calculation formula of motor torque T1 is as follows:

[0077]

[0078] The off-line performance test of the electronic control component completed at room temperature includes the following steps:

[0079] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0080] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0081] 3) Read the corresponding controller bus current I2.

[0082] 4) Calculate the difference σ between the current I1 and the controller bus current I2. The calculation formula is as follows:

[0083] σ=|I1-I2| (5)

[0084] If the difference σ≤α, the off-line performance test of the electronic control component at room temperature is qualified.

[0085] If the difference σ>α, the off-line performance test of the electronic control component at room temperature fails.

[0086] The off-line performance test of the electronic control component completed at the lowest temperature includes the following steps:

[0087] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0088] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0089] 3) Read the corresponding controller bus current I3.

[0090] 4) Calculate the difference σ1 between the current I1 and the controller bus current I3. The calculation formula is as follows:

[0091] σ1=|I1-I3| (6)

[0092] If the difference σ1≤α, the off-line performance test of the electronic control component at the lowest temperature is qualified.

[0093] If the difference σ1>α, the off-line performance test of the electronic control component at the lowest temperature fails.

[0094] The present invention proposes an off-line test method for the electronic control components of the transmission electronic control oil pump. The method is not only widely applicable to the off-line test of batch products of the electronic control components of the transmission electronic control oil pump, but also can complete the off-line test of the electronic control components under extreme temperatures, thereby ensuring the quality of the electronic control components.

[0095] Example 2:

[0096] See also Figure 1 This embodiment provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, comprising the following steps:

[0097] 1) Conduct offline response time test on the electronic control components of the transmission electronic oil pump.

[0098] 2) Off-line test of power performance of electronic control components.

[0099] Example 3:

[0100] The present invention provides an offline test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to Example 2. The offline test of the response time includes the following steps:

[0101] 1) Set the duty cycle of the EOP controller (controller open-loop software program) at a controller feedback voltage of 12V or a controller bus voltage of 13.5V.

[0102] 2) Use the EOP controller to control the motor so that the motor rotates from the first speed to the second speed without load, and the motor provides sufficient oil for the EOP.

[0103] 3) Record the response curve of the electronic control component of the transmission electronic oil pump, and mark the time from sending the message to executing the message.

[0104] Example 4:

[0105] The present invention provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to Example 3. The off-line test of the response time is performed at room temperature.

[0106] Example 5:

[0107] The present invention provides an off-line test method for the electronic control component of the electronic oil pump of the transmission, mainly see Example 3. For the EOP controller with no pressure load and no reverse working condition, the first speed is 0 rpm and the second speed is the preset working condition speed.

[0108] The preset operating speed refers to a speed calibrated in advance according to the required pressure or flow.

[0109] Example 6:

[0110] The present invention provides an off-line test method for the electronic control component of the electronic oil pump of the transmission, mainly see Example 3. For an EOP controller with pressure load and reverse working conditions, the first speed is the maximum forward speed, and the second speed is the maximum reverse speed.

[0111] Example 7:

[0112] The present invention provides an off-line test method for the electronic control component of the electronically controlled oil pump of a transmission, mainly referring to Example 3, wherein the maximum forward rotation speed refers to the rotation speed calibrated with the highest pressure.

[0113] The maximum reverse rotation speed is set in the range of 300 rpm to 800 rpm.

[0114] Example 8:

[0115] The present invention provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to Example 2. The off-line test of the power performance of the electronically controlled component includes the following steps:

[0116] 1) Calculate the motor torque T1 at the maximum oil temperature (usually 120°C).

[0117] 2) Based on the motor torque T1, complete the off-line performance test of the electronic control components at room temperature and minimum temperature (usually -30℃).

[0118] Example 9:

[0119] The present invention provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to Example 8. The method for calculating the motor torque T1 includes the following steps:

[0120] 1) Using the EOP assembly, calibrate the parameters corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump at the highest oil temperature (calibrate the speed n1, current I1 and voltage U1 corresponding to the rated pressure of the pressure pump or the speed n1, current I1 and voltage U1 corresponding to the rated flow of the lubrication pump). The input power P1 of the electronic control component is as follows:

[0121] P1=U1I1 (1)

[0122] Where, I1 is the current corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and U1 is the voltage corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump.

[0123] 2) The calculation formula of the output power P1′ of the electronic control component is as follows:

[0124]

[0125] Where n1 is the speed corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and T1 is the motor torque.

[0126] 3) Based on the input power P1 and output power P1′, the calculation formula for the motor efficiency η1 is as follows:

[0127] P1=η1P1′ (3)

[0128] 4) The calculation formula of motor torque T1 is as follows:

[0129]

[0130] Example 10:

[0131] The present invention provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to any one of Embodiments 8 or 9. The off-line performance test of the electronically controlled component completed at room temperature comprises the following steps:

[0132] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0133] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0134] 3) Read the corresponding controller bus current I2.

[0135] 4) Calculate the difference σ between the current I1 and the controller bus current I2. The calculation formula is as follows:

[0136] σ=|I1-I2| (5)

[0137] If the difference σ≤α, the off-line performance test of the electronic control component at room temperature is qualified.

[0138] If the difference σ>α, the off-line performance test of the electronic control component at room temperature fails.

[0139] Example 11:

[0140] The present invention provides an off-line test method for an electronically controlled component of an electronically controlled oil pump of a transmission, mainly referring to any one of Embodiments 8 or 9. The off-line performance test of the electronically controlled component completed at the lowest temperature includes the following steps:

[0141] 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller.

[0142] 2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer.

[0143] 3) Read the corresponding controller bus current I3.

[0144] 4) Calculate the difference σ1 between the current I1 and the controller bus current I3. The calculation formula is as follows:

[0145] σ1=|I1-I3| (6)

[0146] If the difference σ1≤α, the off-line performance test of the electronic control component at the lowest temperature is qualified. If the difference σ1>α, the off-line performance test of the electronic control component at the lowest temperature is unqualified.

[0147] Example 12:

[0148] The purpose of this invention is to supplement the missing items in the EOP performance test, see Figure 1 This embodiment provides an off-line test method for electronic control components of electronically controlled oil pumps that can be generally used.

[0149] Offline response time test: At room temperature, using EOP controller hardware and motor, with a controller bus voltage of 12V or 13.5V, set the controller duty cycle (controller open-loop software program) so that the control motor rotates from 0 rpm at no load to the normal operating speed (pre-calibrated to the required pressure or flow rate). Record the response curve and mark the time from message issuance to message execution. For EOPs with pressure loads and reverse operating conditions, use the same method to set the speed from the maximum forward speed (the speed calibrated for the highest pressure) to the maximum reverse speed (usually 300-800 rpm). Record the response curve and mark the time from message issuance to message execution.

[0150] End-of-line test of power performance of electronic control components: Using the EOP assembly, at the highest oil temperature (usually 120°C), calibrate the speed n1, current I1 and voltage U1 corresponding to the rated pressure of the pressure pump (or the speed n1, current I1 and voltage U1 corresponding to the rated flow of the lubrication pump), using the formula:

[0151] Input power

[0152] P1=U1I1 (1)

[0153] Output power

[0154]

[0155] P1=η1P1′ (3)

[0156] Therefore, the motor torque can be obtained

[0157]

[0158] η1——Motor efficiency, which can be found through the motor design characteristic curve.

[0159] At room temperature, using EOP electronic control components, set the controller duty cycle at the controller bus voltage U1 to rotate the motor at n1. Apply torque T1 on the dynamometer and read the corresponding bus current I2. Comparing currents I1 and I2, the difference must not exceed 10%. Similarly, complete the end-of-line performance test of the electronic control components at the lowest temperature (usually -30°C).

Claims

1. A method for testing the electronic control components of a transmission electronic oil pump, characterized in that: The following steps are involved: 1) Conduct offline response time test on the electronic control components of the transmission electronic oil pump; 2) Off-line test of power performance of electronic control components, including the following steps: 2.1) Calculate the motor torque T1 at the highest oil temperature. The steps include: 2.1.1) Using the EOP assembly, calibrate the parameters corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump at the highest oil temperature. The input power P1 of the electronic control component is as follows: P1=U1I1 (1) Where, I1 is the current corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and U1 is the voltage corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump; 2.1.2) Output power P1 of electronic control components ′ The calculation formula is as follows: Where n1 is the speed corresponding to the rated pressure of the pressure pump or the rated flow of the lubrication pump, and T1 is the motor torque; 2.1.3) According to the input power P1 and output power P1 ′ , the calculation formula for motor efficiency η1 is as follows: P1=η1P1 ′ (3) 2.1.4) The calculation formula of motor torque T1 is as follows: 2.2) Complete the off-line performance test of the electronic control components at room temperature and minimum temperature based on the motor torque T1; The off-line performance test of the electronic control component completed at room temperature includes the following steps: 2.2.1.1) Set voltage U1 to the controller bus voltage, motor speed to n1, motor torque to T1, and set the duty cycle of the EOP controller; 2.2.1.2) The EOP's electronic control unit controls the motor to rotate at a speed n1 and applies torque T1 to the dynamometer; 2.2.1.3) Read the corresponding controller bus current I2; 2.2.1.4) Calculate the difference σ between the current I1 and the controller bus current I2. The calculation formula is as follows: σ=|I1-I2| (5) If the difference σ≤α, the off-line performance test of the electronic control component at room temperature is qualified; If the difference σ>α, the off-line performance test of the electronic control component at room temperature fails.

2. The off-line test method for the electronic control component of the transmission electronic oil pump according to claim 1, characterized in that: The response time offline test includes the following steps: 1) Set the duty cycle of the EOP controller under the controller feedback voltage or controller bus voltage; 2) Using the EOP controller to control the motor, the motor rotates from the first speed to the second speed without load, and the motor provides sufficient oil for the EOP; 3) Record the response curve of the electronic control component of the transmission electronic oil pump, and mark the time from sending the message to executing the message.

3. The off-line test method for the electronic control component of the electronically controlled oil pump of a transmission according to claim 2, characterized in that: The response time offline test is carried out at room temperature.

4. The off-line test method for the electronic control component of the transmission electronic oil pump according to claim 2, characterized in that: For an EOP controller with no pressure load and no reverse working condition, the first speed is 0 rpm and the second speed is a preset working condition speed; The preset operating speed refers to a speed calibrated in advance according to the required pressure or flow.

5. The off-line test method for the electronic control component of the electronically controlled oil pump of a transmission according to claim 2, characterized in that: For an EOP controller with a pressure load and a reverse working condition, the first speed is the maximum forward speed, and the second speed is the maximum reverse speed.

6. The off-line test method for the electronic control component of the electronically controlled oil pump of a transmission according to claim 5, characterized in that: The maximum forward speed refers to the speed calibrated at the highest pressure; The maximum reverse rotation speed is set in the range of 300 rpm to 800 rpm.

7. The off-line test method for the electronic control component of the electronically controlled oil pump of a transmission according to claim 1, characterized in that: The off-line performance test of the electronic control component completed at the lowest temperature includes the following steps: 1) Set the voltage U1 to the controller bus voltage, the motor speed to n1, the motor torque to T1, and the duty cycle of the EOP controller; 2) The EOP's electronic control unit controls the motor to rotate at a speed n1, applying torque T1 to the dynamometer; 3) Read the corresponding controller bus current I3; 4) Calculate the difference σ1 between the current I1 and the controller bus current I3. The calculation formula is as follows: σ1=|I1-I3| (6) If the difference σ1≤α, the off-line performance test of the electronic control component at the lowest temperature is qualified; If the difference σ1>α, the off-line performance test of the electronic control component at the lowest temperature fails.

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