CN103122991B - Automobile automatic transmission two-gear control system - Google Patents

Abstract

In order to solve the problems of many gears and complicated operation in the automatic transmission control system of the prior art, the present invention proposes a two-gear control system for an automatic transmission of an automobile, which includes an automatic transmission computer control unit TCU, an automatic transmission, an accelerator pedal, a brake Pedal, shift handle, automatic transmission output shaft locking device, vehicle speed sensor and rotational speed sensor; the shift handle is equipped with forward gear D and reverse gear R, and a forced neutral parking switch is built into the shift handle; TCU according to The signals of the vehicle speed sensor, rotational speed sensor, gas pedal and brake pedal control the automatic transmission to be in different working states. The beneficial technical effect of the two-gear control system of the automobile automatic transmission of the present invention is that the number of gears of the shift handle is reduced, and the operation is simplified. There will be no misoperation, and the system has a high degree of automation. Moreover, the structure is simple, no major changes need to be made to the automatic transmission control system in the prior art, and it is easy to realize.

Description

Automobile automatic transmission two-gear control system

technical field

The invention relates to a control technology of an automatic transmission of an automobile, in particular to a two-gear control system of an automatic transmission of an automobile.

Background technique

The prior art automatic transmission usually uses the transmission output shaft to drive the transmission oil pump, and then the oil pressure output by the oil pump drives the clutch state of the transmission planetary gears to achieve the purpose of its speed change. When the speed of the transmission output shaft is high (that is, when the vehicle speed is high), the oil pressure output by the transmission oil pump is high, the system will turn on the control switch of the high-speed gear, and the system enters the working state of the high-speed gear; when the speed of the transmission output shaft is low When the vehicle speed is low (that is, when the vehicle speed is low), the oil pressure output by the transmission oil pump is low, the system will turn on the control switch of the low-speed gear, and the system will enter the low-speed gear working state. When the driving speed of the car is close to zero, or just starting from zero, the oil pressure output by the transmission oil pump driven by the transmission output shaft will be close to zero, and the transmission itself cannot position the gear in neutral, forward or park according to the oil pressure change. For the gear, only by manually controlling the shift handle of the transmission to drive a set of mechanical mechanisms to put the transmission in the required gear. Therefore, the prior art automatic transmission shift handle usually includes four gear positions such as D gear, N gear, P gear and R gear, wherein, D gear is a forward gear, N gear is a neutral gear, P gear is a parking gear, and R gear is a parking gear. The gear is reverse gear. In addition, the automatic transmission in the prior art uses the automatic transmission computer control unit TCU to control the operation of the automatic transmission, including the coordination between the shift handle and the system ignition and exercise, for example: only when the shift handle is in N gear or P gear, the engine can Ignition; after ignition, the vehicle must be switched from N or P to D or R to start the vehicle; when parking on a slope for a long time, it must be switched to P, otherwise the handbrake may be overloaded and the vehicle may slide down the slope cause an accident. Although it is already an automatic transmission, it is still complicated to operate in practice. Obviously, the automatic transmission control system in the prior art has problems such as many gears and complicated operation.

Contents of the invention

In order to solve the problems of many gears and complicated operation in the automatic transmission control system of the prior art, the present invention proposes a two-gear control system of an automatic transmission for automobiles. The two-gear control system of the automobile automatic transmission of the present invention comprises an automatic transmission computer control unit TCU, an automatic transmission, an accelerator pedal, a brake pedal, a shift handle, an automatic transmission output shaft locking device, a vehicle speed sensor and a rotational speed sensor; the shift handle is provided with Forward gear D and reverse gear R, and a forced neutral parking switch is built into the shift handle; TCU controls the automatic transmission in different working states according to the signals of the vehicle speed sensor, speed sensor, accelerator pedal and brake pedal, including:

When the car is parked, the TCU perceives that the speed of the vehicle speed sensor signal is close to zero; at the same time, the circuit of the brake pedal is in the connected state, that is, the driver is braking at this time, and the TCU controls the automatic transmission to disengage the gear and enter neutral gear; when the speed sensor signal When the engine speed is close to zero, the engine has been stopped and turned off, the TCU controls the output shaft locking device of the automatic transmission to enter the locked state, and the car enters parking;

When the car is started, the TCU senses that the circuit of the brake pedal is connected, and it will maintain the parking state. At the same time, according to the signal of the speed sensor, if the engine speed does not exceed 600rpm for several seconds, it will continue to maintain the parking state; when the speed sensor signals the engine speed If it is higher than 600rpm for a few seconds, the brake pedal circuit is disconnected, the accelerator pedal is connected, the TCU controls the automatic transmission output shaft locking device to enter the open state, and the TCU controls the automatic transmission to mount forward according to the position of the shift handle in D or R. gear or reverse gear;

When the car is running normally, the TCU perceives the signal of the vehicle speed sensor and controls the automatic transmission to enter the low-speed or high-speed working state according to the vehicle speed;

When the vehicle needs to be moved under special circumstances, the forced neutral parking switch built into the shift handle is turned on, the output shaft locking device of the automatic transmission enters the open state, the car enters the neutral state from the parking state, and the vehicle can be pushed or dragged.

The beneficial technical effect of the two-gear control system of the automobile automatic transmission of the present invention is that the number of gears of the shift handle is reduced, and the operation is simplified. There will be no misoperation, and the system has a high degree of automation. Moreover, the structure is simple, no major changes need to be made to the automatic transmission control system in the prior art, and it is easy to realize.

Description of drawings

Accompanying drawing 1 is the structural representation of the two-gear control system of the automobile automatic transmission of the present invention.

The two-gear control system of the automobile automatic transmission of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Detailed ways

Accompanying drawing 1 is the structural representation of two-gear control system of automobile automatic transmission of the present invention, among the figure, 1 is automatic transmission computer control unit TCU, 2 is automatic transmission, 3 is accelerator pedal, 4 is brake pedal, 5 is shift handle , 6 is the automatic transmission output shaft locking device, 7 is the vehicle speed sensor, and 8 is the rotational speed sensor. As can be seen from the figure, the automobile automatic transmission two-gear control system of the present invention comprises an automatic transmission computer control unit TCU, an automatic transmission, an accelerator pedal, a brake pedal, a shift handle, an automatic transmission output shaft locking device, a vehicle speed sensor and a rotational speed sensor; The gear handle is provided with forward gear D gear and reverse gear R gear, and a forced neutral switch is built into the gear shift handle; TCU controls the automatic transmission in different gears according to the signals of the vehicle speed sensor, rotational speed sensor, accelerator pedal, brake pedal and gear shift handle. working status, including:

When the car is parked, the TCU perceives that the speed of the vehicle speed sensor signal is close to zero; at the same time, the circuit of the brake pedal is in the connected state, that is, the driver is braking at this time, and the TCU controls the automatic transmission to disengage the gear and enter neutral gear; when the speed sensor signal When the engine speed is close to zero, the engine has been stopped and turned off, the TCU controls the output shaft locking device of the automatic transmission to enter the locked state, and the car enters parking;

When the car is started, the TCU senses that the circuit of the brake pedal is connected, and it will maintain the parking state. At the same time, according to the signal of the speed sensor, if the engine speed does not exceed 600rpm for several seconds, it will continue to maintain the parking state; when the speed sensor signals the engine speed If it is higher than 600rpm for a few seconds, the brake pedal circuit is disconnected, the accelerator pedal is connected, the TCU controls the automatic transmission output shaft locking device to enter the open state, and the TCU controls the automatic transmission to mount forward according to the position of the shift handle in D or R. gear or reverse gear;

When the car is running normally, the TCU perceives the signal of the vehicle speed sensor and controls the automatic transmission to enter the low-speed or high-speed working state according to the vehicle speed;

When the vehicle needs to be moved under special circumstances, the forced neutral switch built into the shift handle is turned on, the output shaft locking device of the automatic transmission enters the open state, the car enters the neutral state from the parking state, and the vehicle can be pushed or dragged.

The two-gear control system of the automobile automatic transmission of the present invention changes the gears of the shift handle of the automatic transmission from four gears D, N, P and R to two gears D and R, so that the driving of the automatic transmission is more intelligent . At the same time, when the vehicle is parked, the vehicle can be parked without any operation on the shift handle, and the automatic transmission output shaft locking device can be automatically controlled to enter the locked state to ensure that the vehicle is in a safe and reliable state. When the vehicle starts, just put the shift handle in the required D or R gear, and the system will automatically enter the required forward or reverse state. In addition, the two-gear control system of the automobile automatic transmission of the present invention can be implemented only by making a small amount of changes to the automatic transmission control system of the prior art.

Apparently, the beneficial technical effect of the two-gear control system of the automobile automatic transmission of the present invention is that the number of gears of the shift handle is reduced, and the operation is simplified. There will be no misoperation, and the system has a high degree of automation. Moreover, the structure is simple, no major changes need to be made to the automatic transmission control system in the prior art, and it is easy to realize.

Claims (1)

1. an automatic gearbox two shift control system, is characterized in that: this system comprises automatic transmission computer control unit TCU, automatic transmission, gas pedal, braking pedal, shift handle, automatic transmission output shaft Locking Device, vehicle speed sensor and speed probe; Shift handle is only provided with forward gear D and keeps off and reverse gear shift R keeps off, and in shift handle, inserts pressure neutral to park switch; TCU is in different working staties according to the SC sigmal control automatic transmission of vehicle speed sensor, speed probe, gas pedal and braking pedal, comprising:

When automobile parking, TCU perception vehicle speed sensor signal shows that the speed of a motor vehicle is close to zero; The loop of braking pedal is in on-state simultaneously, and namely now driver brakes, and TCU controls automatic transmission and throws off gear, enters neutral; When signals of rotational speed sensor shows that engine speed is close to zero, then motor switch-off, TCU controls automatic transmission output shaft Locking Device and enters lockup state, and automobile enters parks;

When automobile starting, the loop of TCU perception braking pedal for being communicated with, then keeps state of parking, and simultaneously according to signals of rotational speed sensor, if the non-last for several seconds of engine speed is higher than more than 600rpm, then continues maintenance and to park state; When signals of rotational speed sensor shows that engine speed last for several seconds is higher than 600rpm, braking pedal loop disconnects, gas pedal is UNICOM, TCU controls automatic transmission output shaft Locking Device and enters opening state, TCU is D gear or R gear according to shift handle position, controls automatic transmission and puts into forward gear or reverse gear shift;

When automobile normal running, TCU perception vehicle speed sensor signal controls automatic transmission according to the speed of a motor vehicle and enters low speed or high speed operation state;

When needing moving vehicle in special circumstances, open in shift handle the pressure neutral inserted and to park switch, automatic transmission output shaft Locking Device enters opening state, and automobile enters neutral position state by the state of parking, and vehicle can be pushed or drag.