DE102015207924A1 - Start-stop control system for vehicle engine and its control method - Google Patents

Abstract

The invention relates to a start-stop control system for vehicle engines, comprising: an information acquisition module having a first information detection sub-module for detecting a wheel speed, a second information detection sub-module for detecting a gear position of an automatic transmission, and a third information detection sub-module for detecting a position of a brake device; a judging module for judging whether the wheel speed is zero, whether the gear position of the automatic transmission is in NEUTRAL or PARKEN, and whether the brake device is in the brake position; an execution module for controlling the stop or the start of the engine depending on the judgment result of the judgment module. In the vehicle engine start-stop control system according to the present invention, a specific automatic transmission is saved as compared with the existing automatic engine start-stop technology, enabling the use of the automatic engine start-stop technology in the low-end market and the oil-saving one Behavior of low-end vehicles improved significantly.

Description

Technical area

In the invention is a vehicle area with an automatic transmission. In particular, the invention relates to a start-stop control system for vehicle engine of such a vehicle and its control method.

State of the art

The automatic start-stop function of the engine in the prior art can provide the vehicle with an excellent oil-saving effect. Thus, it is widely used in the vehicle field worldwide.

In the vehicle having the automatic transmission, the oil pressure for opening the clutch is currently frequently provided by a pump connected to an internal combustion engine. But at standstill of the vehicle, the oil pressure can not be generated, it is then impossible for the clutch remains in an open state. In order to enable the automatic start-stop function of the engine in the vehicle with the automatic transmission, special electric oil pump or accumulator must be provided for this purpose, namely a special automatic transmission are designed. When the vehicle is equipped with the special automatic transmission, the engine may start and stop at idle, that is, when engine stop is required, the automatic transmission is brought into DRIVE, and thereafter the brake device is stepped until the engine stops, and when subsequently the engine start is needed, the brake device can be easily solved. This solution concept causes additional and expensive hardware costs of the vehicle in which the solution concept is used. Therefore, the automatic start-stop function of the vehicle transmission having the automatic transmission can be used only in the high-end market.

On the young market of the vehicle (eg China) on the one hand the middle-low-end models are popular with ordinary automatic transmissions, on the other hand the users of these models also hope that by using the automatic engine start-stop function the oil consumption can be saved can. At the same time, this contributes to environmental improvement. Therefore, there is a demand that the engine start-stop function be applied to the middle-low-end models having the ordinary automatic transmissions.

Disclosure of the invention

The object of the invention can be seen to provide a start-stop control system for vehicle engine and its control method, which system and method can also realize the engine start-stop function in a vehicle with a conventional automatic transmission.

According to one aspect of the invention, there is provided a start-stop control system for a vehicle engine, comprising: an information acquisition module including a first information detecting sub-module for detecting a wheel speed, a second information-detecting sub-module for detecting a gear position of an automatic transmission, and a third information-detecting sub-module for detecting a position of a Has braking device; a judging module for judging whether the wheel speed is zero, whether the gear position of the automatic transmission is in NEUTRAL or PARKEN, and whether the brake device is in the brake position; an execution module for controlling the stop or the start of the engine depending on the judgment result from the judgment module.

Alternatively, it is possible that the execution module is then used to control the stop of the engine when the wheel speed is zero and the automatic transmission is in NEUTRAL or PARKEN.

Alternatively, it is possible that the execution module is then used to control the start of the engine when the brake device is in a non-braking position and the automatic transmission is in NEUTRAL.

Alternatively, it is possible that the information acquisition module further comprises a fourth information acquisition sub-module for detecting a key ignition signal; that the execution module is then used to control the start of the engine when the brake device is in the non-braking position, the automatic transmission is in PARKEN and the key ignition signal is detected.

Alternatively, it is possible for the information acquisition module to further include a fifth information acquisition sub-module for detecting the parameter affecting the safety stop of the vehicle; that the judging module is further used to judge whether the parameter detected by the fifth information detecting sub-module affects the safety stop of the vehicle; in that the execution module is further used to control the stop of the motor depending on the judgment results of the judging module.

Alternatively, it is possible that the parameters detected by the fifth information acquisition sub-module include battery state, door state, and engine temperature; that the assessment module is further used to judge whether the remaining battery level is sufficient for restarting the engine, whether the door is closed, and whether the engine reaches an engine warm-up temperature; that the execution module then controls the stop of the engine when the wheel speed is zero, the automatic transmission is in NEUTRAL or in PARKEN, the remaining battery level is sufficient for restarting the engine, the door is closed and the engine reaches the engine warm-up temperature.

According to another aspect of the invention, there is further provided an engine start-stop control method of a vehicle engine start-stop control system, comprising:
Stop step 1, detecting the wheel speed;
Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero;
Stop step 3, controlling the stopping of the engine when it is judged that the automatic transmission is in NEUTRAL or in PARKEN;
and or
Starting step 1, detecting the gear position of the automatic transmission;
Starting step 2, detecting the position of the brake device when it is judged that the automatic transmission is in NEUTRAL;
Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position.

Alternatively, it is possible that before the starting step 1, there is also a starting step 4, shifting the automatic transmission from PARKING to NEUTRAL when the automatic transmission detected at the stopping step 3 is in PARKING.

Alternatively, it is possible to have a stop step 4 before the stop step 3, to detect the battery state, the door state, and the engine temperature; and that the stopping step 3 comprises controlling the stop of the engine when it is judged that the automatic transmission is in NEUTRAL or PARK, the battery is sufficient for restarting the engine, the door is closed, and the engine reaches the engine warm-up temperature.

According to another aspect of the invention, there is further provided an engine start-stop control method of a vehicle engine start-stop control system, comprising
Stop step 1, detecting the wheel speed;
Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero;
Stopping step 3, controlling the stop of the engine when it is judged that the automatic transmission is in PARKING;
and or
Starting step 1, detecting the key firing signal;
Starting step 2, detecting the position of the brake device when the key ignition signal is detected;
Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position.

The start-stop control system according to the invention for vehicle engine and its control method have the advantage: on the one hand, in the middle-low-end models with ordinary automatic transmissions from the prior art by arranging this control system and using the corresponding control method, the engine start-stop To be applied to such models, thus greatly expanding the scope of the engine's automatic start-stop function and greatly increasing the applicable models, while providing excellent oil-saving performance without many additional hardware costs. On the other hand, the invention also provides a new alternative start-stop control system for vehicles having a prior art automatic transmission already provided with engine start-stop function (for example, for vehicles additionally equipped with a special electric oil pump or accumulator) Vehicle engine and its control method provided such that, in the event of a failure of the particular electric oil pump or accumulator of these vehicles, the engine also alternately through the use of the engine start-stop control system according to the invention and its engine start-stop method can be realized, so that the reliability of these high-end models is further increased. The vehicle according to the invention is provided with a start-stop control system according to the invention, which can realize the automatic engine start-stop function cost-effectively using a corresponding control method and increase the oil-saving effect of such a vehicle.

Brief description of the drawings

1 is a schematic representation of a start-stop control system according to the invention for vehicle engine;

2 Fig. 10 is a flowchart of the vehicle engine start-stop control method according to the present invention;

3 is a flowchart in which a control method according to the invention corresponds to the operations of the driver; such as

4 is a flowchart in which another inventive control method corresponds to the operations of the driver.

embodiments

1 shows a schematic representation of a start-stop control system according to the invention for vehicle engine. This system comprises an information acquisition module, a judgment module, and an execution module, the information acquisition module having a first information acquisition sub-module for detecting a wheel speed, a second information acquisition sub-module for detecting a gear position of an automatic transmission, and a third information acquisition sub-module for detecting a position of a brake device. After the above-mentioned information acquisition sub-modules have acquired the respective information, the information can be transferred to the evaluation module simultaneously or successively. The assessment module is to analyze the detected information and judge whether the wheel speed is zero, whether the gear position of the automatic transmission is in NEUTRAL or PARKEN and whether the brake device is in the braking position. After that, these judgment results are transmitted from the judging module to the execution module, and the execution module is to control the stopping or starting of the engine depending on the results transmitted by the judging module.

Specifically, in one embodiment of the invention, the execution module controls the stop of the engine when it is judged by the assessment module that the wheel speed is zero and the automatic transmission is in NEUTRAL or PARKEN; and the execution module controls the start of the engine when it is judged by the judging module that the brake device is in a non-braking state and the automatic transmission is in NEUTRAL.

In general, an automatic restart of the engine is only possible if the automatic transmission is in NEUTRAL. To further increase the applicability of the invention, in one embodiment of the invention, the information acquisition module preferably further comprises a fourth information acquisition sub-module for detecting a key firing signal. When the judging module judges that the brake device is in the non-braking state, and the automatic transmission is in PARKEN and possibly the key firing signal detected by the fourth information detection sub-module is still present, the execution module may also be used to control the starting of the engine. Such a configuration results in the control of the automatic starting of the engine being realized also in PARKING of the automatic transmission, which complements the method of the invention and allows it to be used well.

It is preferable that taking into consideration the safety of the vehicle stop, the information acquisition module in an embodiment of the present invention further comprises a fifth information acquisition sub-module for detecting the parameters affecting the safety stop of the vehicle. It is so provided that the judging module is further used upon completion of the engine stop operation to judge whether the parameter detected by the fifth information detecting sub-module affects the safety stop of the vehicle. Only if the information reflected by these parameters does not lead to the appearance of the vehicle safety risk can the standstill operation of other engines be continued. In this embodiment, the execution module will only control the engine stop, only if it is judged that the remaining battery level for restarting the engine is sufficient, the door already is closed and the engine has reached the engine warm-up temperature and the other engine shutdown requirements are met. It should be noted that the security information parameters involved in this invention are not limited to those listed above. These parameters may also include whether a vehicle air conditioner is closed or not, whether an accelerator pedal is in the pressed state or not, and so on.

Due to the above start-stop control system for vehicle engine, according to the present invention, a new start-stop technology for vehicle engine is provided. By designing the control system for middle and low end models, such vehicles, on the one hand due to a conventional automatic transmission, can realize an automatic start-stop function of the engine without providing it with a specific automatic transmission, thereby reducing the scope of the automatic start-stop technique of the engine is expanded on the one hand; the cost of the originally required hardware (specific automatic transmission) on the other hand are still saved and in a large number of vehicle models fuel economy is realized. For high-end models that already have specific automatic transmissions, the invention provides again an alternative possibility for an automatic start and stop of an engine. If the specific components in the specific automatic transmission of the vehicle (such as special electric oil pump or pressure accumulator), an error occurs, with the help of this system, the automatic start-stop of an engine can be realized and the reliability of the high-end models can be further increased ,

2 shows a flowchart for the inventive engine start-stop control method of a vehicle. By using the control system according to the invention, this control method can be carried out, this method comprising the following steps:
Stop step 1, detecting the wheel speed;
Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero;
Stop step 3, controlling the stopping of the engine when it is judged that the automatic transmission is in NEUTRAL or in PARKEN;
and or
Starting step 1, detecting the gear position of the automatic transmission;
Starting step 2, detecting the position of the brake device when it is judged that the automatic transmission is in NEUTRAL;
Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position.

Here, after performing the operation of stopping the engine and with improved traffic, the starting of the engine may be immediately performed when it is judged in the stopping step 3 that the automatic transmission is in NEUTRAL. If it is judged in the stopping step 3 that the automatic transmission is in NEUTRAL, before the starting step 1, this control method may further include a starting step 4 in which the automatic transmission switches from PARKING to NEUTRAL. Subsequently, starting step 1, starting step 2 and starting step 3 are carried out in sequence. After the above engine start operation is completed, the automatic switches to DRIVE and the vehicle can drive normally.

Alternatively, taking into account the safety before the stopping step 3, there may be a stopping step 4: detecting the battery condition, the door condition and the engine temperature. Here, the stop step 3 includes controlling the stop of the engine when it is judged that the automatic transmission is in NEUTRAL or in PARKEN, the remaining battery level is sufficient for restarting the engine, the door is closed, and the engine reaches the engine warm-up temperature. This ensures better safety during the engine start-stop process.

It should be noted that the detection of these parameters does not serve as a basis for detecting other parameters, nor does it have to be based on results relating to other parameters. Therefore, the time required to acquire these parameters should not necessarily be limited to before or after detecting the wheel speed or detecting the gear position of the automatic transmission as soon as these parameters are detected and judged before the control module issues an engine start-stop command ,

It should be noted that the start method or the stop method may operate separately in this embodiment.

According to another embodiment of the invention, the invention provides another start-stop control method for vehicle engines comprising the steps of:
Stop step 1, detecting the wheel speed;
Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero;
Stopping step 3, controlling the stop of the engine when it is judged that the automatic transmission is in PARKING;
and or
Starting step 1, detecting the key firing signal;
Starting step 2, detecting the position of the brake device when the key ignition signal is detected;
Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position.

In the vehicle engine start-stop control system proposed in the invention, the engine can not be automatically started when the automatic transmission is in PARKEN. Therefore, the engine must be started in other ways, for example by ignition by key in this embodiment, or by first switching the automatic transmission of PARKEN in NEUTRAL and then further start-up steps to start the engine are performed, as explained in the last embodiment.

It is noteworthy that the start method or the stop method may operate separately in this embodiment.

By the above-mentioned control method, the invention allows the vehicles on the one hand only with a normal automatic transmission (namely no special component for engine start-stop, for example, no special electric oil pump or pressure accumulator are added) at temporarily halting the engine's automatic start-stop function without hardware improvement on the vehicle's existing automatic transmission, effectively improving the oil-saving effect at no high hardware cost, and greatly extending the application's automatic start-stop function and the applicable models will be greatly increased. In the case of a vehicle with a sespecific automatic transmission, the invention has again proposed an alternative solution for realizing the engine start-stop. If an error occurs in the specific components in the specific automatic transmission of the vehicle, the engine start-stop method provided by the invention can start and stop a compressor to effect the fuel-saving effect.

3 and 4 show a flowchart in which the control method according to the invention corresponds to the operations of the driver.

In the according to 3 As shown in the flow chart, the driver may step on the braking device until the vehicle stops completely, and the driver maintains this low pressure when the vehicle hits the red light during normal driving. At this moment, the judging module judges that the wheel speed detected by the first information detecting sub-module is zero, and the parameters affecting the safety stop of the vehicle detected by the fifth information detecting sub-module all satisfy the start-stop requirements. After that, the driver switches the DRIVE automatic transmission to NEUTRAL, and at that moment, the judging module judges that the automatic transmission detected by the second information detecting sub-module is in NEUTRAL; in response to the above judgment results given by the judging module, the control module controls the engine stop. In this case, the brake device must be stepped steadily, so that it is always in braking position, so that the engine stops. After these operations have been completed, the driver can stop the vehicle and wait until the traffic light turns green and passage is allowed. Since no gear shift takes place during this process, the judging module judges at this moment that the automatic transmission detected by the second information detecting sub-module is in NEUTRAL, so the driver can directly release the brake device. At this moment, the judging module judges that the brake device detected by the third information detecting sub-module is in the non-braking state, and in response to the above judgment results given by the judging module, the control module controls the engine start. After that, the automatic transmission is switched by the driver from NEUTRAL to DRIVE, so that the vehicle starts with normal driving.

If the vehicle is in traffic jam during normal driving, the traffic jam often consumes much longer time than Rotampel. In this case, the in 4 shown embodiment are used. First, the driver can depress the braking device until the vehicle stops completely and the driver maintains this low pressure. At this moment, the judging module judges that the wheel speed detected by the first information detecting sub-module is zero, and the parameters affecting the safety stop of the vehicle detected by the fifth information detecting sub-module all satisfy the start-stop requirements. Thereafter, the driver switches the automatic transmission from DRIVE to PARKEN, and at that moment the evaluation module judges that the automatic transmission detected by the second information detection sub-module is in PARKEN; in response to the above judgment results given by the judging module, the control module controls the engine stop. In this case, the brake device must be stepped steadily, so that it is always in braking position, so that the engine stops. After these operations have been completed, the driver can stop the vehicle and wait until the traffic situation improves. At this moment, since no gear change takes place during this process, the judging module judges that the automatic transmission detected by the second information detecting sub-module is in PARKEN. If the automatic transmission is in PARK, the engine can not be automatically started by a direct release of the brake device, so the vehicle key can be used for ignition. At this moment, the fourth information detecting sub-module detects the key firing signal, and then the driver releases the braking device, and the judging module judges that the braking device detected by the third information acquiring module is in a non-braking state. Thus, the control module controls the engine start in response to the above judgment results given by the judgment module. After that, the automatic transmission is switched by the driver from NEUTRAL to DRIVE, so that the vehicle starts with normal driving.

It should be noted that the embodiments mentioned in the invention do not necessarily have to be applied to some special situations mentioned in the invention (for example red light or traffic congestion). In any situation where the engine start-stop function is needed, this procedure can be used.

In the above text, the embodiments of the invention with reference to figures are specified. The person skilled in the art can, according to the above description, equivalently modify or vary the detailed features in the embodiments. Undoubtedly, these modified embodiments are also included within the scope of the claims.

Claims (10)

A start-stop control system for a vehicle engine, characterized by comprising: an information acquisition module including a first information detection sub-module for detecting a wheel speed, a second information-detecting sub-module for detecting a gear position of an automatic transmission, a third information-detecting sub-module for detecting a position of a brake device; a judging module for judging whether the wheel speed is zero, whether the gear position of the automatic transmission is in NEUTRAL or PARKEN, and whether the brake device is in the brake position; an execution module for controlling the stop or the start of the engine depending on the judgment result of the judgment module. A start-stop control system for vehicle engine according to claim 1, characterized in that the execution module is then used to control the stop of the engine when the wheel speed is zero and the automatic transmission is in NEUTRAL or PARKEN. A start-stop control system for vehicle engine according to claim 1 or 2, characterized in that the execution module is then used to control the start of the engine, when the brake device is in a non-braking position and the automatic transmission is in NEUTRAL. The vehicle engine start-stop control system according to claim 1 or 2, characterized in that the information acquisition module further comprises a fourth information detection sub-module for detecting a key ignition signal; that the execution module is then used to control the start of the engine when the brake device is in the non-braking position, the automatic transmission is in PARKEN and the key ignition signal is detected. The start-stop control system for vehicle engine according to any one of claims 1 to 4, characterized in that the information acquisition module further comprises a fifth information detection sub-module for detecting the parameter affecting the safety stop of the vehicle; that the judging module is further used to judge whether the parameter detected by the fifth information detecting sub-module affects the safety stop of the vehicle; in that the execution module is further used to control the stop of the motor depending on the judgment results of the judging module. A vehicle engine start-stop control system according to claim 5, characterized in that said parameters detected by said fifth information acquisition sub-module include battery condition, door condition, and engine temperature; that the assessment module is further used to judge whether the remaining battery level is sufficient for restarting the engine, whether the door is closed, and whether the engine reaches an engine warm-up temperature; that the execution module then controls the stop of the engine when the wheel speed is zero, the automatic transmission is in NEUTRAL or in PARKEN, the remaining battery level is sufficient for restarting the engine, the door is closed and the engine reaches the engine warm-up temperature. An engine start-stop control method of a vehicle engine start-stop control system, characterized by comprising, stop step 1, detecting the wheel speed; Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero; Stop step 3, controlling the stopping of the engine when it is judged that the automatic transmission is in NEUTRAL or in PARKEN; and / or starting step 1, detecting the gear position of the automatic transmission; Starting step 2, detecting the position of the brake device when it is judged that the automatic transmission is in NEUTRAL; Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position. Engine start-stop control method according to claim 7, characterized in that before the starting step 1 further comprises a starting step 4, switching the automatic PARKEN in NEUTRAL when the detected in the stop step 3 automatic transmission is in PARKING. An engine start-stop control method according to claim 7 or 8, characterized in that before the stopping step 3, there is further provided a stopping step 4, detecting the battery condition, the door condition and the engine temperature; and that the stopping step 3 includes that the stop of the motor is controlled when it is judged that the Automatic transmission is in NEUTRAL or in PARKEN, the remaining battery level is sufficient for restarting the engine, the door is closed and the engine reaches the engine warm-up temperature. An engine start-stop control method of a vehicle engine start-stop control system, characterized by comprising, stop step 1, detecting the wheel speed; Stop step 2, detecting the gear position of the automatic transmission when it is judged that the wheel speed is zero; Stopping step 3, controlling the stop of the engine when it is judged that the automatic transmission is in PARKING; and / or starting step 1, detecting the key firing signal; Starting step 2, detecting the position of the brake device when the key ignition signal is detected; Starting step 3, controlling the start of the engine when it is judged that the brake device is in a non-braking position.

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