CN104442816B - A kind of constant speed cruising system controller and its control method - Google Patents

Abstract

The invention provides a low-cost, high-safety cruise control system controller and a control method thereof. The constant-speed cruise system controller of the present invention combines the vehicle-mounted standard components and commonly used control and sensor signals, and through the control chip, after the cruise switch is turned on, the electronic accelerator pedal signal is limited to the accelerator pedal signal adapted to the cruise vehicle speed. Send it to the ECU of the whole vehicle, so that the maximum speed of the vehicle can be controlled by simulating the stroke of the accelerator pedal to complete the constant speed cruise; when the invention is applied, it is not necessary to disassemble and modify the structure of the component body, and only need to modify the corresponding wiring harness, adding a small amount of control and The display device is easy to be refitted on existing models with a large number of vehicles and pre-installed by the vehicle factory, which can save a lot of cost; the invention can also physically disconnect the circuit connection when an accident or failure occurs in the system, which is very safe and reliable.

Description

A cruise control system controller and its control method

technical field

The invention relates to the technical field of automotive electronics, in particular to a constant-speed cruise system controller and a control method thereof.

Background technique

With the increasing popularization and widespread use of automobiles, the comfort, convenience and safety of automobiles have become more and more concerned by users. Many users want to maintain a maximum speed close to the limit on the highway, but they don't want to have unfavorable factors such as violations and fines introduced by the speed exceeding the limit when they don't care. In the process of long-distance driving at high speed, keeping the accelerator at a certain position and fine-tuning the accelerator according to the ups and downs of the road, ups and downs, etc., will cause the user's right foot to be rested for a long time, which is not conducive to the user's driving experience .

For this reason, the cruise control system has become an important configuration when the user chooses a vehicle. However, due to the complexity of the traditional cruise control, which involves direct throttle control, high safety level, and strict requirements on the control module, the cost is high and the Mainly used in automatic transmission models.

According to the current proportion of vehicle sales, most vehicles in China are manual transmission models, and the cruise control function is very low in manual transmission models. How to improve the demand for cruise and similar functions of manual transmission models and solve the problem of manual transmission models? The actual demand in the field of cruising technology has become an urgent problem to be solved.

In the current technical category, the commonly used method of cruising speed limit is to directly intervene in the fuel injection quantity, and limit the increase of vehicle speed by controlling the fuel injection quantity, so as to achieve comprehensive effects such as fuel saving and constant speed. However, this method is difficult to implement and expensive to use.

Contents of the invention

The primary purpose of the present invention is to propose a low-cost, high-safety cruise control system controller.

According to the cruise control system controller provided by the present invention, the key is to include a power supply module and a control chip, and the input of the control chip includes at least an electronic accelerator pedal signal, a vehicle speed signal, a brake switch signal, a cruise switch, and a cruise vehicle speed input; The electronic accelerator pedal signal, the input of the control chip, the output of the control chip, and the electronic accelerator pedal signal interface of the vehicle ECU are connected through a relay; when the cruise switch controls the relay to open and close, the electronic accelerator pedal signal has two directions: direct connection The electronic accelerator pedal signal interface of the vehicle ECU/or connect to the input of the control chip, and the output of the control chip is connected to the electronic accelerator pedal signal interface of the vehicle ECU; the coil power supply of the relay is connected to the brake switch to enable the brake to be turned on , the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU.

The constant-speed cruise system controller of the present invention combines the vehicle-mounted standard parts and common control and sensor signals, and through the control chip, after the cruise switch is turned on, the electronic accelerator pedal signal is limited to the accelerator pedal signal adapted to the cruise vehicle speed and then Send it to the ECU of the whole vehicle, so that the maximum speed of the vehicle can be controlled by simulating the stroke of the accelerator pedal to complete the constant speed cruise; when the invention is applied, it is not necessary to disassemble and modify the structure of the component body, only to modify the corresponding wiring harness, and add a small amount of control and The display device is easy to be refitted on existing models with a large number of vehicles and pre-installed by the vehicle factory, which can save a lot of cost; the invention can also physically disconnect the circuit connection when the system has an accident or failure, which is very safe and reliable.

Further, the input of the control chip also includes the engine speed signal and the clutch switch signal. The current vehicle speed judgment of the control chip can also include the judgment based on the engine speed signal to ensure the accuracy of the current vehicle speed; the switch basis of the control chip can also increase the clutch switch signal. When the user steps on the clutch, the control chip exits the cruise mode to increase safety. sex.

Further, the control chip is also connected with the cruise display module to facilitate man-machine communication.

Further, the control chip is also provided with a CAN bus interface, and the current vehicle speed information can be obtained through the CAN bus.

Another object of the present invention is to provide the control method of above-mentioned cruise control controller, comprising the following steps:

A. The user turns on the cruise switch and enters the cruise speed, the relay is closed, the signal of the electronic accelerator pedal connected to the ECU is interrupted, and the signal of the electronic accelerator pedal is connected to the input of the control chip of the cruise controller;

B. The control chip judges the current vehicle speed according to the real-time input accelerator pedal signal and vehicle speed signal. If the current vehicle speed does not reach the set cruising speed, it will directly output the electronic accelerator pedal signal to the ECU; if the vehicle speed approaches/reaches the set cruise speed Cruising speed, the electronic accelerator pedal signal is processed, the electronic accelerator pedal signal value is limited, and then the limited electronic accelerator pedal signal value is continuously sent to the ECU to realize constant speed cruise;

C. When the control chip detects the brake switch signal, the control chip disconnects the relay, the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU, and the cruise control is exited; the brake switch is turned on, and the coil power of the relay is turned on. Cut off to ensure that the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU to ensure exit from cruise control.

According to the control method of the constant speed cruise controller of the present invention, before the vehicle speed approaches/reaches the cruising speed, the user experience is the same as when the constant speed cruising is not started, and when the vehicle speed approaches/reaches the cruising speed, the constant speed cruise controller The control chip limits the signal value of the electronic accelerator pedal, and continuously sends the limited signal value of the electronic accelerator pedal to the ECU to keep the vehicle at the set cruising speed. After the user depresses the brake pedal, it can be controlled simultaneously through software and physical methods. Guaranteed exit cruise, which improves the user's driving experience from the perspective of comfort, convenience and safety.

Further, the step C also includes the step: when the control chip detects the clutch signal, the control chip disconnects the relay, the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU, and the cruise control is exited to further Improve security.

Further, the determination of the current vehicle speed in the step B also includes the determination based on the engine speed signal, so as to improve the accuracy of the determination of the current vehicle speed.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the present invention.

detailed description

Below with reference to the accompanying drawings, through the description of the implementation examples, the specific embodiments of the present invention, such as the shape, structure, mutual position and connection relationship between each part, the role and working principle of each part, etc., will be further described. detailed instructions.

Example 1:

As shown in Fig. 1, the cruise control system controller of the present invention includes a power supply module and a control chip, and the input of the control chip includes at least an electronic accelerator pedal signal, a vehicle speed signal, a brake switch signal, a cruise switch and a cruise vehicle speed input; the electronic accelerator pedal The signal, control input, output of the control chip, and the electronic accelerator pedal signal interface of the vehicle ECU are connected through a relay; when the cruise switch control relay is opened and closed, the electronic accelerator pedal signal has two directions: directly connected to the electronic accelerator pedal of the vehicle ECU The signal interface/or connect the input of the control chip, and the output of the control chip is connected to the electronic accelerator pedal signal interface of the vehicle ECU; the coil power supply of the relay is connected to the brake switch, so that when the brake is turned on, the electronic accelerator pedal signal is directly connected to the whole vehicle. Electronic accelerator pedal signal interface of vehicle ECU. The input of the control chip also includes the engine speed signal and the clutch switch signal. The control chip is also connected with the cruise display module to facilitate man-machine communication.

The constant-speed cruise system controller of the present invention combines the vehicle-mounted standard parts and common control and sensor signals, and through the control chip, after the cruise switch is turned on, the electronic accelerator pedal signal is limited to the accelerator pedal signal adapted to the cruise vehicle speed and then Send it to the ECU of the whole vehicle, so that the maximum speed of the vehicle can be controlled by simulating the stroke of the accelerator pedal to complete the constant speed cruise; when the invention is applied, it is not necessary to disassemble and modify the structure of the component body, only to modify the corresponding wiring harness, and add a small amount of control and The display device is easy to be refitted on existing models with a large number of vehicles and pre-installed by the vehicle factory, which can save a lot of cost; the invention can also physically disconnect the circuit connection when the system has an accident or failure, which is very safe and reliable.

The present invention also provides the control method of the above constant speed cruise controller, comprising the following steps:

A. The user turns on the cruise switch and enters the cruise speed, the relay is closed, the signal of the electronic accelerator pedal connected to the ECU is interrupted, and the signal of the electronic accelerator pedal is connected to the input of the control chip of the cruise controller;

B. The control chip judges the current vehicle speed according to the real-time input accelerator pedal signal and vehicle speed signal. If the current vehicle speed does not reach the set cruising speed, it will directly output the electronic accelerator pedal signal to the ECU; if the vehicle speed approaches/reaches the set cruise speed Cruising speed, the electronic accelerator pedal signal is processed, the electronic accelerator pedal signal value is limited, and then the limited electronic accelerator pedal signal value is continuously sent to the ECU to realize constant speed cruise;

C. When the control chip detects the brake switch signal, the control chip disconnects the relay, the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU, and the cruise control is exited; the brake switch is turned on, and the coil power of the relay is turned on. Cut off to ensure that the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU to ensure exit from cruise control.

Wherein, the determination of the current vehicle speed in step B also includes the determination based on the engine speed signal, so as to improve the accuracy of the determination of the current vehicle speed. Step C also includes the step of: when the control chip detects the clutch signal, the control chip disconnects the relay, the electronic accelerator pedal signal is directly connected to the electronic accelerator pedal signal interface of the vehicle ECU, and the cruise control is exited to further improve safety.

According to the control method of the constant speed cruise controller of the present invention, before the vehicle speed approaches/reaches the cruising speed, the user experience is the same as when the constant speed cruising is not started, and when the vehicle speed approaches/reaches the cruising speed, the constant speed cruise controller The control chip limits the signal value of the electronic accelerator pedal, and continuously sends the limited signal value of the electronic accelerator pedal to the ECU to keep the vehicle at the set cruising speed. After the user depresses the brake pedal, it can be controlled simultaneously through software and physical methods. Guaranteed exit cruise, which improves the user's driving experience from the perspective of comfort, convenience and safety.

Claims (7)

1. a kind of constant speed cruising system controller, it is characterised in that including power module and control chip, the control chip Input at least includes efp signal, GES, brake switch signal, cruise switch and cruise speed input； Also include relay, the input of the relay is connected with efp signal, the output end difference of the relay It is connected with the input of the control chip and vehicle ECU efp signaling interface, the output of the control chip End is connected with vehicle ECU efp signaling interface；During the cruise switch control relay folding, E-Gas is stepped on Partitioned signal has two-way whereabouts：It is directly connected to vehicle ECU efp signaling interface or connects the input of control chip, The output of control chip reconnects vehicle ECU efp signaling interface；The coil power of the relay and braking Switch connection, during so that braking being opened, the efp signal is directly connected to vehicle ECU efp signal Interface.

2. constant speed cruising system controller according to claim 1, it is characterised in that the input of the control chip is also wrapped Include engine rotational speed signal and clutch switch signal.

3. constant speed cruising system controller according to claim 1, it is characterised in that the control chip is also aobvious with cruise Show that module is connected.

4. constant speed cruising system controller according to claim 1, it is characterised in that it is total that the control chip is additionally provided with CAN Line interface.

5. the control method of constant speed cruising system controller according to claim 1, it is characterised in that comprise the following steps：

A, user open cruise switch and input cruise speed, relay adhesive, and efp connection ECU signal is by It is disconnected, the input of the control chip of efp signal connection cruise control；

B, control chip are judged current vehicle speed according to the accelerator pedal signal and GES that input in real time, if current vehicle The cruise speed of speed not up to setting, then directly by efp signal output to ECU；If speed approach/reaches setting Cruise speed, then efp signal is handled, limit efp signal value, then by the limitation electricity Electronic throttle pedal signal value is persistently sent to ECU, realizes cruise；

C, detect brake switch signal when control chip, then control chip disconnects relay, and efp signal is direct Vehicle ECU efp signaling interface is connected, cruise is exited；Brake switch is opened, by the coil electricity of relay Source is cut off, it is ensured that efp signal is directly connected to vehicle ECU efp signaling interface, it is ensured that exit constant speed Cruise.

6. the control method of constant speed cruising system controller according to claim 5, it is characterised in that the step C is also wrapped Include step：When control chip detects clutch engagement signal, then control chip disconnects relay, and efp signal is direct Vehicle ECU efp signaling interface is connected, cruise is exited.

7. the control method of constant speed cruising system controller according to claim 5, it is characterised in that the step B is current Speed judges also to include the judgement according to engine rotational speed signal.