JP2017155663A - Vehicular control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular control system capable of preventing occurrence of gear noise at the time of shift operation in an automatic transmission.SOLUTION: An ECU 6, when a wet multiple disc clutch 3 is made into an interruption state, or when an N range is selected as a shift range of an AMT 4 with operation of a shift lever device 20, performs control such that a fuel injection amount from an injector 9 is adjusted so that a ratio of a detection value of an engine speed sensor 25 to detection values of wheel speed sensors 24A, 24B is within a preset range, the wheel speed sensors respectively installed on a pair of drive wheels 5A, 5B, and the engine speed sensor installed on a crank shaft 13 of a Diesel engine 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle control system, and more particularly to a vehicle control system capable of preventing the occurrence of gear ringing during a shift operation in an automatic transmission.

  In recent vehicles, it is common to mount an automatic transmission (AMT) that outputs rotational power input from an engine by increasing or decreasing the speed at a predetermined speed ratio. In this AMT, the target shift speed is determined based on preset map data indicating the relationship between the vehicle speed, the accelerator opening, and the gear speed (see, for example, Patent Document 1).

  When performing a shift operation to the target shift stage, an operation of connecting / disconnecting a clutch device interposed between the engine and the engine is performed before and after the shift operation. In the operation of returning the clutch device to the engaged state after the speed change operation, control for adjusting the engine speed is performed in order to prevent the occurrence of gear ringing due to the gear being forcibly connected. Specifically, the rotational speed of the output shaft that outputs rotational power from the AMT to the propeller shaft and the engine rotational speed are matched within a preset range.

  However, when the clutch device is disengaged, the torsional fluctuation caused by the release of the stress applied to the propeller shaft is applied to the output shaft. This affects the control related to the engine speed and causes the gear in the AMT. There is a problem that a ringing occurs. This problem also occurs in the gear-in operation when the shift range is selected from neutral to drive range in AMT.

JP 2014-163462 A

  An object of the present invention is to provide a vehicle control system capable of preventing the occurrence of gear ringing during a gear shifting operation in an automatic transmission.

  The vehicle control system of the present invention that achieves the above object connects and disconnects an automatic transmission that automatically selects a shift range in accordance with an operation of a shift lever, and a rotational power that is input from the engine to the automatic transmission. In a vehicle control system comprising a clutch device, a pair of drive wheels driven by the rotational power shifted by the automatic transmission, and a control means, the pair of drive wheels has a rotational speed of the drive wheels. Each of the wheel rotation sensors to be detected is installed, and the control means has the pair of wheel rotation sensors when the clutch device is in a disengaged state or when a neutral range is selected as the shift range of the automatic transmission. The engine is controlled so that the ratio of the engine speed to the detected value falls within a preset range.

  According to the vehicle control system of the present invention, since the engine speed at the time of a shift operation in the automatic transmission is controlled based on the rotation speed of the drive wheel, it is possible to prevent the occurrence of gear noise.

1 is a configuration diagram of a vehicle control system according to an embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle control system according to an embodiment of the present invention.

  The vehicle control system (hereinafter referred to as “control system”) includes a diesel engine 1 mounted on the vehicle, a torque converter 2 that is sequentially connected to the diesel engine 1, a wet multi-plate clutch 3, an automatic transmission (AMT). ) 4 and a pair of drive wheels 5A, 5B, and an ECU 6 as control means.

  In the engine body 7 of the diesel engine 1, the fuel accumulated in the common rail 8 passes into the compressed air in the plurality of cylinders 10 (four in this example) through the injector 9 whose injection amount and injection timing are controlled by the ECU 6. By being injected and combusted / expanded, the piston 11 is reciprocated in the cylinder 12 to rotationally drive the crankshaft 13. The increase or decrease of the engine speed of the diesel engine 1 is performed by adjusting the fuel injection amount from the injector 9.

  The torque converter 2 and the wet multi-plate clutch 3 transmit the rotational power of the crankshaft 13 of the diesel engine 1 to the AMT 4.

  The AMT 4 includes an input shaft 14 to which the rotational power from the wet multi-plate clutch 3 is input, an output shaft 15 that outputs the rotational power after shifting, and a subshaft disposed in parallel to the input shaft 14 and the output shaft 15. 16. The input main gear 17 attached to the input shaft 14 meshes with one of the sub gears 18 attached to the sub shaft 16, and the other sub gear 18 of the sub shaft 16 is connected to the output main gear 19 attached to the output shaft 15. , The rotational power of the input shaft 14 is transmitted to the output shaft 15 via the sub shaft 16. The gear ratio, which is the ratio of the rotational speed of the input shaft 14 and the rotational speed of the output shaft 15, is determined by the gear ratio of the input side main gear 17, the sub gear 18 and the output side main gear 19.

  In the AMT 4, the shift range is automatically selected in accordance with the operation of the shift lever device 20 that can select the shift positions of parking, reverse, neutral, and drive.

  When the driver selects the parking position, the parking range (P range) is selected in AMT4, and the drive system including the shaft and gears is fixed. When the reverse position is selected, the reverse range (R range) is selected and switching to the reverse gear (not shown) is performed. When the neutral position is selected, the neutral range (N range) is selected, and the drive system is freed by the gear release operation.

  When the driver selects a drive position, a drive range (D range) is selected in AMT5, and control for shifting to a target shift stage determined based on the driving state of the vehicle and preset map data is performed. Done. During this speed change operation, the wet multi-plate clutch 3 is disengaged and the diesel engine 1 and the AMT 4 are disconnected.

  Rotational power output from the output shaft 15 of the AMT 4 is transmitted through the propeller shaft 21, the differential 22, and the pair of axles 23A and 23B to rotationally drive the pair of drive wheels 5A and 5B, respectively.

  Wheel rotation sensors 24A and 24B for detecting the rotational speeds of the drive wheels 5A and 5B are respectively installed on the axles 23A and 23B of the pair of drive wheels 5A and 5B. An engine rotation sensor 25 that measures the engine speed is installed on the crankshaft 13 of the diesel engine 1. The pair of wheel rotation sensors 24 </ b> A and 24 </ b> B and the engine rotation sensor 25 are connected to the ECU 6 through signal lines (indicated by a one-dot chain line).

  In such a control system, the ECU 6 detects the detected value X of the pair of wheel rotation sensors 24A and 24B when the wet multi-plate clutch 3 is disengaged or when the N range is selected as the shift range of the AMT 4. The fuel injection amount from the injector 9 is adjusted to increase or decrease the engine speed of the diesel engine 1 so that the ratio (Y / X) of the detected value Y of the engine rotation sensor 25 to the engine is within a preset range. Take control. The preset range is preferably in the range of 0.9 to 1.1.

  By performing such control, the influence of torsional fluctuation applied from the propeller shaft 21 to the output shaft 15 is eliminated, so that it is possible to prevent the occurrence of gear squeal at the time of shifting operation in the AMT4.

  When the detection results of the pair of wheel rotation sensors 24A and 24B are different from each other, the average value, minimum value, or maximum value of both is used as the detection value X.

  The present invention is applied to all vehicles, but is particularly preferably applied to large vehicles such as trucks and buses in which the propeller shaft 21 becomes longer and the torsional fluctuation increases.

1 Diesel engine 3 Wet multi-plate clutch 4 AMT
5A, 5B Drive wheel 6 ECU
15 Output shaft 21 Propeller shaft 24A, 24B Wheel rotation sensor 25 Engine rotation sensor

Claims (2)

An automatic transmission that automatically selects a shift range according to an operation of a shift lever, a clutch device that connects and disconnects rotational power input from the engine to the automatic transmission, and the rotational power that is shifted by the automatic transmission In a vehicle control system comprising a pair of drive wheels driven by a control means and a control means,
A wheel rotation sensor that detects the number of rotations of the drive wheels is installed on each of the pair of drive wheels,
When the clutch device is in a disengaged state or when a neutral range is selected as the shift range of the automatic transmission, the control means is a ratio of the engine speed to the detection value of the pair of wheel rotation sensors. , Wherein the engine is controlled so as to be within a preset range.   The vehicle control system according to claim 1, wherein the preset range is a range of 0.9 to 1.1.

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