JPS59117944A - Automatic speed change control system - Google Patents

Abstract

PURPOSE:To prevent constitutional parts from being uselessly worn and improve comfortable driving and safety, by deciding the condition of a gradient by a gradient meter provided in a car and controlling the speed of the car not to be automatically changed by the opening of an accelerator. CONSTITUTION:A selector sensor detects a selector position set by a driver, and a required degree of acceleration intended by the driver is detected by an accelerator opening sensor. Further a car speed sensor detects a car speed and a gradient sensor GRDM detects the gradient of a car. Placing the selector of an automatic speed changer in a position D (drive range), if the car is started and accelerated on an ascending slope, an automatic speed change control part CONT decides a set position of the selector, and if the position is in the range D, it is decided whether or not the next gradient is existing. Then if a gradient is existing, the condition of the gradient is decided by a result observing the condition for a fixed time. If the gradient is decided to be continued further with a small accelerator opening and applying brake operation unless it is a stopped condition, the condition is recognized such that an accelerator pedal is temporarily released to adjust a speed, and switching of a speed change gear is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION When the driver depresses the accelerator pedal to start the vehicle from a certain state, the accelerator opening degree corresponding to the depressing state is detected and the vehicle is accelerated. When the vehicle finishes accelerating and reaches the desired vehicle speed, and you release the accelerator pedal, the control unit detects that the accelerator opening has become smaller, and the automatic transmission mechanism sequentially shifts to a higher gear that can maintain the vehicle speed, even if the acceleration force is weak. In automobiles that do not have an automatic gear shifting function, the driver must manually shift gears. In gear shifting operations that do not have this automatic shifting function, the driver steps on the accelerator pedal to switch to the first gear to start the vehicle, so the driver steps on the cranometer pedal, operates the shift lever to change gears, and then returns the clutch pedal to its original position. . This means that from the moment you step on the cradle/chipetal to change gears until the time you switch gears and return the clasochipetal to its original position, your speed will not accelerate, but rather your speed will drop. Particularly when going uphill, the drop in speed is significant, and this is compounded by differences in the driving skills of the drivers. If you start a car with an automatic gear shift function after a car that does not have an automatic gear shift function in such a state, you will press the accelerator pedal, and if the speed of the car that started in front of you decreases during the acceleration, the accelerator pedal will be released. This will cause you to slow down. The conventional automatic transmission mechanism then determines that no further acceleration is necessary and switches to a gear with weaker acceleration for the first hour. Meanwhile, when the car in front of you finishes changing gears and starts accelerating again, the car with an automatic transmission mechanism also tries to accelerate by stepping on the accelerator pedal again. However, at this time, the automatic transmission mechanism has already switched to a gear with a weak acceleration force, so the desired acceleration force cannot be obtained as it is, so the automatic transmission mechanism has to switch to a gear with a strong acceleration force. When the desired vehicle speed is reached, judged by the degree of opening of the accelerator pedal, the driver will switch again to a gear with weaker acceleration. On the other hand, if you start an automatic transmission with an automatic transmission function on a downhill slope, you will not press the accelerator pedal deeply after the first start, so the automatic transmission mechanism will immediately switch to the low acceleration mode. However, since it is a downhill slope, a gear with weak acceleration force will have weak engine braking effect and the vehicle speed will increase, so we solved this problem by using an inclinometer and will explain it in detail. FIG. 1 shows an embodiment of the system diagram of the automatic transmission function according to the present invention. (, ' is an air cleaner, TRM is transminosilane, GRDAi is an inclinometer, and 5PDAi is a speedometer.

C0NT is an automatic shift control section.

The selector center sensor detects the selector position set by the driver, and the accelerator opening sensor detects the degree of acceleration desired by the driver.

Furthermore, the vehicle speed sensor detects the vehicle speed, and the slope sensor detects the tendency of the vehicle, and the information detected by all sensors is sent to the automatic shift control section (L'UNT).First, we will explain starting on an uphill slope as an example. When the automatic transmission selector is set to D (dry prend) and the vehicle is started and accelerated on an uphill slope, the automatic transmission control unit C'08'T determines the set selector position, and if it is a D wrench, it will shift to the next slope. If there is a slope, the result of monitoring for a certain period of time is to determine whether the slope is a momentary condition such as a step that often occurs during road construction, or a continuous condition such as a slope. Judge by.

Then, if it is determined that the slope is continuing, and the accelerator opening is small and the brake is not applied and the vehicle is stopped, it is determined that the speed has been adjusted by temporarily loosening the accelerator pedal, and the transmission gear change is stopped. do. Similarly, in the case of starting on a downhill slope, the slope is determined after one start, and the gear shift is not changed depending on the accelerator opening. A series of determination operations of such automatic shift control section CONT are shown in the flowchart of FIG. The technology of the present invention can also be applied when a normal high-speed car 12 is driving and you approach a downhill slope, and you switch the selector to a low-speed wrench and use the engine brake to adjust the speed with the brake pedal. Then it will look like this: The automatic gear shift control unit (2001VT) determines that the vehicle is approaching a downhill slope during high-speed driving based on the detection results of each sensor, and also determines the duration of brake operation, the number of operations within a certain period of time, and the tendency for vehicle speed adjustment. By feeding the detected information to the automatic transmission control unit CUNT, it is possible to shift down the gears of the automatic transmission and bring out the effect of the engine brake, which prevents brake wear etc., resulting in safer driving. You can get an automatic shift function that allows you to pay attention, prevent unnecessary wear on component parts, and achieve the effects of comfortable driving and improved safety.

[Brief explanation of the drawing]

Fig. 1 is an automatic transmission function system diagram according to an embodiment of the present invention;
The same figure is a flowchart diagram showing a series of determination operations of the automatic shift control section. A RC・・・Air cleaner TRM・・・Transmission G RD M・
・・Inclination angle meter S P D Al ・・Vehicle speed meter C' 0 # T-・・Automatic shift control section 1st section

Claims (1)

[Claims] 1. An inclinometer is installed in a vehicle that has an automatic gear shift function that automatically changes gears by recognizing the accelerator opening degree by the driver's accelerator operation, the vehicle speed, and the power color output capacity, etc. It has a control function that provides timing, follows short-term changes, and does not automatically shift to a high-speed gear even if the accelerator opening is small on a slope with a slope.
? Automatic gear shift control system.