Valve Clearance Adjustment Process Method, Device, Vehicle and Storage Medium

Abstract

The present invention relates to the technical field of engines, and particularly to a valve clearance adjustment process method, device, vehicle and storage medium. The method determines whether the crankshaft phase angle of each cylinder is within the continuous opening angle range of the valve after each engine rotation by turning the engine twice, and determines whether to adjust the valve clearance of the corresponding cylinder according to the judgment result; statistics are made on the adjustment of the intake valves and exhaust valves of each cylinder. If the intake valves and exhaust valves of each cylinder are adjusted at least once, the valve clearance adjustment process is derived; otherwise, an error is reported. It is necessary to judge whether the crankshaft phase angle is within the continuous opening angle range of the valve during each clearance adjustment, so as to judge whether the valve is open or closed, and determine whether the valve clearance can be adjusted according to the opening and closing states of the valve, so as to avoid adjusting the valve intake when the valve is open, which affects the subsequent operation of the valve.

Description

Technical Field

[0001] The present invention relates to the field of engine technology, and in particular to a valve clearance adjustment process method, a device, a vehicle and a storage medium. Background Art

[0002] When the engine is working, the parts of the valve train (such as valves, tappets and push rods, etc.) expand due to the increase in temperature. If there is no gap or too small gap between the valve and its transmission parts in the cold state, the thermal expansion of the valve and its transmission parts will inevitably cause the valve to close loosely in the hot state, causing the engine to leak during the compression and power strokes, thereby reducing the engine power and even making it difficult to start in severe cases. In order to eliminate this phenomenon, appropriate valve clearance is usually left to compensate for the expansion of the valve after heating.

[0003] The conventional method for formulating the valve clearance adjustment process is to first draw the power sequence diagram of the engine model, and then determine the open and closed states of the intake and exhaust valves of each cylinder based on the valve timing and personal experience, and then determine when to adjust the intake and exhaust valves of each cylinder. However, since the valve clearance adjustment process is manually formulated, it is impossible to accurately determine the valve open and closed states, which is prone to errors due to personal experience, negligence, etc., and the efficiency is low.

[0004] Therefore, a valve clearance adjustment process method is urgently needed to solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a valve clearance adjustment process method, device, vehicle and storage medium, which can accurately determine the opening and closing status of the valve and improve work efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] The valve clearance adjustment process comprises the following steps:

[0008] Obtaining a continuous opening angle interval of the valve, wherein the continuous opening angle interval of the valve includes a continuous opening angle interval [α1, α2] of the intake valve and a continuous opening angle interval [α3, α4] of the exhaust valve;

[0009] After the first cranking, the crankshaft phase angle Ai of each cylinder is obtained, where i = 1, 2, ..., n, where n is the number of cylinders;

[0010] Determine whether the crankshaft phase angle Ai of each cylinder is within the continuous valve opening angle range, and determine whether to adjust the valve clearance of the corresponding cylinder according to the determination result;

[0011] After the second cranking, the crankshaft phase angle Bi of each cylinder is obtained;

[0012] Judge whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result;

[0013] Record the number of times of valve clearance adjustment for the intake valve and exhaust valve of each cylinder according to the judgment result; if the intake valve and exhaust valve of each cylinder have both been adjusted at least once, export the valve clearance adjustment process; otherwise, report an error.

[0014] As a preferred technical solution of the above valve clearance adjustment process method, judging whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle range of the valve, and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result includes:

[0015] If the crankshaft phase angle Ai corresponding to the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, the exhaust valve corresponding to this crankshaft phase angle Ai is not adjusted; if the crankshaft phase angle Ai corresponding to the current cylinder is within the continuous opening angle range of the corresponding intake valve, the intake valve corresponding to this crankshaft phase angle Ai is not adjusted; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, obtain the absolute values of the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the intake valve opening angle range, and judge the magnitude between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the intake valve clearance; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, obtain the absolute values of the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the exhaust valve opening angle range, and judge the magnitude between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the exhaust valve clearance;

[0016] Among them, the absolute values of the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the intake valve opening angle range are |Ai-α1| and |Ai-α2|;

[0017] The absolute values of the crankshaft phase angle Ai and the two endpoints of the exhaust valve opening angle range corresponding to the current cylinder are |Ai-α3| and |Ai-α4|.

[0018] As a preferred technical solution of the above valve clearance adjustment process method, judging whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result includes:

[0019] If the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, the exhaust valve corresponding to the crankshaft phase angle Bi is not adjusted; if the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding intake valve, the intake valve corresponding to the crankshaft phase angle Bi is not adjusted; if the crankshaft phase angle Bi of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, the absolute values of the crankshaft phase angle Bi corresponding to the current cylinder and the two end points of the intake valve opening angle range are obtained, and the magnitudes of the absolute values of the differences are judged with respect to the first preset angle. If the absolute values of all the differences are greater than or equal to the first preset angle, the intake valve clearance is adjusted; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, the absolute values of the crankshaft phase angle Ai corresponding to the current cylinder and the two end points of the exhaust valve opening angle range are obtained, and the magnitudes of the absolute values of the differences are judged with respect to the first preset angle. If the absolute values of all the differences are greater than or equal to the first preset angle, the exhaust valve clearance is adjusted;

[0020] Among them, the absolute values |Bi - α1| and |Bi - α2| of the crankshaft phase angle Bi corresponding to the current cylinder and the two end points of the intake valve opening angle range;

[0021] The absolute values |Bi - α3| and |Bi - α4| of the crankshaft phase angle Bi and the two end points of the exhaust valve opening angle range corresponding to the current cylinder.

[0022] As a preferred technical solution of the above valve clearance adjustment process method, obtaining the crankshaft phase angle Ai of each cylinder and the continuous opening angle range of the valve includes:

[0023] Obtain the theoretical valve timing;

[0024] According to the theoretical valve timing, calculate the angle α1 corresponding to the intake valve opening moment, the angle α2 corresponding to the intake valve closing moment, the angle α3 corresponding to the exhaust valve opening moment, and the angle α4 corresponding to the exhaust valve closing moment;

[0025] Obtain the ignition sequence of the engine, and according to the ignition sequence of the engine, obtain the firing interval angle βi of the camshaft corresponding to each cylinder and the compression top dead center of the reference cylinder. Calculate the crankshaft phase angle Ai of each cylinder based on the reference cylinder as Ai = 720 - 2 * βi.

[0026] As a preferred technical solution of the above valve clearance adjustment process method, obtaining the crankshaft phase angle Bi of each cylinder after the second engine rotation includes:

[0027] Obtain the crankshaft phase angle Ax of the x-th cylinder where neither the intake valve clearance nor the exhaust valve clearance is adjusted. If Ax can be divided evenly by the second preset angle W, then the x-th cylinder is the reference cylinder, and the angle by which the crankshaft needs to be rotated counterclockwise for the second crankshaft rotation is Ax. If Ai + Ax > 720°, then the crankshaft phase angle Bi of each cylinder is Bi = Ai + Ax - 720°. If Ai + Ax ≤ 720°, then the crankshaft phase angle Bi of each cylinder is Bi = Ai + Ax.

[0028] As a preferred technical solution of the above valve clearance adjustment process method, the first preset angle is 720° / n.

[0029] As a preferred technical solution of the above valve clearance adjustment process method, the error reporting includes a screen pop-up window and a sound prompt.

[0030] The present invention also provides a valve clearance adjustment process device, including:

[0031] A first acquisition module, configured to obtain the continuous opening angle interval of the valve, and the continuous opening angle interval of the valve includes the continuous opening angle interval [α1, α2] of the intake valve and the continuous opening angle interval [α3, α4] of the exhaust valve;

[0032] A second acquisition module, configured to obtain the crankshaft phase angle Ai of each cylinder, where i = 1, 2,..., n, and n is the number of cylinders;

[0033] A first judgment and adjustment module, configured to judge whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result;

[0034] A third acquisition module, configured to obtain the crankshaft phase angle Bi of each cylinder after the second crankshaft rotation;

[0035] A second judgment and adjustment module, configured to judge whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result;

[0036] A statistics and prompt module, configured to record the number of times of valve clearance adjustment for the intake valve and the exhaust valve of each cylinder according to the judgment result. If the intake valve and the exhaust valve of each cylinder have both been adjusted at least once, then export the valve clearance adjustment process; otherwise, report an error.

[0037] The present invention also discloses a vehicle, which includes:

[0038] Valves, configured to input air into the engine and discharge the burned exhaust gas;

[0039] A memory, configured to store executable instructions;

[0040] A controller, when executing executable instructions stored in a memory, implements the method described in any of the above solutions.

[0041] The present invention also discloses a storage medium, on which a computer program is stored. When the program is executed by a controller, a vehicle implements the valve clearance adjustment process method described in any of the above solutions.

[0042] Advantages of the present invention:

[0043] The method and device provided by the present invention can reduce the calculation intensity through two valve clearance adjustments. In this method, each time the clearance of each cylinder is adjusted, it is necessary to determine whether the crankshaft phase angle corresponding to each cylinder is within the continuous opening angle range of the valve, so as to accurately judge whether the valve is open or closed. Then, according to the opening and closing states of the valve, it is determined whether the valve clearance can be adjusted. Compared with the prior art, this can avoid adjusting the valve intake when the valve is open and avoid errors in valve clearance adjustment. Especially for engines with a large number of cylinders, it can greatly avoid errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0045] Figure 1 It is a flowchart of the valve clearance adjustment process method provided by an embodiment of the present invention;

[0046] Figure 2 It is a flowchart of the valve clearance adjustment process after the first engine rotation;

[0047] Figure 3 It is a flowchart of the valve clearance adjustment process after the second engine rotation provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] The following will further elaborate on the present invention in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0049] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0051] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] The present invention provides a valve clearance adjustment process method, which can accurately judge the opening and closing states of the valves and improve the working efficiency.

[0053] As Figure 1 shown, the valve clearance adjustment process method includes the following steps:

[0054] S101. Obtain the continuous opening angle intervals of the valves. The continuous opening angle intervals of the valves include the continuous opening angle interval [α1, α2] of the intake valve and the continuous opening angle interval [α3, α4] of the exhaust valve;

[0055] The continuous opening angle intervals of the valves can be obtained according to the theoretical valve timing values. After obtaining the theoretical valve timing values, calculate the angle α1 corresponding to the opening moment of the intake valve, the angle α2 corresponding to the closing moment of the intake valve, the angle α3 corresponding to the opening moment of the exhaust valve, and the angle α4 corresponding to the closing moment of the exhaust valve according to the theoretical valve timing; the continuous opening angle interval of the intake valve is [α1, α2], and the continuous opening angle interval of the exhaust valve is [α3, α4].

[0056] S102. After the first engine turning, obtain the crankshaft phase angles Ai of each cylinder, where i = 1, 2, ……, n, and n is the number of cylinders;

[0057] The crankshaft phase angles Ai of each cylinder are calculated based on the ignition sequence, the top dead center of compression of the reference cylinder specified in the camshaft drawing, and the crankshaft ignition delay angle of each cylinder. The crankshaft ignition delay angle of each cylinder is obtained based on the ignition interval angle βi of the camshaft, where the crankshaft ignition delay angle is -2*βi. The crankshaft phase angles Ai of each cylinder are different, while the continuous opening angle intervals [α1, α2] of the intake valves of each cylinder are the same, and the continuous opening angle intervals [α3, α4] of the exhaust valves of each cylinder are also the same.

[0058] S103. Determine whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result;

[0059] S104. After the second engine turning, obtain the crankshaft phase angles Bi of each cylinder;

[0060] For the second clearance adjustment, it needs to be carried out after the first clearance adjustment is completed. Before the adjustment, it is necessary to determine the reference cylinder after the first clearance adjustment is completed. Since the top dead center of compression changes after the adjustment is completed, the reference cylinder also changes. Therefore, it is necessary to obtain the crankshaft phase angles Bi of the corresponding cylinders after engine turning before the judgment.

[0061] S105. Determine whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result;

[0062] S106. Record the number of times of valve clearance adjustment for the intake valves and exhaust valves of each cylinder according to the judgment result. If the intake valves and exhaust valves of each cylinder have obtained at least one adjustment, export the valve clearance adjustment process; otherwise, report an error.

[0063] That is, after the above two clearance adjustments, count the adjustments of the intake valves and exhaust valves of each cylinder. When the intake valves and exhaust valves of each rod have obtained at least one adjustment, the valve clearance adjustment process is exported, and then the subsequent process is carried out. When not all the intake valves and exhaust valves of all cylinders are adjusted after the two clearance adjustments, report an error.

[0064] The valve clearance adjustment process includes which cylinders' intake valves or exhaust valves can adjust the valve clearance during the first adjustment, the angle of counterclockwise engine turning required after the first adjustment is completed, and which cylinders' intake valves or exhaust valves can adjust the valve clearance during the second adjustment.

[0065] The method provided by the present invention can reduce the calculation intensity through two valve clearance adjustments. In this method, for each cylinder, it is necessary to determine whether the corresponding crankshaft phase angle of each cylinder is within the continuous opening angle range of the valve each time the clearance is adjusted, so as to accurately judge whether the valve is open or closed, and then determine whether the valve clearance can be adjusted according to the opening and closing states of the valve. Compared with the prior art, this can avoid adjusting the valve intake when the valve is open and avoid errors in valve clearance adjustment. Especially for engines with a large number of cylinders, errors can be avoided.

[0066] This method can also avoid errors in the valve clearance adjustment process caused by human negligence. Since the valve clearance adjustment process is designed with a short manual operation time and a fast calculation time, compared with the prior art, it improves the efficiency of valve clearance adjustment and reduces the labor intensity.

[0067] Specifically, in this embodiment, determining whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle range of the valve and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result specifically includes:

[0068] If the crankshaft phase angle Ai of the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, and the exhaust valve is in the open state at this time, the exhaust valve corresponding to the crankshaft phase angle Ai is not adjusted; if the crankshaft phase angle Ai of the current cylinder is within the continuous opening angle range of the corresponding intake valve, and the intake valve is in the open state at this time, the intake valve corresponding to the crankshaft phase angle Ai is not adjusted.

[0069] If the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, it indicates that the intake valve is in the closed state at this time, and the clearance can be adjusted at this time. Then, obtain the absolute values of the difference between the crankshaft phase angle Ai of the current cylinder and the two end points of the intake valve opening angle range, and judge the magnitude between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the intake valve clearance; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, it indicates that the exhaust valve is in the closed state at this time, and the clearance can be adjusted at this time. Then, obtain the absolute values of the difference between the crankshaft phase angle Ai of the current cylinder and the two end points of the exhaust valve opening angle range, and judge the magnitude between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the exhaust valve clearance;.

[0070] Among them, the first preset angle is 720° / n. This can avoid selecting the cylinder closest to the opening of the intake valve or exhaust valve for adjustment.

[0071] Among them, the absolute values |Ai-α1| and |Ai-α2| of the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the intake valve opening angle interval;

[0072] The absolute values |Ai-α3| and |Ai-α4| of the crankshaft phase angle Ai and the two endpoints of the exhaust valve opening angle interval corresponding to the current cylinder.

[0073] The method provided by the present invention can be applied to the valve clearance adjustment of engines of various models. When most models of engines use the transmission method to adjust the valve clearance, generally, the engine needs to be turned over more than twice. However, by using this method, on the basis of meeting the first preset angle (i.e., the safety margin), the number of times of turning over the engine can be controlled to twice, greatly reducing the time required for valve clearance adjustment and improving the efficiency of valve clearance adjustment.

[0074] As Figure 2 shown, after the first turning over of the engine, the valve clearance adjustment process includes the following steps:

[0075] S201. Input the number of cylinders of the engine;

[0076] S202. Input the engine body form, which is L for in-line and V for V-type;

[0077] S203. Obtain the continuous opening angle intervals [α1,α2] of the intake valves of each cylinder and the continuous opening angle intervals [α3,α4] of the exhaust valves;

[0078] S204. After the first turning over of the engine, obtain the crankshaft phase angle Ai of each cylinder and simultaneously execute steps S205 and S212;

[0079] S205. Determine whether the crankshaft phase angle Ai falls within the continuous opening angle interval [α1,α2] of the intake valve. If so, execute step S206; if not, execute step S207;

[0080] S206. The intake valve is in the open state, no adjustment is required, and the next cylinder is judged;

[0081] S207. The intake valve is in the closed state, execute step S208;

[0082] S208. Obtain the absolute values |Ai-α1| and |Ai-α2| of the difference between the current crankshaft phase angle Ai and the two endpoints of the intake valve continuous opening angle interval where the crankshaft phase angle Ai is not located;

[0083] S209. Compare whether both |Ai-α1| and |Ai-α2| are greater than the first preset angle. If so, execute step S210; if not, judge the next cylinder;

[0084] S210. The intake valve of this cylinder can adjust the valve clearance;

[0085] S211. The intake valve of this cylinder does not adjust the valve clearance, and the next cylinder is judged.

[0086] S212. Judge whether the crankshaft phase angle Ai falls within the continuous opening angle range [α3, α4] of the exhaust valve. If so, execute step S213; if not, execute step S214.

[0087] S213. The exhaust valve is in the open state and cannot be adjusted. The next cylinder is judged.

[0088] S214. The exhaust valve is in the closed state, and step S215 is executed.

[0089] S215. Obtain the absolute values |Ai - α3| and |Ai - α4| of the differences between the current crankshaft phase angle Ai and the two endpoints of the continuous opening angle range of the exhaust valve where this crankshaft phase angle Ai is not located.

[0090] S216. Compare whether both |Ai - α3| and |Ai - α4| are greater than the first preset angle. If so, execute step S217; if not, execute step S218.

[0091] S217. The exhaust valve of this cylinder can adjust the valve clearance.

[0092] S218. The exhaust valve of this cylinder does not adjust the valve clearance, and the next cylinder is judged.

[0093] S219. After all cylinders have been judged, record the adjustment conditions of the intake valves and exhaust valves of each cylinder.

[0094] Specifically, the crankshaft phase angle Bi is obtained through the following method:

[0095] Obtain the crankshaft phase angle Ax of the xth cylinder where neither the intake valve clearance nor the exhaust valve clearance has been adjusted. If Ax can be divided evenly by the second preset angle W, then the xth cylinder is the reference cylinder, and the angle by which the crankshaft needs to be rotated counterclockwise for the second crankshaft rotation is Ax. If Ai + Ax > 720°, then the crankshaft phase angle Bi of each cylinder = Ai + Ax - 720°; if Ai + Ax ≤ 720°, then the crankshaft phase angle Bi of each cylinder = Ai + Ax.

[0096] Specifically, in this embodiment, judging whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result specifically includes:

[0097] If the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, the exhaust valve corresponding to the crankshaft phase angle Bi is not adjusted; at this time, it indicates that the exhaust valve is in the open state, and the clearance adjustment cannot be performed at this time. If the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding intake valve, the intake valve corresponding to the crankshaft phase angle Bi is not adjusted; at this time, it indicates that the intake valve is in the open state, and the clearance adjustment cannot be performed at this time.

[0098] If the crankshaft phase angle Bi of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, obtain the absolute values of the crankshaft phase angle Bi corresponding to the current cylinder and the two end points of the intake valve opening angle range, and judge the magnitudes between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the intake valve clearance; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, obtain the absolute values of the crankshaft phase angle Ai corresponding to the current cylinder and the two end points of the exhaust valve opening angle range, and judge the magnitudes between the absolute values of each difference and the first preset angle. If the absolute values of each difference are all greater than or equal to the first preset angle, adjust the exhaust valve clearance.

[0099] Among them, the absolute values |Bi - α1| and |Bi - α2| of the crankshaft phase angle Bi corresponding to the current cylinder and the two end points of the intake valve opening angle range;

[0100] The absolute values |Bi - α3| and |Bi - α4| of the crankshaft phase angle Bi and the two end points of the exhaust valve opening angle range corresponding to the current cylinder.

[0101] It should be noted that in this embodiment, the absolute values of the differences between the crankshaft phase angle Bi and the two end points of the valve continuous opening angle range where the crankshaft phase angle Bi is not located include: the absolute values of the differences between the crankshaft phase angle Bi and the two end points of the intake valve continuous opening angle range where the crankshaft phase angle Bi is not located are |Bi - α1| and |Bi - α2|;

[0102] The absolute values of the differences between the crankshaft phase angle Bi and the two end points of the exhaust valve continuous opening angle range where the crankshaft phase angle Bi is not located are |Bi - α3| and |Bi - α4|.

[0103] Specifically, obtaining the crankshaft phase angle Ai of each cylinder and the continuous opening angle range of the valve includes:

[0104] Obtain the theoretical valve timing;

[0105] Calculate the angle α1 corresponding to the intake valve opening moment, the angle α2 corresponding to the intake valve closing moment, the angle α3 corresponding to the exhaust valve opening moment, and the angle α4 corresponding to the exhaust valve closing moment according to the theoretical valve timing;

[0106] Obtain the ignition sequence of the engine, and obtain the firing interval angle βi of the camshaft corresponding to each cylinder and the compression top dead center of the reference cylinder according to the ignition sequence of the engine. Calculate the crankshaft phase angle Ai of each cylinder based on the reference cylinder as Ai = 720 - 2 * βi according to the obtained firing interval angle βi of the camshaft corresponding to each cylinder.

[0107] The continuous opening angle interval [α1, α2] of the intake valve and the continuous opening angle interval [α3, α4] of the exhaust valve are obtained before turning the engine by hand. Therefore, the continuous opening angle intervals of the intake valve and the exhaust valve corresponding to the two times of turning the engine by hand are the same.

[0108] As Figure 3 shown, the valve clearance adjustment process after the second turning of the engine by hand includes the following steps:

[0109] S301. After the second turning of the engine by hand, obtain the crankshaft phase angle Bi of each cylinder, and simultaneously execute steps S302 and S309;

[0110] S302. Determine whether the crankshaft phase angle Bi falls within the continuous opening angle interval [α1, α2] of the intake valve. If so, execute step S303; if not, execute step S304;

[0111] S303. The intake valve is in the open state and cannot be adjusted. Determine the next cylinder;

[0112] S304. The intake valve is in the closed state, and execute step S305;

[0113] S305. Obtain the absolute values |Bi - α1| and |Bi - α2| of the differences between the current crankshaft phase angle Bi and the two endpoints of the continuous opening angle interval of the intake valve where this crankshaft phase angle Ai is not located;

[0114] S306. Compare whether both |Bi - α1| and |Bi - α2| are greater than the first preset angle. If so, execute step S307; if not, determine the next cylinder;

[0115] S307. The intake valve of this cylinder can adjust the valve clearance;

[0116] S308. The intake valve of this cylinder does not adjust the valve clearance. Determine the next cylinder;

[0117] S309. Determine whether the crankshaft phase angle Bi falls within the continuous opening angle interval [α3, α4] of the exhaust valve. If so, execute step S310; if not, execute step S311;

[0118] S310. The exhaust valve is in the open state and cannot be adjusted. Determine the next cylinder;

[0119] S311. The exhaust valve is in the closed state, and step S312 is executed;

[0120] S312. Obtain the absolute values |Bi - α3| and |Bi - α4| of the difference between the current crankshaft phase angle Bi and the two end points of the exhaust valve continuous opening angle interval where the crankshaft phase angle Bi is not located;

[0121] S313. Compare whether both |Bi - α3| and |Bi - α4| are greater than the first preset angle; if so, execute step S314, if not, execute step S315;

[0122] S314. The exhaust valve of this cylinder can adjust the valve clearance;

[0123] S315. The exhaust valve of this cylinder does not adjust the valve clearance, and the next cylinder is judged;

[0124] S316. Until all cylinders are judged, record the adjustment conditions of the intake valves and exhaust valves of each cylinder;

[0125] S317. After two valve clearance adjustments, judge whether the intake valves and exhaust valves of each cylinder have been adjusted at least once; if so, execute step S318; if not, execute step S319;

[0126] S318. Export the valve clearance adjustment process;

[0127] S319. Report an error.

[0128] It should be noted that the error reporting includes a screen pop-up window and a sound prompt. In this embodiment, it can be specifically obtained through the screen pop-up window. Exemplarily, the screen pop-up window can display that there is a situation where the Y valve of the X cylinder has not been adjusted twice, and the development program is abnormal. Please check.

[0129] In this embodiment, a valve clearance adjustment process device is also provided. The device includes a first acquisition module, a second acquisition module, a first judgment and adjustment module, a third acquisition module, a second judgment and adjustment module, and a statistics and prompt module. Through two valve clearance adjustments, the calculation intensity can be reduced. In this method, each time the valve clearance of each cylinder is adjusted, it is necessary to judge whether the corresponding crankshaft phase angle of each cylinder is within the continuous opening angle interval of the valve, so as to accurately judge whether the valve is open or closed, and then determine whether the valve clearance can be adjusted according to the opening and closing states of the valve. Compared with the prior art, this can avoid adjusting the valve intake when the valve is open and avoid errors in valve clearance adjustment. Especially for engines with a large number of cylinders, it can greatly avoid errors.

[0130] Among them, the first acquisition module is used to obtain the continuous opening angle interval of the valve. The continuous opening angle interval of the valve includes the continuous opening angle interval [α1, α2] of the intake valve and the continuous opening angle interval [α3, α4] of the exhaust valve. The second acquisition module is used to obtain the crankshaft phase angle Ai of each cylinder, where n is the number of cylinders. The first judgment and adjustment module is used to judge whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result. The third acquisition module is used to obtain the crankshaft phase angle Bi of each cylinder after the second engine rotation. The second judgment and adjustment module is used to judge whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle interval of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result. The statistical prompt module is used to record the number of times of valve clearance adjustment for the intake valve and the exhaust valve of each cylinder according to the judgment result. If the intake valve and the exhaust valve of each cylinder have both been adjusted at least once, the valve clearance adjustment process is exported; otherwise, an error is reported.

[0131] The first judgment and adjustment module includes a first judgment and adjustment unit and a second judgment and adjustment unit. Among them, the first judgment and adjustment unit is used to determine that the crankshaft phase angle Ai is within the continuous opening angle interval of the corresponding exhaust valve or the intake valve, then the valve clearance of the exhaust valve or the intake valve corresponding to the crankshaft phase angle Ai is not adjusted. The second judgment and adjustment unit is used to determine that the crankshaft phase angle Ai is not within the continuous opening angle interval of the corresponding intake valve or the corresponding exhaust valve, and judge the magnitude of the absolute value of each difference and the first preset angle. If the absolute value of each difference is greater than or equal to the first preset angle, the valve clearance is adjusted.

[0132] The second judgment and adjustment module includes a third judgment and adjustment unit and a fourth judgment and adjustment unit. Among them, the third judgment and adjustment unit is used to determine that the crankshaft phase angle Bi is within the continuous opening angle interval of the corresponding exhaust valve or the intake valve, then the valve clearance of the exhaust valve or the intake valve corresponding to the crankshaft phase angle Bi is not adjusted. The fourth judgment and adjustment unit is used to determine that the crankshaft phase angle Bi is not within the continuous opening angle interval of the corresponding intake valve or the corresponding exhaust valve, and judge the magnitude of the absolute value of each difference and the first preset angle. If the absolute value of each difference is greater than or equal to the first preset angle, the valve clearance is adjusted.

[0133] The vehicle includes a valve, a controller, and a memory. Among them, the valve, the controller, and the memory can be connected through a bus. The valve is used to input air into the engine and discharge the burned exhaust gas.

[0134] The memory, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the valve clearance adjustment process method in the embodiments of the present invention. The vehicle controller executes various functional applications and data processing of the vehicle by running the software programs, instructions, and modules stored in the memory, that is, implements the valve clearance adjustment process method in the above embodiments.

[0135] The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some instances, the memory may further include a memory remotely set relative to the controller, and these remote memories can be connected to the vehicle through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0136] The vehicle provided in the third embodiment of the present invention and the valve clearance adjustment process method provided in the above embodiment belong to the same inventive concept. Technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as those of the valve clearance adjustment process method.

[0137] The present invention also provides a storage medium, on which a computer program is stored. When the program is executed by the controller, the vehicle implements the valve clearance adjustment process method as described in the above embodiments of the present invention.

[0138] Of course, the computer-executable instructions of a storage medium containing computer-executable instructions provided in the embodiments of the present invention are not limited to the operations in the valve clearance adjustment process method as described above, and can also execute related operations in the valve clearance adjustment process method provided in the embodiments of the present invention, and have corresponding functions and beneficial effects.

[0139] Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software and necessary general hardware. Of course, it can also be implemented by hardware, but in many cases the former is a better implementation. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk or optical disc of a computer, etc., including several instructions to enable a computer device (which can be a robot, personal computer, server, or network device, etc.) to execute the clutch self-learning method described in each embodiment of the present invention.

[0140] In addition, the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. Valve clearance adjustment process method, characterized in that It includes the following steps: Obtain the continuous opening angle range of the valve. The continuous opening angle range of the valve includes the continuous opening angle range [α1, α2] of the intake valve and the continuous opening angle range [α3, α4] of the exhaust valve; After the first engine rotation, obtain the crankshaft phase angle Ai of each cylinder, where i = 1, 2, ……, n, and n is the number of cylinders; Judge whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle range of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result; After the second engine rotation, obtain the crankshaft phase angle Bi of each cylinder; Judge whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result; Record the number of times of valve clearance adjustment for the intake valve and the exhaust valve of each cylinder according to the judgment result; if the intake valve and the exhaust valve of each cylinder have both been adjusted at least once, then export the valve clearance adjustment process; otherwise, report an error; Judging whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle range of the valve, and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result includes: If the crankshaft phase angle Ai corresponding to the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, the exhaust valve corresponding to this crankshaft phase angle Ai is not adjusted; if the crankshaft phase angle Ai corresponding to the current cylinder is within the continuous opening angle range of the corresponding intake valve, the intake valve corresponding to this crankshaft phase angle Ai is not adjusted; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, then obtain the absolute values of the differences between the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the intake valve opening angle range, and judge the magnitude between each absolute value of the difference and the first preset angle. If each absolute value of the difference is greater than or equal to the first preset angle, then adjust the intake valve clearance; if the crankshaft phase angle Ai of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, then obtain the absolute values of the differences between the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the exhaust valve opening angle range, and judge the magnitude between each absolute value of the difference and the first preset angle. If each absolute value of the difference is greater than or equal to the first preset angle, then adjust the exhaust valve clearance; Wherein, the absolute values of the differences between the crankshaft phase angle Ai corresponding to the current cylinder and the two endpoints of the intake valve opening angle range are |Ai - α1| and |Ai - α2|; The absolute values of the differences between the crankshaft phase angle Ai and the two endpoints of the exhaust valve opening angle range corresponding to the current cylinder are |Ai - α3| and |Ai - α4|; Judging whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determining whether to adjust the valve clearance of the corresponding cylinder according to the judgment result includes: If the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding exhaust valve, the exhaust valve corresponding to the crankshaft phase angle Bi is not adjusted; if the crankshaft phase angle Bi corresponding to the current cylinder is within the continuous opening angle range of the corresponding intake valve, the intake valve corresponding to the crankshaft phase angle Bi is not adjusted; if the crankshaft phase angle Bi of the current cylinder is not within the continuous opening angle range of the corresponding intake valve, the absolute values of the differences between the crankshaft phase angle Bi corresponding to the current cylinder and the two endpoints of the intake valve opening angle range are obtained, and the magnitudes of the absolute values of the differences are judged against the first preset angle. If the absolute values of all the differences are greater than or equal to the first preset angle, the intake valve clearance is adjusted; if the crankshaft phase angle Bi of the current cylinder is not within the continuous opening angle range of the corresponding exhaust valve, the absolute values of the differences between the crankshaft phase angle Bi corresponding to the current cylinder and the two endpoints of the exhaust valve opening angle range are obtained, and the magnitudes of the absolute values of the differences are judged against the first preset angle. If the absolute values of all the differences are greater than or equal to the first preset angle, the exhaust valve clearance is adjusted; Among them, the absolute values of the differences between the crankshaft phase angle Bi corresponding to the current cylinder and the two endpoints of the intake valve opening angle range |Bi - α1| and |Bi - α2|; The absolute values of the differences between the crankshaft phase angle Bi and the two endpoints of the exhaust valve opening angle range corresponding to the current cylinder |Bi - α3| and |Bi - α4|; After the second crankshaft rotation, the crankshaft phase angles Bi of each cylinder obtained include: Obtain the crankshaft phase angle Ax of the x-th cylinder where neither the intake valve clearance nor the exhaust valve clearance has been adjusted. If Ax can be divided evenly by the second preset angle W, the x-th cylinder is the reference cylinder, and the angle by which the crankshaft needs to be rotated counterclockwise for the second crankshaft rotation is Ax; if Ai + Ax > 720°, then the crankshaft phase angles Bi of each cylinder = Ai + Ax - 720°; if Ai + Ax ≤ 720°, then the crankshaft phase angles Bi of each cylinder = Ai + Ax.

2. The valve clearance adjustment process method according to claim 1, characterized in that, Obtain the crankshaft phase angles Ai of each cylinder and the continuous opening angle ranges of the valves, including: Obtain the theoretical valve timing; According to the theoretical valve timing, calculate the angle α1 corresponding to the intake valve opening moment, the angle α2 corresponding to the intake valve closing moment, the angle α3 corresponding to the exhaust valve opening moment, and the angle α4 corresponding to the exhaust valve closing moment; Obtain the ignition sequence of the engine, and according to the ignition sequence of the engine, obtain the firing interval angle βi of the corresponding camshaft of each cylinder and the top dead center of compression of the reference cylinder. Based on the obtained firing interval angle βi of the corresponding camshaft of each cylinder, calculate the crankshaft phase angle Ai of each cylinder based on the reference cylinder as Ai = 720 - 2 * βi.

3. The valve clearance adjustment process method according to any one of claims 1-2, characterized in that The first preset angle is 720° / n.

4. The valve clearance adjustment process method according to any one of claims 1-2, characterized in that, The error reporting includes a screen pop-up window and a sound prompt.

5. Valve clearance adjustment process device, which adjusts the valve clearance by using the valve clearance adjustment process method described in any one of claims 1-4, characterized in that, Including: A first acquisition module for obtaining the continuous opening angle ranges of the valves. The continuous opening angle ranges of the valves include the continuous opening angle range [α1, α2] of the intake valve and the continuous opening angle range [α3, α4] of the exhaust valve; A second acquisition module for obtaining the crankshaft phase angles Ai of each cylinder after the first crankshaft rotation, where i = 1, 2,..., n, and n is the number of cylinders; The first judgment and adjustment module is used to judge whether the crankshaft phase angle Ai of each cylinder is within the continuous opening angle range of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result; The third acquisition module is used to obtain the crankshaft phase angle Bi of each cylinder after the second engine rotation; The second judgment and adjustment module is used to judge whether the crankshaft phase angle Bi of each cylinder is within the continuous opening angle range of the valve, and determine whether to adjust the valve clearance of the corresponding cylinder according to the judgment result; The statistics and prompt module is used to record the number of times of valve clearance adjustment for the intake valve and exhaust valve of each cylinder according to the judgment result. If the intake valve and exhaust valve of each cylinder have both been adjusted at least once, the valve clearance adjustment process is exported; otherwise, an error is reported.

6. A vehicle, characterized in that, including: The valve is used to input air into the engine and discharge the exhaust gas after combustion; The memory is used to store executable instructions; The controller is used to implement the valve clearance adjustment process method as described in any one of claims 1-4 when executing the executable instructions stored in the memory.

7. Storage medium, on which a computer program is stored, characterized in that, When the program is executed by the controller, the vehicle implements the valve clearance adjustment process method as described in any one of claims 1-4.

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